Front Query:
CONNECT domain.com@[host_port][crlf]HEAD http://domain.com/ [protocol][crlf]Host: domain.com[crlf][crlf]
⏬Back Query:
CONNECT [host_port]@domain.com[crlf]HEAD http://domain.com/ [protocol][crlf]Host: domain.com[crlf][crlf]
⏬Filter:
CONNECT [host_port] [protocol][crlf]Host...