HTTP 304 Sometimes Throws "File Not Found" Error

RESOLVED INVALID

Status

()

Firefox
Untriaged
--
major
RESOLVED INVALID
3 years ago
3 years ago

People

(Reporter: Jerry Baker, Unassigned)

Tracking

Firefox Tracking Flags

(Not tracked)

Details

(Reporter)

Description

3 years ago
Firefox 30.0

For a long time I've been intermittently experiencing issues where various elements on commonly visited pages don't load, be it scripts, css, or images. When it's an image, right-clicking and selecting "View image" results in Firefox's 404 page. When it's a script the page functionality is commonly broken, and on internal intranet apps it wreaks havoc with company applications. Reload never fixes it and SHIFT+Reload always fixes it.

After some investigating with Wireshark I discovered that the issue arises sometimes when the server sends a 304 - NOT MODIFIED. For whatever reason Firefox sometimes interprets this as a 404 and the content isn't loaded.
I know this bug from older an Firefox version (unknown which one) but Firefox 30 is no longer supported and we have a complete new cache backend since FIrefox30.  Please test again with a supported version.
Status: NEW → RESOLVED
Last Resolved: 3 years ago
Resolution: --- → INVALID
(Reporter)

Comment 2

3 years ago
Unfortunately there's no way to get the security updates without a tin of super-annoying UI and functionality changes, do that's not going to happen.
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