phr_parse_headers is not working

[naushadck]

Hello,

Used the phr_parse_headers in the similar way of phr_parse_request.
phr_parse_request works fine. Where as the phr_parse_headers returns -1.
Code is given below.

num_headers = sizeof(headers) / sizeof(headers[0]);
ret = phr_parse_headers(REQ, strlen(REQ), headers, &num_headers, 0);

Any suggestions. Thanks....