尝试通过 winsock 套接字连接到网站时收到 400 Bad Request

Getting 400 Bad Request when trying to connect to website via winsock socket

我制作了一个插座,现在已经慢慢添加了大约一个星期,但我遇到了一个问题。我在我的本地 127.0.0.1 ip 地址上设置了一个端口,以允许我连接到我自己的计算机,当我收到来自我的计算机的响应时,它说“400 Bad Request. The request is badly formed.”。我认为这与我通过 send(); 函数发送的 http header 信息有关。 sendbuf 包含要发送的 header 信息。这是我的代码:

#include <windows.h>
#include <winsock2.h>
#include <conio.h>
#include <stdio.h>
#include <iostream>
using namespace std;
#define SCK_VERSION2 0x0202
#define DEFAULT_BUFLEN 2000
#define DEFAULT_PORT 27015

namespace Globals{
    extern string input = "";
}
using namespace Globals;

void USERNAME() {
    do {
            printf("USERNAME: \t");
            getline(cin, input);
            if ( input == "User Name" ) {
                    break;
             }
        } while(true);

}

void PASSWORD() {
    do {
        printf("PASSWORD: \t");
    getline(cin, input);
    if ( input == "Password" ) {
        break;
    }
    USERNAME();
    } while(true);
}

int whole() {

    USERNAME();
    PASSWORD();

    //----------------------
    // Declare and initialize variables.
    WSADATA wsaData;
    int iResult;

    SOCKET ConnectSocket = INVALID_SOCKET;
    struct sockaddr_in clientService;

    char name[500] = "";
    char ipADDRESS[500] = "";
    char sPORT[500] = "";

    sockaddr_in sName;
    int sNameSize =  sizeof(sName);

    char *sendbuf = "GET /TR HTTP/1.1 \nHost: net.tutsplus.com \nUser-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 (.NET CLR 3.5.30729) \nAccept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 \nAccept-Language: en-us,en;q=0.5 \nAccept-Encoding: gzip,deflate \nAccept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 \nKeep-Alive: 300 \nConnection: keep-alive \nCookie: PHPSESSID=r2t5uvjq435r4q7ib3vtdjq120 \nPragma: no-cache \nCache-Control: no-cache";
    char recvbuf[DEFAULT_BUFLEN];
    int recvbuflen = DEFAULT_BUFLEN;                                    //208.109.181.178
    int WSAERROR = WSAGetLastError();
    //system("color 04");
    //----------------------
    // Initialize Winsock
    iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
    if (iResult != NO_ERROR) {
      printf("WSAStartup failed: %d\n", iResult);
      return 1;
    }

    //----------------------
    // Create a SOCKET for connecting to server
    ConnectSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (ConnectSocket == INVALID_SOCKET) {
        printf("Error at socket(): %i\n", WSAGetLastError() );
        WSACleanup();
        return 1;
    }

    //----------------------
    // The sockaddr_in structure specifies the address family,
    // IP address, and port of the server to be connected to.

    printf("IP ADDRESS: \n");
    cin >> ipADDRESS;
    printf("PORT: \n");
    cin >> sPORT;
    u_short PORT = strtoul(sPORT, NULL, 0);
    clientService.sin_family = AF_INET;
    clientService.sin_addr.s_addr = inet_addr(ipADDRESS);                            //74.125.196.191
    clientService.sin_port = htons(PORT);

    //----------------------
    // Connect to server.
    iResult = connect( ConnectSocket, (SOCKADDR*) &clientService, sizeof(clientService) );
    if ( iResult == SOCKET_ERROR) {
        closesocket (ConnectSocket);
        printf("Unable to connect to server: %i\n", WSAGetLastError());
        WSACleanup();
        return 1;
    }

    //----------------------
    //Get local host name
    iResult = gethostname(name, sizeof(name));
    if (iResult == NO_ERROR) {
        printf("Host Name: %s\n", name);
    }
    else if (iResult == SOCKET_ERROR) {
        printf("Could not resolve host name: %i", WSAGetLastError());
    }

    //------------------------
    //Get peer name
    iResult = getpeername(ConnectSocket, (struct sockaddr*)&sName, &sNameSize);
    if (iResult == NO_ERROR)
        printf("Peer Name: %s\n", inet_ntoa(sName.sin_addr));
    else if (iResult == SOCKET_ERROR)
        printf("Could not get peer name: %i\n", WSAGetLastError());

    //-------------------------
    // Send an initial buffer
    iResult = send( ConnectSocket, sendbuf, (int)strlen(sendbuf), 0 );
    if (iResult == SOCKET_ERROR) {
        printf("send failed: %d\n", WSAGetLastError());
        closesocket(ConnectSocket);
        WSACleanup();
        return 1;
    }
    else
        printf("Bytes Sent: %i\n", iResult);

    //-----------------------------
    // shutdown the connection since no more data will be sent
    iResult = shutdown(ConnectSocket, SD_SEND);
    if (iResult == SOCKET_ERROR) {
        printf("shutdown failed: %d\n", WSAGetLastError());
        closesocket(ConnectSocket);
        WSACleanup();
        return 1;
    }

    // Receive until the peer closes the connection
    do {

        iResult = recv(ConnectSocket, recvbuf, recvbuflen, 0);
        if ( iResult > 0 ) {
            printf("Bytes received: %d\n", iResult); //printf("Bytes received: %d\n", iResult);
            printf("From server: %s\n", recvbuf);
        }
        else if ( iResult == 0 )
            printf("Connection closed\n");
        else if (WSAERROR == WSAETIMEDOUT)
            printf("recv failed: WSAETIMEDOUT\n");
        printf("Do you want to disconnect? (Y/N) \n");
        cin >> input;
        if ( input == "Y"||"y" ) {
            break;
        }
        else if ( input == "N"||"n" ) {
            break;
        }
    } while( iResult > 0 );

    // cleanup
    closesocket(ConnectSocket);
    WSACleanup();
    system("PAUSE");
    return 0;
}

int main() {
    do {
        whole();
    } while( input != "N"||"n" );

}

我想通了,在 sendbuf 我输入了一个无效的主机名。 XD