const char* host_name="221.123.68.59:3100";
char* req="POST /firstisapi/firstisapi.dll?UPLoadDATA HTTP/1.0\r\n"
"From: local\r\n"
"User-Agent: post_test/1.0\r\n"
"Content-Type: application/x-www-form-urlencoded\r\n"
"Content-Length: 4\r\n\r\n"
"dddd";
修改这个头就行了