338176 - Non-cacheable url request turns into two requests to the web server

Status: RESOLVED DUPLICATE of bug 304574

(Core :: Networking: HTTP, defect)

Description

[Bob van Manen]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.3) Gecko/20060502 Firefox/1.5.0.3
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.3) Gecko/20060502 Firefox/1.5.0.3

When I request a non-cacheable url typed in from the address bar or refered from inside an html page Firefox will re-request the same url. This bug has been in since Firefox 1.5 was released. The url response does seem to show when the first request is finished. 

The following are the response headers of one such request:

Server: Apache-Coyote/1.1
Cache-Control: no-store
Pragma: no-cache
Content-Type: image/jpeg
Content-Length: 27110
Date: Tue, 16 May 2006 18:36:07 GMT

200 OK

Reproducible: Always

Steps to Reproduce:
1. Type in non-cacheable url in address bar
2. Look at server logs
3. Observe two requests to the server

Actual Results:  
There are two requests for the same url in the server logs. 

Expected Results:  
Just one request should've been enough to download the url.

Comment 1

[Philip Withnall (unavailable)]

Related to/dupe of bug #236858?
Could you provide an URL which demonstrates this please?

Comment 2

[Bob van Manen]

Attachment: HTTP log of firefox showing the problem.

This is the HTTP log from Firefox showing that Firefox is requesting two copies of the same url. 

I can't give you a url to try yourself since this is a Tomcat server running on my local box.

Comment 3

[Christian :Biesinger (don't email me, ping me on IRC)]

do you charset detection enabled? (view|character encoding|autodetect)

Comment 4

[Phil Ringnalda (:philor)]

Loading an image directly? Seems unlikely to be charset detection, and likely to be using the image as the tab favicon. Does the second request go away if you toggle browser.chrome.favicons to false (in about:config)?

Comment 5

[Micha D]

BUG confirmed by my collegue and me

to reproduce:
- create a php script that writes (a timestamp) to a file and returns a jpg/gif file via readfile
- call this php script via http from your mozilla (firefox 1.5) browser
- you will find two entries in the file instead of one

Comment 6

[Bob van Manen]

Actually Phil Ringnalda was pretty close. When I toggle browser.chrome.site_icons to false (and leave browser.chrome.favicons alone) there is only one request in my Tomcat logs.

Comment 7

[Philip Withnall (unavailable)]

*** Bug 341411 has been marked as a duplicate of this bug. ***

Comment 8

[jja]

Attachment: tar file with example code to duplicate problem

fyi, here is my example code from bug #341411

Comment 9

[Phil Ringnalda (:philor)]

*** This bug has been marked as a duplicate of 304574 ***