134766 - Odd form of advertising breaks image loading

Status: VERIFIED DUPLICATE of bug 121084

(Core :: Graphics: ImageLib, defect)

Description

[Blu3]

Short and simple: click on one of these flag images, we'll call it japan.gif.

Result:
  Moz requests japan.gif
  Server sends japan.gif (really a gif)
  Moz requests japan.gif
  Server sends japan.gif (actually a jpeg, an ad)
  Moz renders ad

Forced network load of image:
  Moz requests japan.gif
  Server sends japan.gif (really the gif)
  Moz renders the flag image we are expecting

Tcpdump shows the following conversation happening:

GET /avmedia6/flags1/asia/oman.gif HTTP/1.1
Host: members.fortunecity.com
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.9+) Gecko/20020329
Accept:
text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,video/x-mng,image/png,image/jpeg,image/gif;q=0.2,text/css,*/*;q=0.1
Accept-Language: en-us, en;q=0.50
Accept-Encoding: gzip, deflate, compress;q=0.9
Accept-Charset: ISO-8859-1, utf-8;q=0.66, *;q=0.66
Keep-Alive: 300
Connection: keep-alive
Referer: http://www.virtuallandmedia.com/world-flag1.htm
Cookie: rand=1017257990-f45944da05219912a8058b1a89ba33b9;
fcfirstseen=1017258141-68.14.9.32-V-unknown; RMID=440e09203ca22000

HTTP/1.1 200 OK
Date: Tue, 02 Apr 2002 01:24:26 GMT
Server: Apache/1.3.14 (Unix)
Last-Modified: Thu, 28 Mar 2002 05:21:24 GMT
ETag: "286b6b-a1f3-3ca2a854"
Accept-Ranges: bytes
Content-Length: 41459
Keep-Alive: timeout=15, max=256
Connection: Keep-Alive
Content-Type: image/gif

GIF89a<image data>

GET /avmedia6/flags1/asia/oman.gif HTTP/1.1
Host: members.fortunecity.com
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.9+) Gecko/20020329
Accept:
text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,video/x-mng,image/png,image/jpeg,image/gif;q=0.2,text/css,*/*;q=0.1
Accept-Language: en-us, en;q=0.50
Accept-Encoding: gzip, deflate, compress;q=0.9
Accept-Charset: ISO-8859-1, utf-8;q=0.66, *;q=0.66
Keep-Alive: 300
Connection: keep-alive
Cookie: rand=1017257990-f45944da05219912a8058b1a89ba33b9;
fcfirstseen=1017258141-68.14.9.32-V-unknown; RMID=440e09203ca22000
If-Modified-Since: Thu, 28 Mar 2002 05:21:24 GMT
If-None-Match: "286b6b-a1f3-3ca2a854"
Cache-Control: max-age=0

HTTP/1.1 200 OK
Date: Tue, 02 Apr 2002 01:24:26 GMT
Server: Apache/1.3.14 (Unix)
Keep-Alive: timeout=15, max=255
Connection: Keep-Alive
Transfer-Encoding: chunked
Content-Type: image/gif

JFIF data

Now, when the forced reload happens, here is the conversation:

GET /avmedia6/flags1/asia/oman.gif HTTP/1.1
Host: members.fortunecity.com
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.9+) Gecko/20020329
Accept:
text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,video/x-mng,image/png,image/jpeg,image/gif;q=0.2,text/css,*/*;q=0.1
Accept-Language: en-us, en;q=0.50
Accept-Encoding: gzip, deflate, compress;q=0.9
Accept-Charset: ISO-8859-1, utf-8;q=0.66, *;q=0.66
Keep-Alive: 300
Connection: keep-alive
Referer: http://www.virtuallandmedia.com/world-flag1.htm
Cookie: rand=1017257990-f45944da05219912a8058b1a89ba33b9;
fcfirstseen=1017258141-68.14.9.32-V-unknown; RMID=440e09203ca22000
Pragma: no-cache
Cache-Control: no-cache

HTTP/1.1 200 OK
Date: Tue, 02 Apr 2002 01:47:45 GMT
Server: Apache/1.3.14 (Unix)
Last-Modified: Thu, 28 Mar 2002 05:21:24 GMT
ETag: "286b6b-a1f3-3ca2a854"
Accept-Ranges: bytes
Content-Length: 41459
Keep-Alive: timeout=15, max=254
Connection: Keep-Alive
Content-Type: image/gif

GIF89a <image data>

How should mozilla be reacting in the above circumstance? This is an issue I
have seen on 7 different websites today, all of them sending an advertisement
image with the requested image.

Comment 1

[Blu3]

I did forget to mention, I have my cache values set to load every time.

Comment 2

[Blu3]

Build 2002 0329 21 on Linux/686

Comment 3

[Bradley Baetz (:bbaetz)]

I can't reproduce this.on 099, but I don't have a nightly arround to test ATM.

The referer header is missing on the second load, though, which could be causing
this.

-> imglib, I guess

Comment 4

[Blu3]

a) Why is mozilla issuing two GET requests on the first load?
b) Why is mozilla rendering the JFIF content instead of the GIF content on the
first load?

Comment 5

[Blu3]

Further note, this effect is only noticed when Edit->Prefs->Adv->Cache is set to
Every Time.  All other cache forms show the expected image every time.

Comment 6

[Ben Ford]

Yikes!  I saw it too, it loads the flag, then quickly re-renders to a flippin
ad.  I didn't see it until I set the browser to load everytime.  That's just nasty.

Comment 7

[Sitsofe Wheeler]

Wacky. Confirming.

Comment 8

[Sitsofe Wheeler]

What I meant to put was confirming with 20020421 Linux...

Comment 9

[Blu3]

The situation appears to be discovered.  A growing number of websites are
blocking outside referrers and providing an advertisement or other content in
the place of the requested image.  I'm marking this bug a dupe of bug 121084.

It remains to be solved why mozilla wants to do two GETs.


*** This bug has been marked as a duplicate of 121084 ***

Comment 10

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

vrfy