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mod_proxy dropping content length header

           Summary: mod_proxy dropping content length header
           Product: Apache httpd-2.0
           Version: 2.0.35
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Major
          Priority: Other
         Component: mod_proxy
        AssignedTo: bugs@httpd.apache.org
        ReportedBy: phillip.rhodes@alcoa.com

We are using mod_proxy to proxy pdf documents on an internal web server.

The mod_proxy with 2.x is not returning the content-length of the pdf. Using a 1.3 version of mod_proxy, to the same webserver, will return a contentlength  header.

Below is the headers for a 1.3 and a 2.0 apache version. Notice that the 2.x apache does not return a content length header, while the 1.3 does.

Request to a 2.0.35 apache
GET /msds2/documents/190252.pdf HTTP/1.1 Accept: text/html, text/css, text/xml, text/plain, application/csv, application/pdf, application/msword, application/vnd.ms-excel, application/xvbscript,  application/x-www-form-urlencoded, application/x-javascript Accept-Language: en_us
Host: acadv04.ami.alcoa.com:16888
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0) Connection: Close

Response:
HTTP/1.1 200 OK
Date: Tue, 30 Apr 2002 16:24:38 GMT
Server: Microsoft-IIS/5.0
Content-Type: application/pdf
Accept-Ranges: bytes
Last-Modified: Tue, 31 Oct 2000 04:00:00 GMT ETag: "0e012aef42c01:7e8"
Connection: close
Transfer-Encoding: chunked

81f5
%PDF-1.3

...etc...

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Request to a 1.3 apache  

GET /msds2/documents/190252.pdf HTTP/1.1 Accept: text/html, text/css, text/xml, text/plain, application/csv, application/pdf, application/msword, application/vnd.ms-excel, application/xvbscript,  application/x-www-form-urlencoded, application/x-javascript Accept-Language: en_us
Host: acadv04.ami.alcoa.com:7380
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0) Connection: Close

Response:
HTTP/1.0 200 OK
Server: Microsoft-IIS/5.0
Date: Tue, 30 Apr 2002 16:08:14 GMT
Content-Type: application/pdf
Accept-Ranges: bytes
Last-Modified: Tue, 31 Oct 2000 04:00:00 GMT ETag: "0e012aef42c01:7e8"
Content-Length: 84348

%PDF-1.3

...etc...