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    <p>The logic Firefox uses to decide whether to make a conditional GET given a cached response is like so:</p> <ol> <li>If there is a relevant Vary header, revalidate.</li> <li>If this request is supposed to be force-loaded from cache, do not revalidate.</li> <li>If this request has the "always validate" flag, revalidate.</li> <li>If this request has the "never validate" flag then revalidate only if this is a no-store response or SSL no-cache response.</li> <li>If the response status code is not cacheable or the response is no-cache or no-store or if the expiration time is before the Date of the response, revalidate.</li> <li>If there is a query paramater and the response does not have an explicit Expires or max-age, revalidate.</li> <li>If the response expiration time is in the past, revalidate (unless the "only revalidate once per session user preference is set").</li> </ol> <p>So for your case, there should not be a conditional GET, assuming you actually set expires or max-age information on your 200 response.</p> <p>That said, some of the tools that try to trace HTTP information for Firefox actually affect the revalidation behavior, so you may be running into that.</p> <p>I recommend creating a log following the steps in <a href="https://developer.mozilla.org/en/HTTP_Logging" rel="noreferrer">https://developer.mozilla.org/en/HTTP_Logging</a> which will incidentally tell you exactly why a conditional GET is being done, if you can find the right part of the log (search for "nsHttpChannel::CheckCache enter" for the logging from the function that implements the above logic).</p>
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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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    1. USBoris Zbarsky
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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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    1. COI found my answer based on this answer and Pointy's comment above. I re-examined my response header on the original non-cached (200) load. There was no explicit expire header! Even though Firefox's Cache tab was showing an expires date, it was not getting that from the HTTP header.
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      1. USJon Hargett
    2. CO@Jon the HTTP RFC defines a heuristic for determining expiration time based on the current time and the Date header. So yeah, you were running into item 6 above, which is just implementing http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.9 paragraph 2.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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