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83.6c0 6.5 4.6 14.4 17.3 12.1C428.2 457.8 496 362.9 496 252C496 113.3 383.5 8 244.8 8M97.2 352.9c-1.3 1-1 3.3.7 5.2c1.6 1.6 3.9 2.3 5.2 1c1.3-1 1-3.3-.7-5.2c-1.6-1.6-3.9-2.3-5.2-1m-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9c1.6 1 3.6.7 4.3-.7c.7-1.3-.3-2.9-2.3-3.9c-2-.6-3.6-.3-4.3.7m32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2c2.3 2.3 5.2 2.6 6.5 1c1.3-1.3.7-4.3-1.3-6.2c-2.2-2.3-5.2-2.6-6.5-1m-11.4-14.7c-1.6 1-1.6 3.6 0 5.9s4.3 3.3 5.6 2.3c1.6-1.3 1.6-3.9 0-6.2c-1.4-2.3-4-3.3-5.6-2\"\u002F>",{"left":4,"top":4,"width":24,"height":16,"rotate":4,"vFlip":6,"hFlip":6,"body":25},448,"\u003Cpath fill=\"currentColor\" d=\"M416 32H31.9C14.3 32 0 46.5 0 64.3v383.4C0 465.5 14.3 480 31.9 480H416c17.6 0 32-14.5 32-32.3V64.3c0-17.8-14.4-32.3-32-32.3M135.4 416H69V202.2h66.5V416zm-33.2-243c-21.3 0-38.5-17.3-38.5-38.5S80.9 96 102.2 96c21.2 0 38.5 17.3 38.5 38.5c0 21.3-17.2 38.5-38.5 38.5m282.1 243h-66.4V312c0-24.8-.5-56.7-34.5-56.7c-34.6 0-39.9 27-39.9 54.9V416h-66.4V202.2h63.7v29.2h.9c8.9-16.8 30.6-34.5 62.9-34.5c67.2 0 79.7 44.3 79.7 101.9z\"\u002F>",{"left":4,"top":4,"width":27,"height":16,"rotate":4,"vFlip":6,"hFlip":6,"body":28},384,"\u003Cpath fill=\"currentColor\" d=\"M290.7 311L95 269.7L86.8 309l195.7 41zm51-87L188.2 95.7l-25.5 30.8l153.5 128.3zm-31.2 39.7L129.2 179l-16.7 36.5L293.7 300zM262 32l-32 24l119.3 160.3l32-24zm20.5 328h-200v39.7h200zm39.7 80H42.7V320h-40v160h359.5V320h-40z\"\u002F>",{"left":4,"top":4,"width":5,"height":5,"rotate":4,"vFlip":6,"hFlip":6,"body":30},"\u003Cpath fill=\"currentColor\" d=\"M5.202 2.857C7.954 4.922 10.913 9.11 12 11.358c1.087-2.247 4.046-6.436 6.798-8.501C20.783 1.366 24 .213 24 3.883c0 .732-.42 6.156-.667 7.037c-.856 3.061-3.978 3.842-6.755 3.37c4.854.826 6.089 3.562 3.422 6.299c-5.065 5.196-7.28-1.304-7.847-2.97c-.104-.305-.152-.448-.153-.327c0-.121-.05.022-.153.327c-.568 1.666-2.782 8.166-7.847 2.97c-2.667-2.737-1.432-5.473 3.422-6.3c-2.777.473-5.899-.308-6.755-3.369C.42 10.04 0 4.615 0 3.883c0-3.67 3.217-2.517 5.202-1.026\"\u002F>",{"left":4,"top":4,"width":24,"height":16,"rotate":4,"vFlip":6,"hFlip":6,"body":32},"\u003Cpath fill=\"currentColor\" d=\"M433 179.11c0-97.2-63.71-125.7-63.71-125.7c-62.52-28.7-228.56-28.4-290.48 0c0 0-63.72 28.5-63.72 125.7c0 115.7-6.6 259.4 105.63 289.1c40.51 10.7 75.32 13 103.33 11.4c50.81-2.8 79.32-18.1 79.32-18.1l-1.7-36.9s-36.31 11.4-77.12 10.1c-40.41-1.4-83-4.4-89.63-54a102.5 102.5 0 0 1-.9-13.9c85.63 20.9 158.65 9.1 178.75 6.7c56.12-6.7 105-41.3 111.23-72.9c9.8-49.8 9-121.5 9-121.5m-75.12 125.2h-46.63v-114.2c0-49.7-64-51.6-64 6.9v62.5h-46.33V197c0-58.5-64-56.6-64-6.9v114.2H90.19c0-122.1-5.2-147.9 18.41-175c25.9-28.9 79.82-30.8 103.83 6.1l11.6 19.5l11.6-19.5c24.11-37.1 78.12-34.8 103.83-6.1c23.71 27.3 18.4 53 18.4 175z\"\u002F>",{"left":4,"top":4,"width":16,"height":16,"rotate":4,"vFlip":6,"hFlip":6,"body":34},"\u003Cpath fill=\"currentColor\" d=\"M464 64H48C21.49 64 0 85.49 0 112v288c0 26.51 21.49 48 48 48h416c26.51 0 48-21.49 48-48V112c0-26.51-21.49-48-48-48m0 48v40.805c-22.422 18.259-58.168 46.651-134.587 106.49c-16.841 13.247-50.201 45.072-73.413 44.701c-23.208.375-56.579-31.459-73.413-44.701C106.18 199.465 70.425 171.067 48 152.805V112zM48 400V214.398c22.914 18.251 55.409 43.862 104.938 82.646c21.857 17.205 60.134 55.186 103.062 54.955c42.717.231 80.509-37.199 103.053-54.947c49.528-38.783 82.032-64.401 104.947-82.653V400z\"\u002F>",{"left":4,"top":4,"width":24,"height":16,"rotate":4,"vFlip":6,"hFlip":6,"body":36},"\u003Cpath fill=\"currentColor\" d=\"M128.081 415.959c0 35.369-28.672 64.041-64.041 64.041S0 451.328 0 415.959s28.672-64.041 64.041-64.041s64.04 28.673 64.04 64.041m175.66 47.25c-8.354-154.6-132.185-278.587-286.95-286.95C7.656 175.765 0 183.105 0 192.253v48.069c0 8.415 6.49 15.472 14.887 16.018c111.832 7.284 201.473 96.702 208.772 208.772c.547 8.397 7.604 14.887 16.018 14.887h48.069c9.149.001 16.489-7.655 15.995-16.79m144.249.288C439.596 229.677 251.465 40.445 16.503 32.01C7.473 31.686 0 38.981 0 48.016v48.068c0 8.625 6.835 15.645 15.453 15.999c191.179 7.839 344.627 161.316 352.465 352.465c.353 8.618 7.373 15.453 15.999 15.453h48.068c9.034-.001 16.329-7.474 16.005-16.504\"\u002F>",{"id":38,"title":39,"author":40,"body":41,"comments":393,"date":567,"dateModified":568,"description":569,"extension":570,"headings":571,"heroImage":577,"meta":578,"path":579,"permalink":579,"published":580,"stem":581,"tags":582,"timeToRead":589},"posts\u002Fposts\u002F2017\u002Fasp-net-core-caching-in-practice\u002Findex.md","ASP.NET Core Caching in Practice","Muhammad Rehan Saeed",{"type":42,"value":43,"toc":390},"minimark",[44,69,84,93,100,111,114,124,127,132,135,147,156,161,164,202,222,229,234,237,248,256,281,302,305,316,330,333,336,357,363,374,386],[45,46,48,68],"h1",{"id":47},"cache-control-http-header",[49,50,53],"anchor-link",{"href":51,"label":52},"#cache-control-http-header","Link to this section",[54,55,62],"svg",{"xmlns":56,"xmlns:xlink":57,"viewBox":58,"version":59,"width":60,"height":60,"aria-hidden":61},"http:\u002F\u002Fwww.w3.org\u002F2000\u002Fsvg","http:\u002F\u002Fwww.w3.org\u002F1999\u002Fxlink","0 0 16 16","1.1",22,"true",[63,64],"path",{"fill":65,"fill-rule":66,"d":67},"currentColor","evenodd","M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z","Cache-Control HTTP Header",[70,71,72,73,83],"p",{},"The ",[74,75,82],"a",{"href":76,"rel":77,"target":81},"https:\u002F\u002Fdevelopers.google.com\u002Fweb\u002Ffundamentals\u002Fperformance\u002Foptimizing-content-efficiency\u002Fhttp-caching",[78,79,80],"nofollow","noopener","noreferrer","_blank","Cache-Control"," HTTP header can be used to set how long your resource can be cached for. However, the problem with this HTTP header is that you need to be able to predict the future and know before hand when the cache will become invalid. For some use cases, like writing an API where someone could change the resource at any time that's just not feasible.",[70,85,86,87,92],{},"I recommend you read the response caching middleware ",[74,88,91],{"href":89,"rel":90,"target":81},"https:\u002F\u002Fdocs.microsoft.com\u002Fen-us\u002Faspnet\u002Fcore\u002Fperformance\u002Fcaching\u002Fmiddleware",[78,79,80],"documentation",", it's not necessary as I do a quick overview next but the knowledge below builds upon it. The simple way to set the cache control header is directly on the action method like so:",[94,95],"pre",{"className":96,"language":97,"meta":98,"style":98,"html":99},"language-cs shiki shiki-themes light-plus monokai","cs","","\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">[\u003C\u002Fspan>\u003Cspan class=\"sw29p\">HttpGet\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">, \u003C\u002Fspan>\u003Cspan class=\"sw29p\">ResponseCache\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">Duration\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"s0PsH\"> 3600\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">, \u003C\u002Fspan>\u003Cspan class=\"sFrd5\">Location\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> ResponseCacheLocation\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">Any\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">)]\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">public\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> IActionResult\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> GetCats\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">()\n\u003C\u002Fspan>\u003C\u002Fspan>",[70,101,102,103,107,108,110],{},"Adding the ",[104,105,106],"code",{},"ResponseCache"," attribute just adds the ",[104,109,82],{}," HTTP header but does not actually cache the response on the server. To do that you also need to add the response caching middleware like so:",[94,112],{"className":96,"language":97,"meta":98,"style":98,"html":113},"\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">public\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> void\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> Configure\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sw29p\">IApplicationBuilder\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> application\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">) \u003C\u002Fspan>\u003Cspan class=\"snCLD\">=>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">    application\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">UseResponseCaching\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">().\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">UseMvc\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>",[70,115,116,117,119,120,123],{},"Instead of hard coding all of your cache settings in the ",[104,118,106],{}," attribute, it's possible to store them in the ",[104,121,122],{},"appsettings.json"," configuration file. To do so, you need to use a feature called cache profiles which look like this:",[94,125],{"className":96,"language":97,"meta":98,"style":98,"html":126},"\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">[\u003C\u002Fspan>\u003Cspan class=\"sw29p\">HttpGet\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">, \u003C\u002Fspan>\u003Cspan class=\"sw29p\">ResponseCache\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">CacheProfile\u003C\u002Fspan>\u003Cspan class=\"snCLD\">=\u003C\u002Fspan>\u003Cspan class=\"swiDo\">\"Cache1Hour\"\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">)]\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">public\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> IActionResult\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> GetCats\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">()\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">public class Startup\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">{    \n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">    private\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> readonly\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> IConfiguration\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> configuration\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">    \n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sw29p\">    public\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> Startup\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">() \u003C\u002Fspan>\u003Cspan class=\"snCLD\">=>\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">configuration\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> configuration\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">    public\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> void\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> ConfigureServices\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sw29p\">IServiceCollection\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> services\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">) \u003C\u002Fspan>\u003Cspan class=\"snCLD\">=>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">        services\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">            .\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Configure\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sw29p\">Dictionary\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">, \u003C\u002Fspan>\u003Cspan class=\"sw29p\">CacheProfile\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">>>(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">configuration\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">GetSection\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"swiDo\">\"CacheProfiles\"\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">))\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">            .\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">AddMvc\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">options\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">            {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s1q82\">                \u002F\u002F Read cache profiles from appsettings.json configuration file\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s4J9F\">                var\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> cacheProfiles\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">configuration\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">GetSection\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sw29p\">Dictionary\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">string\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">, \u003C\u002Fspan>\u003Cspan class=\"sw29p\">CacheProfile\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">>>();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"smL5M\">                foreach\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"> (\u003C\u002Fspan>\u003Cspan class=\"s4J9F\">var\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> keyValuePair\u003C\u002Fspan>\u003Cspan class=\"smL5M\"> in\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> cacheProfiles\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">)\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">                {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">                    options\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">CacheProfiles\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Add\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">keyValuePair\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">);\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">                }\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">            });\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">            \n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s1q82\">    \u002F\u002F Omitted\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">}\n\u003C\u002Fspan>\u003C\u002Fspan>",[94,128],{"className":129,"language":130,"meta":98,"style":98,"html":131},"language-json shiki shiki-themes light-plus monokai","json","\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">{\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"svrZB\">  \"CacheProfiles\"\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">: {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"svrZB\">    \"Cache1Hour\"\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">: {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"svrZB\">      \"Duration\"\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">: \u003C\u002Fspan>\u003Cspan class=\"s0PsH\">3600\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">,\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"svrZB\">     \"Location\"\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">: \u003C\u002Fspan>\u003Cspan class=\"syaXe\">\"Any\"\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">    }\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">  },\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s1q82\">  \u002F\u002F Omitted...\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">}\n\u003C\u002Fspan>\u003C\u002Fspan>",[70,133,134],{},"Now all your caching can be configured from a single configuration file.",[136,137,139,146],"h2",{"id":138},"cache-control-immutable-directive",[49,140,142],{"href":141,"label":52},"#cache-control-immutable-directive",[54,143,144],{"xmlns":56,"xmlns:xlink":57,"viewBox":58,"version":59,"width":60,"height":60,"aria-hidden":61},[63,145],{"fill":65,"fill-rule":66,"d":67},"Cache-Control Immutable Directive",[70,148,149,151,152,155],{},[104,150,82],{}," also has a new draft directive called ",[104,153,154],{},"immutable",". When you add this to the HTTP header value, you are basically telling the client that this resource never changes even if it has expired. You might be asking, why do we need this? Well, it turns out that when you refresh a page in a browser, it goes off to the server and checks to see if the resource has expired or not.",[94,157],{"className":158,"language":159,"meta":98,"style":98,"html":160},"language-http shiki shiki-themes light-plus monokai","http","\u003Cspan class=\"line\">\u003Cspan class=\"sjbfc\">Cache-Control\u003C\u002Fspan>\u003Cspan class=\"sJvqV\">:\u003C\u002Fspan>\u003Cspan class=\"swiDo\"> max-age=365000000, immutable\n\u003C\u002Fspan>\u003C\u002Fspan>",[70,162,163],{},"It turns out that you get a massive reduction in requests to your server by implementing this directive. Read more about it in these links:",[165,166,167,175,182,188,195],"ul",{},[168,169,170],"li",{},[74,171,174],{"href":172,"rel":173,"target":81},"https:\u002F\u002Ftools.ietf.org\u002Fhtml\u002Fdraft-mcmanus-immutable-00",[78,79,80],"IETF Draft Spec",[168,176,177],{},[74,178,181],{"href":179,"rel":180,"target":81},"https:\u002F\u002Fhacks.mozilla.org\u002F2017\u002F01\u002Fusing-immutable-caching-to-speed-up-the-web\u002F",[78,79,80],"Using Immutable Caching To Speed Up The Web",[168,183,184],{},[74,185,82],{"href":186,"rel":187,"target":81},"https:\u002F\u002Fdeveloper.mozilla.org\u002Fen-US\u002Fdocs\u002FWeb\u002FHTTP\u002FHeaders\u002FCache-Control",[78,79,80],[168,189,190],{},[74,191,194],{"href":192,"rel":193,"target":81},"https:\u002F\u002Fbitsup.blogspot.co.uk\u002F2016\u002F05\u002Fcache-control-immutable.html",[78,79,80],"Cache-Control: immutable",[168,196,197],{},[74,198,201],{"href":199,"rel":200,"target":81},"https:\u002F\u002Fcode.facebook.com\u002Fposts\u002F557147474482256",[78,79,80],"This browser tweak saved 60% of requests to Facebook",[70,203,204,205,210,211,215,216,218,219,221],{},"This directive has not yet been implemented in ASP.NET Core but I've raised an issue on GitHub ",[74,206,209],{"href":207,"rel":208,"target":81},"https:\u002F\u002Fgithub.com\u002Faspnet\u002FHttpAbstractions\u002Fissues\u002F763",[78,79,80],"here"," and there is also another issue ",[74,212,209],{"href":213,"rel":214,"target":81},"https:\u002F\u002Fgithub.com\u002Faspnet\u002FResponseCaching\u002Fissues\u002F97",[78,79,80]," to add the immutable directive to the static files middleware. If you really wanted to, it's really easy to add this directive today, as you just need to append the word ",[104,217,154],{}," onto the end of your ",[104,220,82],{}," HTTP header.",[70,223,224,225,228],{},"A word of warning! You need to make sure that your resource really never changes. You can do this in Razor by using the ",[104,226,227],{},"asp-append-version"," attribute on your script tags:",[94,230],{"className":231,"language":232,"meta":98,"style":98,"html":233},"language-html shiki shiki-themes light-plus monokai","html","\u003Cspan class=\"line\">\u003Cspan class=\"sNflI\"><\u003C\u002Fspan>\u003Cspan class=\"sjbfc\">script\u003C\u002Fspan>\u003Cspan class=\"snDo4\"> src\u003C\u002Fspan>\u003Cspan class=\"sfK3G\">=\u003C\u002Fspan>\u003Cspan class=\"squEy\">\"~\u002Fsite.js\"\u003C\u002Fspan>\u003Cspan class=\"snDo4\"> asp-append-version\u003C\u002Fspan>\u003Cspan class=\"sfK3G\">=\u003C\u002Fspan>\u003Cspan class=\"squEy\">\"true\"\u003C\u002Fspan>\u003Cspan class=\"sNflI\">><\u002F\u003C\u002Fspan>\u003Cspan class=\"sjbfc\">script\u003C\u002Fspan>\u003Cspan class=\"sNflI\">>\n\u003C\u002Fspan>\u003C\u002Fspan>",[70,235,236],{},"This will append a query string to the link to site.js which will contain a hash of the contents of the file. Each time the file changes, the hash is changed and thus you can safely mark the resource as immutable.",[45,238,240,247],{"id":239},"e-tags",[49,241,243],{"href":242,"label":52},"#e-tags",[54,244,245],{"xmlns":56,"xmlns:xlink":57,"viewBox":58,"version":59,"width":60,"height":60,"aria-hidden":61},[63,246],{"fill":65,"fill-rule":66,"d":67},"E-Tags",[70,249,250,255],{},[74,251,254],{"href":252,"rel":253,"target":81},"https:\u002F\u002Fen.wikipedia.org\u002Fwiki\u002FHTTP_ETag",[78,79,80],"E-tags"," are typically generated in three ways (Read the link to understand what they are):",[257,258,259,272,278],"ol",{},[168,260,261,262,265,266,271],{},"Hashing the HTTP response body - You'd want to use a very fast and collision resistant hash function like MD5 (MD5 is broken security wise and you should never use it but it's ok to use it for caching). Unfortunately, this method is slow because you have to load the entire response body into memory (which is not the default in ASP.NET Core which streams it straight to the client for better performance) to hash it. If you're still interested in implementing this ",[104,263,264],{},"E-Tag","'s using this method ",[74,267,270],{"href":268,"rel":269,"target":81},"https:\u002F\u002Fmadskristensen.net\u002Fpost\u002Fsend-etag-headers-in-aspnet-core",[78,79,80],"Mads Kristensen"," wrote a nice blog post showing how it can be done.",[168,273,274,275,277],{},"Last modification timestamp - The ",[104,276,264],{}," can literally be the time the object was last modified which you can store in your database (I usually store created and modified timestamps for anything I store in a database anyway). This solves the performance problem above but now what is the difference between doing this and using the Last Modified HTTP header?",[168,279,280],{},"Revision Number - This could be some kind of integer stored in the database which gets incremented each time the data is modified. I don't see any advantage of doing this over using the last modification timestamp above, unless you have a naturally occurring revision number in your data that you could use.",[70,282,283,284,287,288,291,292,295,296,298,299,301],{},"One additional thing you need to be careful of is the ",[104,285,286],{},"Accept",", ",[104,289,290],{},"Accept-Encoding"," and ",[104,293,294],{},"Accept-Language"," HTTP headers. Any time you send a different response based on these HTTP headers, your ",[104,297,264],{}," needs to be different e.g. a JSON non-gzip'ed response in Mandarin needs to have a different ",[104,300,264],{}," to an XML gzip'ed response in Urdu.",[70,303,304],{},"For option one, this can be achieved by calculating the hash after the response body has gone through GZIP compression. For the second and third options, you would need to append the value of the Accept HTTP headers to the last modified date or revision number and then hash all of that.",[45,306,308,315],{"id":307},"last-modified--if-modified-since",[49,309,311],{"href":310,"label":52},"#last-modified--if-modified-since",[54,312,313],{"xmlns":56,"xmlns:xlink":57,"viewBox":58,"version":59,"width":60,"height":60,"aria-hidden":61},[63,314],{"fill":65,"fill-rule":66,"d":67},"Last-Modified & If-Modified-Since",[70,317,318,319,291,324,329],{},"I'm assuming you already know about the ",[74,320,323],{"href":321,"rel":322,"target":81},"https:\u002F\u002Fdeveloper.mozilla.org\u002Fen-US\u002Fdocs\u002FWeb\u002FHTTP\u002FHeaders\u002FLast-Modified",[78,79,80],"Last-Modified",[74,325,328],{"href":326,"rel":327,"target":81},"https:\u002F\u002Fdeveloper.mozilla.org\u002Fen-US\u002Fdocs\u002FWeb\u002FHTTP\u002FHeaders\u002FIf-Modified-Since",[78,79,80],"If-Modified-Since"," HTTP headers. If not, go ahead and read the links. Below is an example controller and action method that returns a list of cats.",[94,331],{"className":96,"language":97,"meta":98,"style":98,"html":332},"\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">[\u003C\u002Fspan>\u003Cspan class=\"sw29p\">Route\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"swiDo\">\"[controller]\"\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">)]\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">public\u003C\u002Fspan>\u003Cspan class=\"s4J9F\"> class\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> CatsController\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"> : \u003C\u002Fspan>\u003Cspan class=\"sw29p\">ControllerBase\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">{\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">    private\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> readonly\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> ICatRepository\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> catRepository\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">    private\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> readonly\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> ICatMapper\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> catMapper\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">    public\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> CatsController\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sw29p\">        ICatRepository\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> catRepository\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">,\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sw29p\">        ICatMapper\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> catMapper\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">)\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">    {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sK46n\">        this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">catRepository\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> catRepository\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sK46n\">        this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">catMapper\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> catMapper\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">    }\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">    [\u003C\u002Fspan>\u003Cspan class=\"sw29p\">HttpGet\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"swiDo\">\"\"\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">)]\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">    public\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> async\u003C\u002Fspan>\u003Cspan class=\"sw29p\"> Task\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sw29p\">IActionResult\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">> \u003C\u002Fspan>\u003Cspan class=\"sWm5y\">GetCats\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sw29p\">CancellationToken\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> cancellationToken\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">)\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">    {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s4J9F\">        var\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> cats\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> await\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">catRepository\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">GetAll\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">cancellationToken\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">);\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s4J9F\">        var\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> lastModified\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> cats\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">Count\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> ==\u003C\u002Fspan>\u003Cspan class=\"s0PsH\"> 0\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> ?\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"> \n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">            (\u003C\u002Fspan>\u003Cspan class=\"sw29p\">DateTimeOffset\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">?)\u003C\u002Fspan>\u003Cspan class=\"sMc8R\">null\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> :\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"> \n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">            cats\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Max\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">x\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =>\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> x\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">ModifiedTimestamp\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">);\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sK46n\">        this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">Response\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">GetTypedHeaders\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">().\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">LastModified\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> lastModified\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">;\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s4J9F\">        var\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> requestHeaders\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">Request\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">GetTypedHeaders\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">();\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"smL5M\">        if\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"> (\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">requestHeaders\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">IfModifiedSince\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">HasValue\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> &&\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">            requestHeaders\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">IfModifiedSince\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">Value\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> >=\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> lastModified\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">)\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">        {\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"smL5M\">            return\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">StatusCode\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">StatusCodes\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">Status304NotModified\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">);\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">        }\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"s4J9F\">        var\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> catViewModels\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">catMapper\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">MapList\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">cats\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">);\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"smL5M\">        return\u003C\u002Fspan>\u003Cspan class=\"sK46n\"> this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Ok\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">catViewModels\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">);\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">    }\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">}\n\u003C\u002Fspan>\u003C\u002Fspan>",[70,334,335],{},"All of our cats have a ModifiedTimestamp, so we know when they were last changed. There are four scenarios that this action method handles:",[257,337,338,341,347,352],{},[168,339,340],{},"Our repository does not contain any cats, so just always return an empty list.",[168,342,343,344,346],{},"No ",[104,345,323],{}," HTTP header exists in the request, so we just return all cats.",[168,348,349,351],{},[104,350,323],{}," HTTP header exists and cats have been modified since that date, so return all cats.",[168,353,354,356],{},[104,355,323],{}," HTTP header exists but no cats have been modified since that date, so return a 304 Not Modified response.",[70,358,359,360,362],{},"In all cases, except when we have no cats at all, we set the ",[104,361,323],{}," date to the latest date than any cat has been modified.",[45,364,366,373],{"id":365},"conclusions",[49,367,369],{"href":368,"label":52},"#conclusions",[54,370,371],{"xmlns":56,"xmlns:xlink":57,"viewBox":58,"version":59,"width":60,"height":60,"aria-hidden":61},[63,372],{"fill":65,"fill-rule":66,"d":67},"Conclusions",[70,375,376,377,379,380,382,383,385],{},"Which caching HTTP headers you pick, depends on your data but at a minimum, I would add ",[104,378,264],{},"'s or ",[104,381,323],{},". Add ",[104,384,82],{}," where possible, usually for static assets.",[387,388,389],"style",{},"html pre.shiki code .sjLUg, html code.shiki .sjLUg{--shiki-default:#000000;--shiki-dark:#F8F8F2}html pre.shiki code .sw29p, html code.shiki .sw29p{--shiki-default:#267F99;--shiki-default-text-decoration:inherit;--shiki-dark:#A6E22E;--shiki-dark-text-decoration:underline}html pre.shiki code .sFrd5, html code.shiki .sFrd5{--shiki-default:#001080;--shiki-dark:#F8F8F2}html pre.shiki code .snCLD, html code.shiki .snCLD{--shiki-default:#000000;--shiki-dark:#F92672}html pre.shiki code .s0PsH, html code.shiki .s0PsH{--shiki-default:#098658;--shiki-dark:#AE81FF}html pre.shiki code .sJvqV, html code.shiki .sJvqV{--shiki-default:#0000FF;--shiki-dark:#F92672}html pre.shiki code .sWm5y, html code.shiki .sWm5y{--shiki-default:#795E26;--shiki-dark:#A6E22E}html .default .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .shiki span {color: var(--shiki-default);background: var(--shiki-default-bg);font-style: var(--shiki-default-font-style);font-weight: var(--shiki-default-font-weight);text-decoration: var(--shiki-default-text-decoration);}html .dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html.dark .shiki span {color: var(--shiki-dark);background: var(--shiki-dark-bg);font-style: var(--shiki-dark-font-style);font-weight: var(--shiki-dark-font-weight);text-decoration: var(--shiki-dark-text-decoration);}html pre.shiki code .swiDo, html code.shiki .swiDo{--shiki-default:#A31515;--shiki-dark:#E6DB74}html pre.shiki code .sK46n, html code.shiki .sK46n{--shiki-default:#0000FF;--shiki-dark:#FD971F}html pre.shiki code .s1q82, html code.shiki .s1q82{--shiki-default:#008000;--shiki-dark:#88846F}html pre.shiki code .s4J9F, html code.shiki .s4J9F{--shiki-default:#0000FF;--shiki-default-font-style:inherit;--shiki-dark:#66D9EF;--shiki-dark-font-style:italic}html pre.shiki code .smL5M, html code.shiki .smL5M{--shiki-default:#AF00DB;--shiki-dark:#F92672}html pre.shiki code .svrZB, html code.shiki .svrZB{--shiki-default:#0451A5;--shiki-default-font-style:inherit;--shiki-dark:#66D9EF;--shiki-dark-font-style:italic}html pre.shiki code .syaXe, html code.shiki .syaXe{--shiki-default:#A31515;--shiki-dark:#CFCFC2}html pre.shiki code .sjbfc, html code.shiki .sjbfc{--shiki-default:#800000;--shiki-dark:#F92672}html pre.shiki code .sNflI, html code.shiki .sNflI{--shiki-default:#800000;--shiki-dark:#F8F8F2}html pre.shiki code .snDo4, html code.shiki .snDo4{--shiki-default:#E50000;--shiki-dark:#A6E22E}html pre.shiki code .sfK3G, html code.shiki .sfK3G{--shiki-default:#000000FF;--shiki-dark:#F8F8F2}html pre.shiki code .squEy, html code.shiki .squEy{--shiki-default:#0000FF;--shiki-dark:#E6DB74}html pre.shiki code .sMc8R, html code.shiki .sMc8R{--shiki-default:#0000FF;--shiki-dark:#AE81FF}",{"title":98,"searchDepth":391,"depth":391,"links":392},2,[],{"issue":394,"comments":398},{"number":395,"title":396,"html_url":397},53,"[Comment] ASP.NET Core Caching in Practice","https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F53",[399,411,420,428,437,445,453,461,470,478,486,494,502,515,526,534,542,550,558],{"id":400,"html_url":401,"body_html":402,"created_at":403,"updated_at":403,"author_association":404,"user":405,"reactions":409},627234453,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F53#issuecomment-627234453","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F095e3b4df2a4cc3f7edb4472772f67ce5ee4561792fc4b91cd53b53cc31ff35b\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f63376630363935376439373964643932666237643634623764376430303262663f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Robin\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F095e3b4df2a4cc3f7edb4472772f67ce5ee4561792fc4b91cd53b53cc31ff35b\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f63376630363935376439373964643932666237643634623764376430303262663f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>\u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"http:\u002F\u002Ffloodassist.co.uk\u002F\">Robin\u003C\u002Fa>\u003C\u002Fstrong> commented on \u003Cstrong>2017-10-26 15:48:26\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>hmmm, I'm doing similar things by adding the following to my Configure method in startup.cs:\u003C\u002Fp>\n\u003Cdiv>\u003Cpre>\u003Cspan>app\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>UseStaticFiles\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>new\u003C\u002Fspan> \u003Cspan>StaticFileOptions\u003C\u002Fspan>\n\u003Cspan>{\u003C\u002Fspan>\n    \u003Cspan>OnPrepareResponse\u003C\u002Fspan> \u003Cspan>=\u003C\u002Fspan> \u003Cspan>ctx\u003C\u002Fspan> \u003Cspan>=\u003C\u002Fspan>\n    \u003Cspan>{\u003C\u002Fspan>\n        \u003Cspan>const\u003C\u002Fspan> int durationInSeconds \u003Cspan>=\u003C\u002Fspan> \u003Cspan>60\u003C\u002Fspan> \u003Cspan>*\u003C\u002Fspan> \u003Cspan>60\u003C\u002Fspan> \u003Cspan>*\u003C\u002Fspan> \u003Cspan>24\u003C\u002Fspan> \u003Cspan>*\u003C\u002Fspan> \u003Cspan>1\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan> \u003Cspan>\u002F\u002Fone day!\u003C\u002Fspan>\n        ctx\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Context\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Response\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Headers\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Add\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>\"cache-control\"\u003C\u002Fspan>\u003Cspan>,\u003C\u002Fspan> \u003Cspan>new\u003C\u002Fspan>\u003Cspan>[\u003C\u002Fspan>\u003Cspan>]\u003C\u002Fspan> \u003Cspan>{\u003C\u002Fspan> \u003Cspan>\"public,max-age=\"\u003C\u002Fspan> \u003Cspan>+\u003C\u002Fspan> \u003Cspan>durationInSeconds\u003C\u002Fspan> \u003Cspan>}\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan>\n        ctx\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Context\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Response\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Headers\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Add\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>\"Expires\"\u003C\u002Fspan>\u003Cspan>,\u003C\u002Fspan> \u003Cspan>new\u003C\u002Fspan>\u003Cspan>[\u003C\u002Fspan>\u003Cspan>]\u003C\u002Fspan> \u003Cspan>{\u003C\u002Fspan> \u003Cspan>DateTime\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>UtcNow\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>AddSeconds\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>durationInSeconds\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>ToString\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>\"R\"\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan> \u003Cspan>}\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan> \u003Cspan>\u002F\u002F Format RFC1123\u003C\u002Fspan>\n    \u003Cspan>}\u003C\u002Fspan>\n\u003Cspan>}\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan>\u003C\u002Fpre>\u003C\u002Fdiv>\n\u003Cp>I'm only concerned with caching \"big\" things like images etc (which is why its for static files).\u003C\u002Fp>","2020-05-12T09:47:33Z","OWNER",{"login":406,"avatar_url":407,"html_url":408},"RehanSaeed","https:\u002F\u002Favatars.githubusercontent.com\u002Fu\u002F2270364?v=4","https:\u002F\u002Fgithub.com\u002FRehanSaeed",{"url":410,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627234453\u002Freactions",{"id":412,"html_url":413,"body_html":414,"created_at":415,"updated_at":416,"author_association":404,"user":417,"reactions":418},627234506,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F53#issuecomment-627234506","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F0e25150d582639209d75a3759473963fd9037a9855f9d038ba458448366d4f1a\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f37643566306636396566323735353137633232303437656339663761663332303f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Shahzad Hassan\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F0e25150d582639209d75a3759473963fd9037a9855f9d038ba458448366d4f1a\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f37643566306636396566323735353137633232303437656339663761663332303f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>\u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\u002F\u002Fwww.softmatters.co.uk\u002F\">Shahzad Hassan\u003C\u002Fa>\u003C\u002Fstrong> commented on \u003Cstrong>2017-10-26 16:08:14\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>Thanks for sharing. Yet again, a very nice blog indeed. I have a question for you.\u003C\u002Fp>\n\u003Cp>I know that Response Caching cannot be used if \u003Ccode>Authorization\u003C\u002Fcode> header is present in the request. I have a scenario where multiple API subscribers need to pass in a \u003Ccode>Bearer\u003C\u002Fcode> token in the \u003Ccode>Authorization\u003C\u002Fcode> header so the request can be authenticated\u002Fauthorized. However, the response of a REST API call is exactly the same regardless of who is calling, as far as they are authenticated.\u003C\u002Fp>\n\u003Cp>How would you approach to solve this particular problem? Would you recommend implementing a custom caching layer using \u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\u002F\u002Fdocs.microsoft.com\u002Fen-us\u002Faspnet\u002Fcore\u002Fmvc\u002Fcontrollers\u002Ffilters#resource-filters\">ResourceFilters\u003C\u002Fa> or something as they will be second in a row after the \u003Ccode>AuthorizeFilters\u003C\u002Fcode>? What are your thoughts on it?\u003C\u002Fp>\n\u003Cp>Thanks\u003C\u002Fp>","2020-05-12T09:47:40Z","2020-05-12T12:55:42Z",{"login":406,"avatar_url":407,"html_url":408},{"url":419,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627234506\u002Freactions",{"id":421,"html_url":422,"body_html":423,"created_at":424,"updated_at":424,"author_association":404,"user":425,"reactions":426},627234544,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F53#issuecomment-627234544","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F8a07049df41b8a3839a3f4342f09ea8e6e7fa0065667687f04beca2d088a1dca\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f32623266393030653361633066353535316462646537323864336262343935343f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Muhammad Rehan Saeed\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F8a07049df41b8a3839a3f4342f09ea8e6e7fa0065667687f04beca2d088a1dca\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f32623266393030653361633066353535316462646537323864336262343935343f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>\u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\u002F\u002Frehansaeed.com\u002F\">Muhammad Rehan Saeed\u003C\u002Fa>\u003C\u002Fstrong> commented on \u003Cstrong>2017-11-13 09:03:31\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>hmmm, I'm doing similar things by adding the following to my Configure method in startup.cs:\u003C\u002Fp>\n\u003Cdiv>\u003Cpre>\u003Cspan>app\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>UseStaticFiles\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>new\u003C\u002Fspan> \u003Cspan>StaticFileOptions\u003C\u002Fspan>\n\u003Cspan>{\u003C\u002Fspan>\n    \u003Cspan>OnPrepareResponse\u003C\u002Fspan> \u003Cspan>=\u003C\u002Fspan> \u003Cspan>ctx\u003C\u002Fspan> \u003Cspan>=\u003C\u002Fspan>\n    \u003Cspan>{\u003C\u002Fspan>\n        \u003Cspan>const\u003C\u002Fspan> int durationInSeconds \u003Cspan>=\u003C\u002Fspan> \u003Cspan>60\u003C\u002Fspan> \u003Cspan>*\u003C\u002Fspan> \u003Cspan>60\u003C\u002Fspan> \u003Cspan>*\u003C\u002Fspan> \u003Cspan>24\u003C\u002Fspan> \u003Cspan>*\u003C\u002Fspan> \u003Cspan>1\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan> \u003Cspan>\u002F\u002Fone day!\u003C\u002Fspan>\n        \u003Cspan>ctx\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Context\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Response\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Headers\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Add\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>\"cache-control\"\u003C\u002Fspan>\u003Cspan>,\u003C\u002Fspan> \u003Cspan>new\u003C\u002Fspan>\u003Cspan>[\u003C\u002Fspan>\u003Cspan>]\u003C\u002Fspan> \u003Cspan>{\u003C\u002Fspan> \u003Cspan>\"public,max-age=\"\u003C\u002Fspan> \u003Cspan>+\u003C\u002Fspan> \u003Cspan>durationInSeconds\u003C\u002Fspan> \u003Cspan>}\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan>\n        ctx\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Context\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Response\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Headers\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Add\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>\"Expires\"\u003C\u002Fspan>\u003Cspan>,\u003C\u002Fspan> \u003Cspan>new\u003C\u002Fspan>\u003Cspan>[\u003C\u002Fspan>\u003Cspan>]\u003C\u002Fspan> \u003Cspan>{\u003C\u002Fspan> \u003Cspan>DateTime\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>UtcNow\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>AddSeconds\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>durationInSeconds\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>ToString\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>\"R\"\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan> \u003Cspan>}\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan> \u003Cspan>\u002F\u002F Format RFC1123\u003C\u002Fspan>\n    \u003Cspan>}\u003C\u002Fspan>\n\u003Cspan>}\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan>\u003C\u002Fpre>\u003C\u002Fdiv>\n\u003Cp>I'm only concerned with caching \"big\" things like images etc (which is why its for static files).\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cp>Looks reasonable. Setting \u003Ccode>Cache-Control\u003C\u002Fcode>, \u003Ccode>Expires\u003C\u002Fcode> and \u003Ccode>Pragma\u003C\u002Fcode> HTTP headers is complicated, which is why I use the helper method.\u003C\u002Fp>","2020-05-12T09:47:46Z",{"login":406,"avatar_url":407,"html_url":408},{"url":427,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627234544\u002Freactions",{"id":429,"html_url":430,"body_html":431,"created_at":432,"updated_at":433,"author_association":404,"user":434,"reactions":435},627234595,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F53#issuecomment-627234595","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F8a07049df41b8a3839a3f4342f09ea8e6e7fa0065667687f04beca2d088a1dca\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f32623266393030653361633066353535316462646537323864336262343935343f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Muhammad Rehan Saeed\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F8a07049df41b8a3839a3f4342f09ea8e6e7fa0065667687f04beca2d088a1dca\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f32623266393030653361633066353535316462646537323864336262343935343f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>\u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\u002F\u002Frehansaeed.com\u002F\">Muhammad Rehan Saeed\u003C\u002Fa>\u003C\u002Fstrong> commented on \u003Cstrong>2017-11-13 09:11:13\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>Thanks for sharing. Yet again, a very nice blog indeed. I have a question for you.\u003C\u002Fp>\n\u003Cp>I know that Response Caching cannot be used if \u003Ccode>Authorization\u003C\u002Fcode> header is present in the request. I have a scenario where multiple API subscribers need to pass in a \u003Ccode>Bearer\u003C\u002Fcode> token in the \u003Ccode>Authorization\u003C\u002Fcode> header so the request can be authenticated\u002Fauthorized. However, the response of a REST API call is exactly the same regardless of who is calling, as far as they are authenticated.\u003C\u002Fp>\n\u003Cp>How would you approach to solve this particular problem? Would you recommend implementing a custom caching layer using \u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\u002F\u002Fdocs.microsoft.com\u002Fen-us\u002Faspnet\u002Fcore\u002Fmvc\u002Fcontrollers\u002Ffilters#resource-filters\">ResourceFilters\u003C\u002Fa> or something as they will be second in a row after the \u003Ccode>AuthorizeFilters\u003C\u002Fcode>? What are your thoughts on it?\u003C\u002Fp>\n\u003Cp>Thanks\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fgithub.com\u002Faspnet\u002FResponseCaching\u002Fissues\u002F128\">This\u003C\u002Fa> GitHub issue in the aspnet\u002FResponseCache repository deals with caching being turned off when the \u003Ccode>Authorization\u003C\u002Fcode> HTTP header is present.\u003C\u002Fp>\n\u003Cp>In my opinion, the best way to go might be to override or replace the logic in the \u003Ccode>ResponseCache\u003C\u002Fcode> middleware where caching is turned off based on the \u003Ccode>Authorization\u003C\u002Fcode> HTTP header.\u003C\u002Fp>","2020-05-12T09:47:53Z","2020-05-12T12:55:53Z",{"login":406,"avatar_url":407,"html_url":408},{"url":436,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627234595\u002Freactions",{"id":438,"html_url":439,"body_html":440,"created_at":441,"updated_at":441,"author_association":404,"user":442,"reactions":443},627234653,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F53#issuecomment-627234653","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F0e25150d582639209d75a3759473963fd9037a9855f9d038ba458448366d4f1a\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f37643566306636396566323735353137633232303437656339663761663332303f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Shahzad Hassan\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F0e25150d582639209d75a3759473963fd9037a9855f9d038ba458448366d4f1a\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f37643566306636396566323735353137633232303437656339663761663332303f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>Shahzad Hassan\u003C\u002Fstrong> commented on \u003Cstrong>2017-11-23 08:26:51\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fgithub.com\u002Faspnet\u002FResponseCaching\u002Fissues\u002F128\">This\u003C\u002Fa> GitHub issue in the aspnet\u002FResponseCache repository deals with caching being turned off when the Authorization HTTP header is present.\u003C\u002Fp>\n\u003Cp>In my opinion, the best way to go might be to override or replace the logic in the \u003Ccode>ResponseCache\u003C\u002Fcode> middleware where caching is turned off based on the \u003Ccode>Authorization\u003C\u002Fcode> HTTP header.\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cp>Ok, Thanks. Makes sense, l will have a look.\u003C\u002Fp>","2020-05-12T09:48:00Z",{"login":406,"avatar_url":407,"html_url":408},{"url":444,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627234653\u002Freactions",{"id":446,"html_url":447,"body_html":448,"created_at":449,"updated_at":449,"author_association":404,"user":450,"reactions":451},627234705,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F53#issuecomment-627234705","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F97f955c2d8396debf29d1fbdb913ce2ae703b11db57ddef581dc6748cedccf82\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f62636530356332376530373566306265643031633164656365613334333263363f733d393626643d6d6d26723d67\">\u003Cimg alt=\"John\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F97f955c2d8396debf29d1fbdb913ce2ae703b11db57ddef581dc6748cedccf82\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f62636530356332376530373566306265643031633164656365613334333263363f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>John\u003C\u002Fstrong> commented on \u003Cstrong>2018-06-29 08:16:29\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>Nice post. The way you controller works it's kind confusing me. You always hit the db to fetch all the data anyway.. so no much optimization there. Or maybe was just a silly example? Thanks!\u003C\u002Fp>","2020-05-12T09:48:06Z",{"login":406,"avatar_url":407,"html_url":408},{"url":452,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627234705\u002Freactions",{"id":454,"html_url":455,"body_html":456,"created_at":457,"updated_at":457,"author_association":404,"user":458,"reactions":459},627234755,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F53#issuecomment-627234755","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F8a07049df41b8a3839a3f4342f09ea8e6e7fa0065667687f04beca2d088a1dca\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f32623266393030653361633066353535316462646537323864336262343935343f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Muhammad Rehan Saeed\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F8a07049df41b8a3839a3f4342f09ea8e6e7fa0065667687f04beca2d088a1dca\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f32623266393030653361633066353535316462646537323864336262343935343f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>\u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\u002F\u002Frehansaeed.com\u002F\">Muhammad Rehan Saeed\u003C\u002Fa>\u003C\u002Fstrong> commented on \u003Cstrong>2018-06-29 09:23:56\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>Nice post. The way you controller works it's kind confusing me. You always hit the db to fetch all the data anyway.. so no much optimization there. Or maybe was just a silly example? Thanks!\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cp>Yes, that's a good point. The code I've shown optimises what gets sent over the wire but not the database calls. If you wanted to optimise the database call, you could start with a query that returns the count for the number of items and the latest modified timestamp and use that to figure out if you need to do another query to get all of the data or return a 304 not modified response.\u003C\u002Fp>","2020-05-12T09:48:13Z",{"login":406,"avatar_url":407,"html_url":408},{"url":460,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627234755\u002Freactions",{"id":462,"html_url":463,"body_html":464,"created_at":465,"updated_at":466,"author_association":404,"user":467,"reactions":468},627234798,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F53#issuecomment-627234798","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F5d0e61aadaeab789925a1b7811f32f3019ebb96bf6a64f8f5f0b4d61f91b5117\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f65653862333962633233363632323633616361613063373331333164346363383f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Noah\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F5d0e61aadaeab789925a1b7811f32f3019ebb96bf6a64f8f5f0b4d61f91b5117\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f65653862333962633233363632323633616361613063373331333164346363383f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>Noah\u003C\u002Fstrong> commented on \u003Cstrong>2018-11-16 07:43:47\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>Great article about caching. While, I have read HTTP-based cache mechanism \u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\u002F\u002Fdocs.microsoft.com\u002Fen-us\u002Faspnet\u002Fcore\u002Fperformance\u002Fcaching\u002Fresponse?view=aspnetcore-2.1\">here\u003C\u002Fa>, and I want to know does HTTP-based cache make sense for an Web API application? Back to your example for \u003Ccode>Last-Modified\u003C\u002Fcode> & \u003Ccode>If-Modified-Since\u003C\u002Fcode>, is it reasonable for an API client receiving 304 response? Could you provide some advice and best practices about implementing HTTP-based cache for a Web API application? Thanks.\u003C\u002Fp>","2020-05-12T09:48:20Z","2020-05-12T09:48:33Z",{"login":406,"avatar_url":407,"html_url":408},{"url":469,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627234798\u002Freactions",{"id":471,"html_url":472,"body_html":473,"created_at":474,"updated_at":474,"author_association":404,"user":475,"reactions":476},627234862,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F53#issuecomment-627234862","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F8a07049df41b8a3839a3f4342f09ea8e6e7fa0065667687f04beca2d088a1dca\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f32623266393030653361633066353535316462646537323864336262343935343f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Muhammad Rehan Saeed\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F8a07049df41b8a3839a3f4342f09ea8e6e7fa0065667687f04beca2d088a1dca\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f32623266393030653361633066353535316462646537323864336262343935343f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>\u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\u002F\u002Frehansaeed.com\u002F\">Muhammad Rehan Saeed\u003C\u002Fa>\u003C\u002Fstrong> commented on \u003Cstrong>2018-11-16 09:06:25\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>Great article about caching. While, I have read HTTP-based cache mechanism \u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\u002F\u002Fdocs.microsoft.com\u002Fen-us\u002Faspnet\u002Fcore\u002Fperformance\u002Fcaching\u002Fresponse?view=aspnetcore-2.1\">here\u003C\u002Fa>, and I want to know does HTTP-based cache make sense for an Web API application? Back to your example for \u003Ccode>Last-Modified\u003C\u002Fcode> & \u003Ccode>If-Modified-Since\u003C\u002Fcode>, is it reasonable for an API client receiving 304 response? Could you provide some advice and best practices about implementing HTTP-based cache for a Web API application? Thanks.\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cp>It does make sense sometimes. If the resource you are getting has a last modified date that you store in the database, you can take that and turn it into \u003Ccode>Last-Modified\u003C\u002Fcode> & \u003Ccode>If-Modified-Since\u003C\u002Fcode> HTTP headers. If your client is a web browser, then it will respect the header. If the client is custom code such as C#'s \u003Ccode>HttpClient\u003C\u002Fcode>, then you will need to write some extra code to respect the HTTP headers and cache responses.\u003C\u002Fp>","2020-05-12T09:48:27Z",{"login":406,"avatar_url":407,"html_url":408},{"url":477,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627234862\u002Freactions",{"id":479,"html_url":480,"body_html":481,"created_at":482,"updated_at":482,"author_association":404,"user":483,"reactions":484},627234931,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F53#issuecomment-627234931","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F8a07049df41b8a3839a3f4342f09ea8e6e7fa0065667687f04beca2d088a1dca\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f32623266393030653361633066353535316462646537323864336262343935343f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Muhammad Rehan Saeed\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F8a07049df41b8a3839a3f4342f09ea8e6e7fa0065667687f04beca2d088a1dca\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f32623266393030653361633066353535316462646537323864336262343935343f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>\u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\u002F\u002Frehansaeed.com\u002F\">Muhammad Rehan Saeed\u003C\u002Fa>\u003C\u002Fstrong> commented on \u003Cstrong>2018-12-01 10:59:58\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>Great article about caching. While, I have read HTTP-based cache mechanism \u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\u002F\u002Fdocs.microsoft.com\u002Fen-us\u002Faspnet\u002Fcore\u002Fperformance\u002Fcaching\u002Fresponse?view=aspnetcore-2.1\">here\u003C\u002Fa>, and I want to know does HTTP-based cache make sense for an Web API application? Back to your example for \u003Ccode>Last-Modified\u003C\u002Fcode> & \u003Ccode>If-Modified-Since\u003C\u002Fcode>, is it reasonable for an API client receiving 304 response? Could you provide some advice and best practices about implementing HTTP-based cache for a Web API application? Thanks.\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cp>I can make sense for an API. You just need to know when the resource was last changed. Also, the client has to support caching headers and store resources in some way that makes sense.\u003C\u002Fp>","2020-05-12T09:48:34Z",{"login":406,"avatar_url":407,"html_url":408},{"url":485,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627234931\u002Freactions",{"id":487,"html_url":488,"body_html":489,"created_at":490,"updated_at":490,"author_association":404,"user":491,"reactions":492},627234997,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F53#issuecomment-627234997","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F5e0cbb5e5f680a77bb3567e6068a7f0b1fdf7326c969dc1323eaaa0bfade2d40\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f34343031383135303037366631653430663138363663623532346435323565353f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Abhi\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002F5e0cbb5e5f680a77bb3567e6068a7f0b1fdf7326c969dc1323eaaa0bfade2d40\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f34343031383135303037366631653430663138363663623532346435323565353f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>Abhi\u003C\u002Fstrong> commented on \u003Cstrong>2019-04-12 12:37:50\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>Hi,\u003C\u002Fp>\n\u003Cp>Thank you for good article,\u003C\u002Fp>\n\u003Cp>I am getting error on the line\u003C\u002Fp>\n\u003Cdiv>\u003Cpre>\u003Cspan>var\u003C\u002Fspan> \u003Cspan>cacheProfiles\u003C\u002Fspan> \u003Cspan>=\u003C\u002Fspan> \u003Cspan>this\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>configuration\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>GetSection\u003C\u002Fspan>\u003Cspan><\u003C\u002Fspan>\u003Cspan>Dictionary\u003C\u002Fspan>\u003Cspan><\u003C\u002Fspan>\u003Cspan>string\u003C\u002Fspan>\u003Cspan>,\u003C\u002Fspan> \u003Cspan>CacheProfile\u003C\u002Fspan>\u003Cspan>>\u003C\u002Fspan>\u003Cspan>>\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan>\u003C\u002Fpre>\u003C\u002Fdiv>\n\u003Cp>GetSection not supporting..\u003C\u002Fp>\n\u003Cp>.netcore 2.1 framework\u003C\u002Fp>","2020-05-12T09:48:41Z",{"login":406,"avatar_url":407,"html_url":408},{"url":493,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627234997\u002Freactions",{"id":495,"html_url":496,"body_html":497,"created_at":498,"updated_at":498,"author_association":404,"user":499,"reactions":500},627235062,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F53#issuecomment-627235062","\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fcamo.githubusercontent.com\u002Fc918ba8e7337b7c49e08f2ddb97846155fcd9598aaef780b13515dc87345cb2a\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f63366530373537303839626336653834326663633361656264306439316433313f733d393626643d6d6d26723d67\">\u003Cimg alt=\"Al Stevens\" height=\"40\" width=\"40\" src=\"https:\u002F\u002Fcamo.githubusercontent.com\u002Fc918ba8e7337b7c49e08f2ddb97846155fcd9598aaef780b13515dc87345cb2a\u002F68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f63366530373537303839626336653834326663633361656264306439316433313f733d393626643d6d6d26723d67\" \u002F>\u003C\u002Fa> \u003Cstrong>Al Stevens\u003C\u002Fstrong> commented on \u003Cstrong>2019-12-16 17:49:31\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>Hi,\u003C\u002Fp>\n\u003Cp>Thank you for good article,\u003C\u002Fp>\n\u003Cp>I am getting error on the line\u003C\u002Fp>\n\u003Cdiv>\u003Cpre>\u003Cspan>var\u003C\u002Fspan> \u003Cspan>cacheProfiles\u003C\u002Fspan> \u003Cspan>=\u003C\u002Fspan> \u003Cspan>this\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>configuration\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>GetSection\u003C\u002Fspan>\u003Cspan><\u003C\u002Fspan>\u003Cspan>Dictionary\u003C\u002Fspan>\u003Cspan><\u003C\u002Fspan>\u003Cspan>string\u003C\u002Fspan>\u003Cspan>,\u003C\u002Fspan> \u003Cspan>CacheProfile\u003C\u002Fspan>\u003Cspan>>\u003C\u002Fspan>\u003Cspan>>\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan>\u003C\u002Fpre>\u003C\u002Fdiv>\n\u003Cp>GetSection not supporting..\u003C\u002Fp>\n\u003Cp>.netcore 2.1 framework\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cp>Abhi,\u003C\u002Fp>\n\u003Cp>I hit the same thing too, you need to change it to the following:\u003C\u002Fp>\n\u003Cdiv>\u003Cpre>\u003Cspan>var\u003C\u002Fspan> \u003Cspan>cacheProfiles\u003C\u002Fspan> \u003Cspan>=\u003C\u002Fspan> \u003Cspan>this\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>configuration\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>GetSection\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>\"CacheProfiles\"\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>.\u003C\u002Fspan>\u003Cspan>Get\u003C\u002Fspan>\u003Cspan><\u003C\u002Fspan>\u003Cspan>Dictionary\u003C\u002Fspan>\u003Cspan><\u003C\u002Fspan>\u003Cspan>string\u003C\u002Fspan>\u003Cspan>,\u003C\u002Fspan> \u003Cspan>CacheProfile\u003C\u002Fspan>\u003Cspan>>\u003C\u002Fspan>\u003Cspan>>\u003C\u002Fspan>\u003Cspan>(\u003C\u002Fspan>\u003Cspan>)\u003C\u002Fspan>\u003Cspan>;\u003C\u002Fspan>\u003C\u002Fpre>\u003C\u002Fdiv>\n\u003Cp>Hope that helps.\u003C\u002Fp>","2020-05-12T09:48:48Z",{"login":406,"avatar_url":407,"html_url":408},{"url":501,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F627235062\u002Freactions",{"id":503,"html_url":504,"body_html":505,"created_at":506,"updated_at":506,"author_association":507,"user":508,"reactions":512},688483940,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F53#issuecomment-688483940","\u003Cp>Thanks the article helped me\u003C\u002Fp>","2020-09-07T19:28:42Z","NONE",{"login":509,"avatar_url":510,"html_url":511},"xhafan","https:\u002F\u002Favatars.githubusercontent.com\u002Fu\u002F13038902?v=4","https:\u002F\u002Fgithub.com\u002Fxhafan",{"url":513,"total_count":514,"+1":514,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F688483940\u002Freactions",1,{"id":516,"html_url":517,"body_html":518,"created_at":519,"updated_at":519,"author_association":507,"user":520,"reactions":524},773352843,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F53#issuecomment-773352843","\u003Cp>I'm trying to do the same thing you described in the 'Last-Modified & If-Modified-Since' section.  However, after the initial call to the controller, Chrome (and I tested FF too) doesn't even call back to my controller.  I simply returns like this:\u003C\u002Fp>\n\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fuser-images.githubusercontent.com\u002F6237247\u002F106906603-f67ce180-66c2-11eb-9ee0-c7766f3e5229.png\">\u003Cimg alt=\"image\" src=\"https:\u002F\u002Fuser-images.githubusercontent.com\u002F6237247\u002F106906603-f67ce180-66c2-11eb-9ee0-c7766f3e5229.png\" \u002F>\u003C\u002Fa>\u003C\u002Fp>\n\u003Cp>It says \u003Cem>(disk cache)\u003C\u002Fem>.  I haven't done any 'configuration setup' in \u003Ccode>Startup\u003C\u002Fcode>.  I simply implemented code for checking if-modified-since against our database timestamp.  Do I need code in \u003Ccode>Startup\u003C\u002Fcode> to make this work?\u003C\u002Fp>","2021-02-04T14:30:26Z",{"login":521,"avatar_url":522,"html_url":523},"terryaney","https:\u002F\u002Favatars.githubusercontent.com\u002Fu\u002F6237247?v=4","https:\u002F\u002Fgithub.com\u002Fterryaney",{"url":525,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F773352843\u002Freactions",{"id":527,"html_url":528,"body_html":529,"created_at":530,"updated_at":530,"author_association":404,"user":531,"reactions":532},773395331,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F53#issuecomment-773395331","\u003Cp>\u003Ca target=\"_blank\" rel=\"nofollow noopener noreferrer\" href=\"https:\u002F\u002Fgithub.com\u002Fterryaney\">@terryaney\u003C\u002Fa> If you've implemented the headers you mention correctly and the header is telling the browser that a resource has not been modified since it last made a request to the resource then the browser will cache that resource. This is why you get a 'disk cache' in the browsers network tab. Is that not what you want?\u003C\u002Fp>","2021-02-04T15:31:02Z",{"login":406,"avatar_url":407,"html_url":408},{"url":533,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F773395331\u002Freactions",{"id":535,"html_url":536,"body_html":537,"created_at":538,"updated_at":538,"author_association":507,"user":539,"reactions":540},773441088,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F53#issuecomment-773441088","\u003Cp>I'm just saying that it doesn't even post back to my action so that I can check 'if-modified-since' against my database.  The browser just caches it itself.  So when I update the resource in our database, the new version is never returned because it doesn't hit my code.\u003C\u002Fp>\n\u003Cdiv>\u003Cpre>\u003Ccode>protected async Task<IActionResult> CachedOrModifiedAsync( CacheDownloadInfo cacheDownloadInfo, IDbConnectionFactory dbConnectionFactory )\n{\n\tvar lastModifiedDate = cacheDownloadInfo.LastModifiedDate.Value.ToUniversalTime();\n\n\t\u002F\u002F https:\u002F\u002Frehansaeed.com\u002Fasp-net-core-caching-in-practice\u002F#last-modified--if-modified-since\n\t\u002F\u002F https:\u002F\u002Fwww.geekytidbits.com\u002Fefficient-caching-dynamic-resources-asp-net-304-not-modified\u002F\n\tvar requestHeaders = HttpContext.Request.GetTypedHeaders();\n\tif ( !requestHeaders.IfModifiedSince.HasValue )\n\t{\n\t\t\u002F\u002F Set Last Modified time\n\t\tHttpContext.Response.GetTypedHeaders().LastModified = lastModifiedDate;\n\t}\n\telse\n\t{\n\t\t\u002F\u002F HTTP does not provide milliseconds, so remove it from the comparison\n\t\tif ( lastModifiedDate.AddMilliseconds( -lastModifiedDate.Millisecond ) == requestHeaders.IfModifiedSince.Value )\n\t\t{\n\t\t\treturn NotModified();\n\t\t}\n\t}\n\n\tvar bds = new SqlBinaryDataStream<Guid>( dbConnectionFactory.GetDataLockerConnectionString(), \"Cache\", \"UID\", \"Content\", cacheDownloadInfo.Token.Value );\n\treturn new FileStreamResult( await bds.ContentIsCompressedAsync ? new GZipStream( bds, CompressionMode.Decompress ) : bds, cacheDownloadInfo.ContentType );\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>","2021-02-04T16:35:45Z",{"login":521,"avatar_url":522,"html_url":523},{"url":541,"total_count":514,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":514},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F773441088\u002Freactions",{"id":543,"html_url":544,"body_html":545,"created_at":546,"updated_at":546,"author_association":404,"user":547,"reactions":548},773492630,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F53#issuecomment-773492630","\u003Cp>Perhaps consider creating a small sample app and posting the question on StackOverflow to get some eyes on it (I'll also take a look).\u003C\u002Fp>","2021-02-04T17:51:25Z",{"login":406,"avatar_url":407,"html_url":408},{"url":549,"total_count":4,"+1":4,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F773492630\u002Freactions",{"id":551,"html_url":552,"body_html":553,"created_at":554,"updated_at":554,"author_association":507,"user":555,"reactions":556},773563957,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F53#issuecomment-773563957","\u003Cp>I didn't make a 'sample app'.  I just pasted my controller and caching code.  \u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\u002F\u002Fstackoverflow.com\u002Fquestions\u002F66052852\u002Fasp-net-core-web-api-checking-if-modified-since-header-not-working-because-brows\">https:\u002F\u002Fstackoverflow.com\u002Fquestions\u002F66052852\u002Fasp-net-core-web-api-checking-if-modified-since-header-not-working-because-brows\u003C\u002Fa>  Will see if anyone has ideas.\u003C\u002Fp>","2021-02-04T19:51:52Z",{"login":521,"avatar_url":522,"html_url":523},{"url":557,"total_count":514,"+1":514,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F773563957\u002Freactions",{"id":559,"html_url":560,"body_html":561,"created_at":562,"updated_at":563,"author_association":507,"user":564,"reactions":565},774326481,"https:\u002F\u002Fgithub.com\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002F53#issuecomment-774326481","\u003Cp>FYI, I updated my stack overflow answer \u003Ca rel=\"nofollow noopener noreferrer\" target=\"_blank\" href=\"https:\u002F\u002Fstackoverflow.com\u002Fa\u002F66067418\u002F166231\">here\u003C\u002Fa>.  But to make this work with Swagger (maybe other clients as well), I had to put the following:\u003C\u002Fp>\n\u003Cdiv>\u003Cpre>\u003Ccode>responseHeaders.CacheControl = new Microsoft.Net.Http.Headers.CacheControlHeaderValue\n{\n\tPublic = true,\n\tMustRevalidate = true,\n\tMaxAge = new TimeSpan( 0, 0, 0 ),\n};\nresponseHeaders.Expires = DateTime.UtcNow;\n\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>","2021-02-05T22:38:56Z","2021-02-05T22:39:16Z",{"login":521,"avatar_url":522,"html_url":523},{"url":566,"total_count":514,"+1":514,"-1":4,"laugh":4,"hooray":4,"confused":4,"heart":4,"rocket":4,"eyes":4},"https:\u002F\u002Fapi.github.com\u002Frepos\u002FRehanSaeed\u002Frehansaeed.github.io\u002Fissues\u002Fcomments\u002F774326481\u002Freactions","2017-10-20T00:00:00+00:00",null,"How to use and implement Cache-Control, Cache-Control Immutable, E-Tag, Last-Modified and If-Modified-Since Caching HTTP headers in ASP.NET 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