And the page is used in appropriate situations without contacting the remote Web server, such as: However, the page remains in the disk cache (Temporary Internet Files). On future requests by the user, Internet Explorer usually contacts the Web server for updates to that page via a conditional If-Modified-Since request.
These pages should be marked by the server with a value of "-1" for the Expires header. In many cases, Web servers have one or more volatile pages on a server that contain information that's subject to change immediately. Pages that aren't expected to change should be marked with an expiration date of approximately one year. When it's done, the browser doesn't need to contact the Web server again until the page has changed. The Web server for this news page should return an Expires header with a value for 5 A.M. Take, for example, a daily news page on the Internet that is updated every day at 5 A.M. When pages are updated regularly, the next period for update is the most efficient response. Most browsers and intermediate proxies today respect this expiration information and use it to increase the efficiency of communications over the network.Īlways use the Expires header to specify the most reasonable time when a particular file on the server needs to be updated by the client. It's a bad practice for a Web server not to supply expiration information via the HTTP Expires response header for every resource returned to requesting clients.
It's highly recommended that all Web servers use a scheme for the expiration of all Web pages. You can use Microsoft Internet Information Server (IIS) to easily mark highly volatile or sensitive pages using the following script at the extreme beginning of the specific Active Server Pages (ASP) pages: Original product version: Internet Explorer Original KB number: 234067 Summary This article describes the use of HTTP headers to control the caching of Web pages in Internet Explorer. The same IE11 apps and sites you use today can open in Microsoft Edge with Internet Explorer mode.
The Internet Explorer 11 desktop application will be retired and go out of support on J(for a list of what's in scope, see the FAQ).
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