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Webmaster Forum / Browsers / Internet Explorer / January 2007IE7 and HTTPS -- pages are being cached when they shouldn't
I have an application that has been in production on ie6 for a while. It seems to run fine on ie7 except when it is used with https. The problem (after days of debugging) appears to be that occasionally, showModalDialog decides to cache the result of the previous showModalDialog instead of sending the request to the server. The application builds the pages dynamically, and all requests must be seen by the server in order to work correctly. The responses always have the "Cache-Control: no-cache" header, so I'm very suprised to see this happening. So...why is this happening? Is there something different about cache-control with https? Do I have to recode my application to ensure that all URLs are unique? I'd rather not. Help please. > So...why is this happening? Is there something different about > cache-control with https? So I've fixed the problem by adding more headers: Cache-Control: no-store,no-cache,must-revalidate,post-check=0,pre-check=0 Expires: 0 Pragma: no-cache I came across this list of headers when attempting to reproduce these problems using a simple php script on the server side. php seems to add all of these protective headers automatically. So, shouldn't a simple "Cache-Control: no-cache" have done the trick? Is this a bug in IE? or am I just not understanding the subtle meaning of these headers? BTW, I found the HTTP Analyzer by IE Inspector extremely helpful. Not only can I see the HTTPS requests and responses unencrypted, but it shows the requests that are never made when the browser decides to use its cache. It also shows the state of the cache before and after each request. This not only immediately confirmed my suspicions about IE's behavior, but also helped to easily confirm that the fix was working solidly. |
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