Winsock 程序收到 400 错误请求，您的浏览器发送了该服务器无法理解的请求

Question

我使用 winsock2 用 C++ 编写了一个程序并连接到 GoDaddy。但是我明白了

HTTP/1.1 400 Bad Request
Date: Mon, 17 Aug 2015 01:53:38 GMT
Server: Apache
Content-Length: 300
Connection: close
Content-Type: text/html; charset=iso-8859-1

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>400 Bad Request</title>
</head><body>
<h1>Bad Request</h1>
<p>Your browser sent a request that this server could not understand.<br />
</p>
<hr>
<address>Apache Server at default.secureserver.net Port 80</address>
</body></html>

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;

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 /offers/online-business.aspx HTTP/1.1 \nHost: I took this out, not giving myself away \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: \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" );

}

sendbuf 包含 GET 请求。我在网上找到的示例基本上显示它是在寻找特定目录。它会更像是您要求一个目录和一个特定的 html 文件还是什么？如果有人能告诉我参数或如何正确发出 GET 请求，将不胜感激。

编辑：有谁知道这是否与 \r\n 有关？

Answer 1

需要注意的一件事是 HTTP headers，它的格式似乎不正确。

Each line must be terminated with \r\n, and the entire header block with \r\n\r\n.

此外，Cookie header 没有任何价值 - 不确定这是否会导致问题。

尝试这样的事情（在每个 header、\r\n\r\n 之后添加 \r 以终止块，删除 Cookie:

char *sendbuf = "GET /offers/online-business.aspx HTTP/1.1\r\n"
    "Host: I took this out, not giving myself away\r\n"
    "User-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)\r\n"
    "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n"
    "Accept-Language: en-us,en;q=0.5\r\n"
    "Accept-Encoding: gzip,deflate\r\n"
    "Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\n"
    "Keep-Alive: 300\r\n"
    "Connection: keep-alive\r\n"
    "Pragma: no-cache\r\n"
    "Cache-Control: no-cache\r\n\r\n";

Winsock 程序收到 400 错误请求，您的浏览器发送了该服务器无法理解的请求

Winsock program getting 400 bad request, your browser sent a request this server couldn't understand

c++

sockets

http

get

winsock2