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PODoes Firefox cache javascript and use it without a request if there is a querystring in the path?
 

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  1. PODoes Firefox cache javascript and use it without a request if there is a querystring in the path?
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    <p>What I would like to do is append a query string on the end of the javascript path so that whenever my application is updated to a new version, the javascript is downloaded. As long as the query string is the same however, I want it to keep using the cached version without doing a http request to check to see if the script has changed.</p> <p>The way I am accomplishing this in PHP is to read from the CVS tag. When I am building the HTML to output, I read the CVS tag and use that to append to the end of the javascript path so that it creates a script tag that looks like this:</p> <pre><code>&lt;script src="javascript/messages/shipments.js?TPRSAPPS-DEV2_090828145712237-BRANCH" type="text/javascript"&gt;&lt;/script&gt; </code></pre> <p>As long as the app hasn't changed, the tag will stay the same and therefore the query string will also. The browser should cache the JS and not do a network request at all because the expire date is far future. Each time the app is updated, that query string will change and the browser should download it.</p> <p>This works great in IE8. My problem is with Firefox. Firefox caches the files, but the next time I load the page Firebug shows a 304 response, indicating that it still did a network request for the file and then found that it hadn't changed.</p> <p>So my question is, does firefox ignore the expires header and cache of javascript when there is a query string?</p> <p>Related: <a href="https://stackoverflow.com/questions/7372345/what-does-firefox-decide-not-to-cache">what does firefox decide not to cache?</a> Apparently Rails does something similar. But this doesn't answer my question.</p> <p>Here is the response I am getting back on this file:</p> <pre><code>https://appdev.prsx.net/~jhargett/PRSApps-Motorlog/javascript/menuReader.js?TPRSAPPS-DEV2_090828145712237-BRANCH-DIFFERENT HTTP/1.1 304 Not Modified Date: Mon, 03 Oct 2011 18:35:26 GMT Server: Apache/2.2.3 (Red Hat) Connection: close Etag: "179010-3f8-49a9a74334200" Vary: Accept-Encoding </code></pre> <p>The Cache tab in Firebug says:</p> <pre><code>Last Modified Mon Oct 03 2011 13:35:26 GMT-0500 (Central Daylight Time) Last Fetched Mon Oct 03 2011 13:35:26 GMT-0500 (Central Daylight Time) Expires Fri Oct 28 2011 18:33:31 GMT-0500 (Central Daylight Time) Data Size 345 Fetch Count 12 Device disk </code></pre>
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    1. USJon Hargett
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      1. USIgor Zinov'yev
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    1. COWhat do your HTTP response headers look like? That's what's important here.
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    2. CODoing a 304 is normal. Firefox will send a GET request for every resource on the page at least once, with an "if-modified-since" header. It's up to the server to reply with new content (200) or a not-modified 304.
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      1. PODoes Firefox cache javascript and use it without a request if there is a querystring in the path?
      1. USMarc B
    3. COIf the expires header is far future, it should do a request at all.
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      1. USJon Hargett
 

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