HTTP_USER_AGENT
host, port, host, port, cookie, HTTP_USER_AGENT);
host, port, host, port, HTTP_USER_AGENT);
httpuseragent = HTTP_USER_AGENT;
"User-Agent: " HTTP_USER_AGENT "\r\n%s\r\n", host, host,
"User-Agent: " HTTP_USER_AGENT "\r\n"