REQMOD icap://127.0.0.1/req?arg=87 ICAP/1.0
Host: 127.0.0.1
Encapsulated: req-hdr=0, req-body=155

POST /origin-resource/form.pl HTTP/1.1
Host: www.origin-server.example.com
Accept: text/html, text/plain
Accept-Encoding: compress
Pragma: no-cache