cannot find content-encoding in my program   

I use: 
HttpQueryInfo(hRequest, HTTP_QUERY_RAW_HEADERS_CRLF, 
(LPVOID)&ContentInfoBuffer, &szContentInfoBuffer,NULL);
to fetch the response header, it seems processed correctly.
Then I use httpwatch to do a comparsion. When I test the same request using 
Httpwatch, I found "content-encoding:gzip" is not displayed in my programs, 
and only this one seems missing.
Also, the content-length displayed in my program in different from that in 
Httpwatch. Is it somthing related to content encoding or decoding?

date: Wed, 27 Aug 2008 05:51:00 -0700   author:   koroppo