mod-perl - read

[Siva Yendapalli]

I am totally a newbie to mod_perl. I could able to get the content length using $r->headers_in("Content-Length"). but I don't see anything in the $buf when I call the function $r->read($buf,$r->headers_in("Content-Length")). I am sure I am doing some thing wrong with the configuration or with mod_perl program. Please can some body give me an example and what I should do with the configuration to load the program.   Thanks Si