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The other approach is to set the date time of your response to a point in the future. I believe all browsers will correct this to the current time when they add the page to the cache, but it will show the page as newer when the comparison is made. First of all, this question and answer are targeted on “web pages” (HTML pages), not “file downloads” (PDF, zip, Excel, etc). When applying those no-cache headers https://hack.allmende.io/i1oxGxAaRyaTeRrZ2J2sUQ/ on file downloads anyway, then beware of the IE7/8 bug when serving a file download over HTTPS instead of HTTP. I’m after a definitive reference to what ASP.NET code is required to disabled browsers from caching the page.

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The meta cache control tag allows Web publishers to define how pages should be handled by caches. This goes in your root .htaccess file but if you have access to httpd.conf that is better. It’s safer to redirect from an Action or don’t clear headers when redirection is taking place.

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This is effective in making the browser ask for the resource again but doesn’t really prevent caching. That covers about 99% of all browsers in use as of Jan ’10. Aside from performance, there is a behavior difference with browser history. Thus, the user can navigate backward to a previous page with no-cache without the server being contacted.

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• Don’t waste your time reinventing the wheel, use the nocache middleware instead.
• On IE6, and Opera 9-10, hitting the back button still caused the cached version to be loaded.
• Setting the Response to no cache takes care of that, however as you suspect the browser will often ignore this directive.

As you identified, no-cache doesn’t mean there is never caching, but rather that the user agent has to always ask the server if it’s OK to use what it cached. You should be aware that resources can also be cached in between the server and client. The good news is that they typically cache for shorter time frames, like seconds or minutes. I found that all of the answers on this page still had problems. Different browsers have their own subtle ways to disable the history buffer.

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On IE6, and Opera 9-10, hitting the back button still caused the cached version to be loaded. On all other browsers I tested, they did fetch a fresh version from the server. The first is to tell the browser not to cache the page. Setting the Response to no cache takes care of that, however as you suspect the browser will often ignore this directive.

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It’s generated at the end of the request and could be another source of unintended caching. You should always use a real HTTP header for headers such as Cache-Control and Pragma. Secondly, many Stockholmers prefer taking the subway or bus, to driving a car in the city. Until you do so, your browser will keep the old cached version, and won’t refresh it with a “normal refresh” (F5).

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These are completely outdated when using modern up to date browsers.After IE9 anyway.

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