自各儿写了一个socket向Live555的RTSP发送消息，为什么没有回应？麻烦大家帮看下

自己写了一个socket向Live555的RTSP发送消息，为什么没有回应？麻烦大家帮看下

#include "stdafx.h"
#include   <winsock2.h>   
#include   <winbase.h>   
#include   <iostream>  

#pragma   comment(lib,   "ws2_32.lib")  

#define   PORT   554  

void main(void)   
{
        WORD         wVersionRequested;   
        WSADATA   wsaData;   
         
        int           err;   

        wVersionRequested   =   MAKEWORD(2,   2);   

        err   =   WSAStartup(wVersionRequested,   &wsaData);   
        if(err   !=   0)     
        {   
                return;   
        }   

        if(LOBYTE(wsaData.wVersion)   !=   2   ||   HIBYTE(wsaData.wVersion)   !=   2)     
        {   
                WSACleanup();   
                return;     
        }   


        SOCKET   sock;   
        sock   =   socket(AF_INET,   SOCK_STREAM,   0);
        struct   sockaddr_in     server;   

        server.sin_family =   AF_INET;   
        server.sin_port =   htons(PORT);   
        server.sin_addr.S_un.S_addr   =   inet_addr("192.168.10.177");   

        int   nConnect;     

        nConnect   =   connect(sock,   (struct   sockaddr   FAR*)&server,   sizeof(struct   sockaddr_in));   
        if(nConnect   ==   SOCKET_ERROR)   
        {   
                int   erro   =   WSAGetLastError();   

                printf("connect   fail   !");

                Sleep(3000);     

                closesocket(sock);   
                WSACleanup();     
                return;     
        }   

        char   buffer2[1000] = "DESCRIBE rtsp://192.168.10.177/bipbop-gear1-all.ts RTSP/1.0"
                                                        "CSeq: 2"
                                                        "User-Agent: testRTSP (LIVE555 Streaming Media v2012.02.29)"
                                                        "Accept: application/sdp";
        
        int   nSend = 0; 
        nSend   =   send(sock,   buffer2,   sizeof(buffer2),   0);   

        if(nSend   ==   SOCKET_ERROR)   
        {   
                printf("send   fail   !"); 
                Sleep(3000);   
                return   ;     
        }

        printf("Send MSG success:  %s",buffer2);

        //Sleep(1000);

        char   buffer[1024];   
        int     nAmount;   

        nAmount   =   recv(sock,   buffer,   sizeof(buffer),   0);   
        if(nAmount   ==   SOCKET_ERROR)   
        {   
                closesocket(sock);   
                WSACleanup();     

                return   ;     
        }   
        printf("Recv MSG success:  %s",buffer);
        //std::cout<<buffer<<std::endl;     
        Sleep(3000);   

        closesocket(sock);   
        WSACleanup();     
}

[解决办法]
貌似应该先发OPTION请求才行。你可以看下live555服务器模块的源码，看了比较有概念。不过源码很复杂，需求不大的话，看个大概就好啦~
[解决办法]
客户端发送请求顺序OPTIONS——>DESCRIBE——>SETUP——>PLAY——>TEARDOWN