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POFull page reload on Post/Redirect/Get ignoring cache control
 

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  1. POFull page reload on Post/Redirect/Get ignoring cache control
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    <p>I have a page that loads a lot of images, css and javascript. I've added a far future Expires header and set Cache-Control to public on these external dependencies so they should be cached. But every time I do a Post/Redirect/Get chrome tries to load these again. This behavior is very similar to reloading the page. I've added ETags and handle the If-None-Match header which helps a bit, but it still generates too many useless requests.</p> <p>How do I tell chrome and safari to get the files from cache?</p> <pre><code>chrome NOK safari NOK firefox OK ie OK </code></pre> <p>Also see <a href="http://www.google.com/support/forum/p/Chrome/thread?tid=72bf3773f7e66d68" rel="nofollow noreferrer">Full page reload on Post/Redirect/Get ignoring cache control</a> on the google support forum.</p> <p><strong>Clarification:</strong></p> <p>I don't want the browser to request <code>image1.png</code> twice. It should be cached.</p> <pre><code>200 GET page1.html 200 GET image1.png (Cache-Control: public, Expires and ETag) 302 POST action.asp (form submitted from page1.html, redirects) 200 GET page2.html 304 GET image1.png (If-None-Match) </code></pre> <p><strong>Example:</strong></p> <p>I've created a simple example to illustrate the problem.</p> <p><a href="http://crydust.be/lab/prg/" rel="nofollow noreferrer">http://crydust.be/lab/prg/</a></p> <p><strong>Headers:</strong></p> <p>The headers I send with the image are:</p> <pre><code>HTTP/1.1 200 OK Date: Fri, 18 Jun 2010 11:30:22 GMT Server: Apache Cache-Control: public, max-age=86400 Expires: Sat, 19 Jun 2010 11:30:24 GMT Etag: "123" Content-Length: 866 Content-Type: image/png </code></pre> <p>Which should make it cached for 24 hours. There is no Vary: * or anything like that.</p> <p><strong>Update:</strong> This behavior is now also present in Safari Mobile on iOS 4. A horible regression in page-load speed.</p> <p><strong>Update:</strong> There is a bugreport about this issue in the webkit bugzilla. <a href="https://bugs.webkit.org/show_bug.cgi?id=38690" rel="nofollow noreferrer">Bug 38690 - Submitting a POST that leads to a server redirect causes all cached items to redownload</a></p> <p><strong>Update:</strong> The problem persists on iOS 4.0.1</p> <p><strong>Update:</strong> The problem persists on iOS 4.1</p> <p><strong>Update:</strong> The problem persists on iOS 4.2</p> <p><strong>Update:</strong> The problem persists on iOS 4.2.1 and in Chrome from version 6 till 9.</p> <p><strong>Update:</strong> There is a bugreport about this issue in the Chromium project. (you can star it to show you care) <a href="http://code.google.com/p/chromium/issues/detail?id=68621" rel="nofollow noreferrer">Issue 68621: Post/Redirect/Get ignoring cache instructions</a> </p> <p><strong>Update:</strong> The problem persists on Chrome from version 6 till 10. It is now a 9 months old bug.</p> <p><strong>Update:</strong> The problem is fixed as of 2011-03-21 19:33:07 PST. This is reflected in the behavior of chrome 12 (canary).</p>
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    1. COIt's a webkit issue, rather than a specific problem with Chrome itself.
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      1. USDan Atkinson
    2. CO@Dan, I know, but I expect the google guys to fix this in one of their many releases. There is a patch available, but it isn't included in chrome yet.
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      1. USKristof Neirynck
    3. COI thought that the patch caused a regression, which is why it wasn't accepted?
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