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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 51434] New: Unable to use (forward) slashes in a FilterProvider regex
Date Sat, 25 Jun 2011 11:22:13 GMT
https://issues.apache.org/bugzilla/show_bug.cgi?id=51434

             Bug #: 51434
           Summary: Unable to use (forward) slashes in a FilterProvider
                    regex
           Product: Apache httpd-2
           Version: 2.2.17
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mod_filter
        AssignedTo: bugs@httpd.apache.org
        ReportedBy: rros@robertros.nl
    Classification: Unclassified


For example the following FilterProvider will cause an internal server error.
("Bad regexp" in the error_log)

FilterDeclare  COMPRESS
FilterProvider COMPRESS DEFLATE resp=Content-Type /text\/(html|css)/
FilterChain    COMPRESS
FilterProtocol COMPRESS change=yes;byteranges=no

After looking at the actual code (My c/c++ knowledge is only limited) it seems
the second (forward) slash is always the delimiter of the regex, even when it's
escaped. Then it tries to parse the regex 'text\', this is indeed a bad regexp. 
http://svn.apache.org/viewvc/httpd/httpd/branches/2.2.x/modules/filters/mod_filter.c?view=markup#l577

So it seems it's impossible to use a forward slash in a FilterProvider regex.

I found out about this issue while looking at the usage of mod_filter in
html5boilerplate. For more information see this issue:
https://github.com/paulirish/html5-boilerplate/issues/549#issuecomment-1330675

I tested this using Apache/2.2.17 on Ubuntu 11.04

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