从远程服务器接收数据

Receiving data from remote server

本文关键字：数据 服务器      更新时间：2023-10-16

我在从远程服务器接收数据时遇到问题。似乎我可以向 http://www.google.com 等主机发送HTTP请求，但无法得到回复。我正在向主机发送格式如下的 HTTP 1.0 请求：

获取/HTTP/1.0
主持人：www.google.com
连接：关闭

以下是代理代码的一部分：

    //Parse Request Buffer
    HttpRequest req;
    req.ParseRequest(request.c_str(), request.length());
    //Format Data to be Sent:
    req.AddHeader ("Connection", "close");  // add connection close headers
    req.SetVersion ("1.0");                 // set http 1.0 flag
    char *requestBuf = new char [req.GetTotalLength()];
    req.FormatRequest(requestBuf);
    //Get host IP by name
    struct hostent *host;
    host = gethostbyname(req.GetHost().c_str());
    //Setup remote address structure
    struct sockaddr_in remoteAddr;
    remoteAddr.sin_family = AF_INET;     
    remoteAddr.sin_port = htons(req.GetPort());   
    remoteAddr.sin_addr = *((struct in_addr *)host->h_addr);
    //create new socket for remote server
    int remoteSock = socket(AF_INET, SOCK_STREAM, 0);
    if(remoteSock < 0)
    {
            perror("Socket Error");
            //return -1;
    }
    //connecting to remote server
    if(connect(remoteSock, (struct sockaddr *)&remoteAddr, sizeof(remoteAddr)) < 0)
    {
            perror("Connect Error");
            //return -1;
    }
    cout.flush() << requestBuf << endl;
    //send request to remote server
    if(send(remoteSock, requestBuf, sizeof(requestBuf), 0) < 0)
    {
            perror("Write Error");
            //return -1;
    }
    //receive reply from server
    char *recBuf = new char [1024];
    int bufSize = 1024;
    int readSize;
    while(1)
    {
            readSize = read(remoteSock, recBuf, bufSize);   //Read from Remote Server
            cout.flush() << recBuf << endl;
            if(readSize <= 0)       //If the requestBuf not filled, nothing left to send to client
                    break;
            write(clientSock, recBuf, readSize);            //write reply to Client
    }
    close(remoteSock);


recBuf 的 cout.flush（） 不输出任何内容。
对发生了什么有什么想法吗？

在此代码中：

if(send(remoteSock, requestBuf, sizeof(requestBuf), 0) < 0)

您只向远程端发送（可能）4 或 8 个字节。 requestBuf被声明为 char * ，这是一种指针类型。而不是 sizeof(requestBuf) ，您需要传递已构建的请求的实际长度，这在您的情况下似乎req.GetTotalLength()。

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