518081 - Firefox gives a 404 ("file not found") error page for 400 ("bad request") HTTP errors

Status: RESOLVED INCOMPLETE

(Core :: Networking: HTTP, defect)

Description

[Gervase Markham [:gerv]]

HTTP has a wide range of error codes for a range of reasons. 400 is not the same as 404, and the error shown should not be talking about files being missing.

Steps to reproduce: well, I have a web app I'm developing which can return 400 errors. I'm not sure where else on the web you can find one. Try sending bogus parameters to a RESTful web service... :-)

Gerv

Comment 1

[Zack Weinberg (:zwol)]

I just tripped over this one myself with a web app I'm developing.  Not only do you get an error page that makes no sense, but Firebug can't see the response entity-body, which is all kinds of no fun when what you want is to know whether your JSON-encoded detailed error report is being produced as intended.

Changing the Content-Type on the response from application/json to text/plain makes the entity-body show up in the browser, though.

Possibly this bug belongs in the component that displays the friendly error pages, instead of Networking:HTTP?

Comment 2

[PabloBM]

Just ran across this one. Developing a web app myself, and this bug made it confusing to realise what problem a user was actually having.

Comment 3

[Aakash Desai [:aakashd]]

Attachment: bug screenshot

I'm seeing this too while viewing two sites: logging into camino.scu.edu (school site) and looking at a blank invite e-mail.

Comment 4

[Aakash Desai [:aakashd]]

Also, seen by users via Input: http://input.mozilla.com/en-US/search/?product=firefox&q=file+not+found

Comment 5

[juan becerra [:juanb]]

I can reproduce this frequently if I visit https://mail.mozilla.com/zimbra/public/blank.html. When it happens I can shift reload and get a blank page. When the error page is shown there's nothing in the Web Console, otherwise there are entries like this:

09:00:55.630: Network: GET https://mail.mozilla.com/zimbra/public/blank.html [HTTP/1.1 200 OK 34ms]

I haven't been able to get this error page on Linux, and I haven't been able to reproduce the error page on Chrome, for example.

Comment 6

[juan becerra [:juanb]]

Adding to comment #5, I can see this reliably on Mac with 4.0b8pre (10/12)

Comment 8

[juan becerra [:juanb]]

It could be a dupe of bug 588804, at least from comment #3 on.

Comment 9

[Patrick McManus [:mcmanus]]

no activity for a long time.. going to assume this is a dup of comment 7 or 8