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From PMilan...@nypl.org
Subject RE: [users@httpd] Web server corrupting image?
Date Thu, 09 Jun 2005 11:59:34 GMT
Open the file, save it as another name, and try it again. The header may be corrupt or something.
While many graphics apps overlook that stuff, I do not think browsers are smart enough to
do so. I assume you are sure that it is a .gif, because if not it could just be a mime issue.



-----Original Message-----
From: cdunigan@doit.wisc.edu [mailto:cdunigan@doit.wisc.edu] 
Sent: Wednesday, June 08, 2005 5:30 PM
To: users@httpd.apache.org
Subject: Re: [users@httpd] Web server corrupting image?

Can you verify that bad.gif begins with the string 'GIF'?  Can it be viewed in 
an app on the server itself?  If the files are truly identical (one is a copy of 
the other), just a diff will report that - does it?

Are you sure there are no leftover PerlHandler or SetHandler or similar
statements in httpd.conf?

I find it very odd to see actual perl source code in a served file, just because 
mod_perl is configured.  Was there anything unusual about the compilation of 
Apache or mod_perl on this server?


On Wed, 8 Jun 2005, Andres Monroy-Hernandez wrote:

> Sorry I was doing some changes. The URLs are back.
> 
> Craig Dunigan wrote:
> 
> >Same URL?  'Cause I get a 404 on bad.gif now.
> >
> >On Wed, 8 Jun 2005, Andres Monroy-Hernandez wrote:
> >
> >  
> >
> >>Good catch. I do have mod_perl enabled, but the images are real files, 
> >>not images served by a mod_perl application.
> >>I restarted apache and removed the configuration elements of mod_perl. I 
> >>still get the same problem. Now, when looking at the response I no 
> >>longer see the perl code, but still the browser can't understand it.
> >>
> >>Craig Dunigan wrote:
> >>
> >>    
> >>
> >>>I'm guessing that you are using a mod_perl handler to serve these, and it's
> >>>going wrong on the second one.  I opened it in vim and got this:
> >>>
> >>>dDate(">=",2003,31,1)^@^Mjkey=00130779^B5^DõA^B^B^B^A^@aØ^^^Døï^QJø^Ge^@^@p<97>~hòd^@^@q<97>~hòd^@^@^L954925515513

> >>>$obj->parsedDate(">=",2003,27,1)^@^Mjkey=00004348^B5^DõA^B^B^B^A^@aØ^^^Døð^QJø^Ge^@^@p<97>~hòd^@^@q<97>~hòd^@^@^L954925269341

> >>>$obj->parsedDate(">=",2003,32,1)^@^Mjkey=00008843^B5^DõA^B^B^B^A^@aØ^^^DøÙ^UJø^Ge^@^@p<97>~hòd^@^@q<97>~hòd^@^@^L954925516554

> >>>$obj->parsedDate(">=",2000,38,1)^@^Mjkey=00003088^B5^DõA^B^B^B^A^@aØ^^^DøÚ^UJø^Ge^@^@p<97>~hòd^@^@q<97>~hòd^@^@^L954925517577

> >>>$obj->parsedDate(">=",1999,26,1)^@^Mjkey=00023172^B5^DõA^B^B^B^A^@aØ^^^DøÛ^UJø^Ge^@^@p<97>~hòd^@^@q<97>~hòd^@^@^L954925517584

> >>>$obj->parsedDate(">=",2001,21,1)^@^Mjkey=00002881^B5^DõA^B^B^B^C^@d^@Ø^^^DøÜ^UJø^Ge^@^@p<97>~hòd^@^@q<97>~hòd^@^@^O110978978737417

> >>>$obj->parsedDate(">=",2000,14,1)^@^Mjkey=00133570^B5^DõA^B^B^B^A^@aØ^^^DøÝ^UJø^Ge^@^@p<97>~hòd^@^@q<97>~hòd^@^@^L
> >>>
> >>>Looks like perl code to me, like maybe you're serving an un-dereferenced
code 
> >>>ref?
> >>>
> >>>On Wed, 8 Jun 2005, Andres Monroy-Hernandez wrote:
> >>>
> >>> 
> >>>
> >>>      
> >>>
> >>>>Hello,
> >>>>
> >>>>I have two identical images (gifs). One is displayed correctly, the 
> >>>>other one not. I hope you can provide any hints.
> >>>>
> >>>>In order to make sure both files are identical I compared their 
> >>>>hexadecimal fingerprint by doing:
> >>>>
> >>>>% od good.gif > good.hex ; od bad.gif > bad.hex; diff bad.hex good.hex
> >>>>
> >>>>I checked the HTTP headers for both images and everything looks fine

> >>>>looks fine: Content-Type and Content-Length are the same.
> >>>>The Etag is different, but I believe this is normal.
> >>>>
> >>>>The good one:
> >>>>---------------------------
> >>>>Response Headers - http://openurl.uquebec.ca:3210/sfxctrl/pix.1.0/good.gif
> >>>>Date: Wed, 08 Jun 2005 17:02:08 GMT
> >>>>Server: Apache/2.0.52 (Unix) mod_ssl/2.0.52 OpenSSL/0.9.7e DAV/2
> >>>>Last-Modified: Sun, 13 Jun 2004 08:44:09 GMT
> >>>>Etag: "1540fa-2a8-f9d9e840"
> >>>>Accept-Ranges: bytes
> >>>>Content-Length: 680
> >>>>Keep-Alive: timeout=15, max=99
> >>>>Connection: Keep-Alive
> >>>>Content-Type: image/gif
> >>>>
> >>>>200 OK
> >>>>---------------------------
> >>>>
> >>>>
> >>>>The bad one:
> >>>>---------------------------
> >>>>http://openurl.uquebec.ca:3210/sfxctrl/pix.1.0/bad.gif
> >>>>Date: Wed, 08 Jun 2005 17:00:48 GMT
> >>>>Server: Apache/2.0.52 (Unix) mod_ssl/2.0.52 OpenSSL/0.9.7e DAV/2
> >>>>Last-Modified: Sun, 13 Jun 2004 08:44:09 GMT
> >>>>Etag: "154056-2a8-f9d9e840"
> >>>>Accept-Ranges: bytes
> >>>>Content-Length: 680
> >>>>Keep-Alive: timeout=15, max=100
> >>>>Connection: Keep-Alive
> >>>>Content-Type: image/gif
> >>>>
> >>>>200 OK
> >>>>
> >>>>---------------------------
> >>>>
> >>>>
> >>>>Thanks in advance.
> >>>>


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