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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 50935] New: Content-Encoding value returned by apache is malformed
Date Tue, 15 Mar 2011 17:39:11 GMT
https://issues.apache.org/bugzilla/show_bug.cgi?id=50935

           Summary: Content-Encoding value returned by apache is malformed
           Product: Apache httpd-2
           Version: 2.2.3
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mod_deflate
        AssignedTo: bugs@httpd.apache.org
        ReportedBy: dnessett@yahoo.com


This bug occurs on a site running the MediaWiki software and occurs for both MW
1.13.2 and 1.16.2. When a request to download a file is received, apache
returns a malformed Content-Encoding header value of ", gzip". This befuddles
some browsers (e.g., Safari, IE and Firefox), while others seem to silently
discard the leading comma (Opera and Chrome). The result is the file is
delivered to the host file system by the confused browsers in compressed form.
Since the site uses Squid, I confirmed that the problem also occurs when Squid
is bypassed.

Note: I attempted to read the bug writing help page
https://issues.apache.org/bugwritinghelp.html as I am a new bug reporter.
However, the link returns a 404 Not Found error. Here is some relevant
information that I can only suppose is useful:

Apache version: 2.2.3
PHP version: 5.3.5
OS: CentOS 5.5
Browser: various - example is for Firefox 3.6.13 running on Mac OS X 10.6.6

Here is the request and response headers (I have obscured some file and
cookie information using ellipses to ensure privacy - the output is from 
HTTPFox running on Firefox):

(Request-Line) GET /wiki?title=Special:ConfirmAccounts/
editors&file=to...v.pdf HTTP/1.1
Host  en.citizendium.org
User-Agent  Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; 
rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13
Accept   text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language   en-us,en;q=0.5
Accept-Encoding   gzip,deflate
Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive  115
Connection  keep-alive
Referer  http://en.citizendium.org/wiki?title=Special:ConfirmAccounts/
editors&acrid=...
Cookie   __utma=184949757....

(Status-Line)  HTTP/1.0 200 OK
Date  Wed, 09 Mar 2011 01:27:46 GMT
Server   Apache/2.2.3 (CentOS)
X-Powered-By   PHP/5.3.5
Expires  Thu, 01 Jan 1970 00:00:00 GMT
Cache-Control  no-cache, no-store, max-age=0, must-revalidate
Pragma   no-cache
Content-Disposition  inline;filename*=utf-8'en'to...v.pdf
Last-Modified  Tue, 08 Feb 2011 05:25:51 GMT
Content-Encoding  , gzip
Vary  Accept-Encoding
Content-Length 48636
Content-Type   application/pdf
X-Cache  MISS from aristotle.citizendium.org
X-Cache-Lookup MISS from aristotle.citizendium.org:80
Via   1.0 aristotle.citizendium.org:80 (squid/2.6.STABLE21)
Connection  keep-alive

Note that the Accept-Encoding header in the request specifies "gzip, deflate",
while the Content-Encoding value in the response is ", gzip". I posted a query
about the problem on
http://groups.google.com/group/comp.infosystems.www.servers.unix, but did not
receive a response. (I  posted the query over three weeks ago).

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