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    <p>I'm not sure I can answer your question since I have no Pocket IE to test with, but maybe I can offer something that can help.</p> <p>This is a very good caching reference: <a href="http://www.mnot.net/cache_docs/" rel="nofollow noreferrer">http://www.mnot.net/cache_docs/</a></p> <p>Also, I'm not sure whether your example is the pasted <em>results</em> of your headers, or the code that you've set up to send the headers, but I believe the collection of headers in most language implementations (and by extension I assume most browser implementations) is treated as a map; therefore, it's possible you've overwritten "no-store, no-cache, must-revalidate" with the second "Cache-Control" header. In other words, only one can get sent, and if last wins, you only sent "post-check=0, pre-check=0".</p> <p>You could also try adding the max-age=0 header.</p> <p>In my experience both Firefox and IE have seemed more sensitive to pages served by HTTPS as well. You could try that if you have it as an option.</p> <p>If you still have no luck, and Pocket IE is behaving clearly differently from Windows IE, then my guess is that the handheld has special rules for caching based on the assumption that it will often be away from internet connectivity.</p> <p><strong>Edit:</strong> After you mentioned CNN.com, and I realized that you do not have the "private" header in Cache-Control. I think this is what is making CNN.com cache the page but not yours. I believe "private" is the most strict setting available in the "Cache-Control header. Try adding that.</p> <p>For example, here are CNN's headers. (I don't think listing "private" twice has any effect)</p> <pre><code>Date: Fri, 31 Jul 2009 16:05:42 GMT Server: Apache Accept-Ranges: bytes Cache-Control: max-age=60, private, private Expires: Fri, 31 Jul 2009 16:06:41 GMT Content-Type: text/html Vary: User-Agent,Accept-Encoding Content-Encoding: gzip Content-Length: 21221 200 OK </code></pre> <p>If you don't have the <a href="https://addons.mozilla.org/en-US/firefox/addon/60" rel="nofollow noreferrer" title="Firefox Web Developer Toolbar">Firefox Web Developer Toolbar</a>, it's a great tool to check Response Headers of any site - in the "Information" dropdown, "View Reponse Headers" is at the bottom.</p>
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    1. COThanks for the notes. Just wanted to say that I had copied the headers from my PHP code and 'tweaked away' the PHP code. Hence the incorrect headers: I've edited the post and copied in an exact copy of the headers (as far as Firefox is concerned, anyway). Just wanted to let you know that: I'm off to read that link and try the max-age header, too, thanks.
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    2. COIn case Pocket IE is implementing some funny rule, it's possible that because it sees the presence of "Last-Modified" it assumes it CAN cache the page for some amount of time. You could try removing it altogether and eliminating the chance that Apache could return a 304 Not Modified. It seems according to the following link that this is meant to tell browsers to always simply obey the Expires header. http://www.askapache.com/htaccess/apache-speed-last-modified.html
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    3. COMore information: have tried the max-age headers, as well as removing the last-modified header. Still no dice. The annoying thing is that when they visit cnn.com (for example) the handheld doesn't cache the pages, so I'm starting run out of ideas :(
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