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POCan't the browser just use its cache from prior ajax calls?
 

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  1. POCan't the browser just use its cache from prior ajax calls?
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    <p>I am trying to rely upon the browser cache to hold JSON data returned from AJAX calls in jQuery.</p> <p>Normal browser activity relies upon the browser cache all the time. Example: jpg and gif images are not refetched on a page reload.</p> <p>But when I try using jQuery getJSON ajax calls, I cannot seem to avoid fetching the data from the server.</p> <p>My returned headers look like this (confirmed with firebug):</p> <pre><code>Transfer-Encoding: chunked Date: Wed, 05 Aug 2009 02:55:39 GMT Content-Type: text/plain; charset=ISO-8859-1 Expires: Wed, 05 Aug 2009 03:55:39 GMT Cache-Control: max-age=3600 </code></pre> <p>Yet an immediate refresh of the page causes identical requests to hit the server.</p> <p>I've seen several postings about avoiding caching behavior, which isn't what I need. I've seen several postings about utilizing caching, but those all seem to rely upon saving data in the DOM. I want something that behaves just like cached images do during a page reload.</p> <p>Cant the browser just fetch it from it's own cache?</p> <p>--x--x--x--x UPDATE --x--x--x--</p> <p>Much to my disappointment, several respectable folks agree that this isn't just possible. Some even argue that it shouldn't be (which still baffles me).</p> <p>Stubburn to a fault, I tried the following:</p> <p>I set the Etag header on all outgoing pages I want to be cached (I pick a few choice URL arguments that represent the data I'm requesting and just use that for the Etag value)</p> <p>At the beginning of the next request, I simply check if the 'If-None-Match' header is in the request. If so, then the browser isn't caching the request like I wanted, so I sent a 304 Not Modified response.</p> <p>Testing shows that Firefox won't cache my request (but I can still avoid the 'fetch the expensive data' part of my cgi), while IE6 will actually cache it (and wont even attempt fetching back from the server).</p> <p>It's not a pretty answer, but it's working for me for now<br> (those pesty full-page refreshes of graph data wont be so slow or expensive now).</p> <p>(What? I'm running IE6! OMG! Oh look a squirrel!)</p>
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    1. COmaybe I need to use if-modified-since requests to convert these to HTTP 304 status codes?
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    2. COdarn, not even 'if-modified-since' headers being sent in request... so much for 304 approach
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    3. COI had some luck with setting Etag on initial request and returning 304 if 'If-None-Match' header exists on later requests.
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