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Subject DO NOT REPLY [Bug 46678] New: Fixed Content-Length using mod_ext_filter with mode=input
Date Mon, 09 Feb 2009 12:49:31 GMT

           Summary: Fixed Content-Length using mod_ext_filter with
           Product: Apache httpd-2
           Version: 2.2.10
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mod_ext_filter

I wrote an input filter using mod_ext_filter. In the filter "implementation" I
get the post data (from stdin) and modify it (to stdout) with no issues.
However, after changing the post data, the Content-Length of the request still
has the original value. For instance:

Original post data: param1=12345 with Content-Length: 12 
Post data after filter: param1=abcdefghij with Content-Length: 12

Then because the Content-Length is not changed, when the request post data is
received after the filter, it will be truncated to the original Content-Length
size (i.e. would get param1=abcde in the previous example).

The filter implementation is a Java program (speed is not an issue), and this
how the filter definition looks:

ExtFilterDefine filtername mode=input cmd="/path_to_java/java.exe -classpath

As you can see, I am not using the PreservesContentLength flag. Also, this is
running on Windows XP, and using Apache 2.2.10 (I already verified and 2.2.11
does not mention anything like this in the release notes). I also tried setting
the Content-Length using mod_headers but this cause another problem (would
completely remove the post data). 

I am reporting this as a bug, as supposedly not using the
PreservesContentLength flag should let the filter change the Content-Length.

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