fastcgi protocol parser
this repo is fork from lisachenko/protocol-fcgi and make some changes
FastCGI is an open extension to CGI that provides high performance for all Internet applications without the penalties of Web server APIs.
Many modern web-servers such as nginx, apache, lighthttpd, etc are communicating with PHP via FCGI. So, this protocol is well known and used in many applications. More detailed information about the protocol is available here here: http://www.fastcgi.com/devkit/doc/fcgi-spec.html