使用 WinHttp 通过代理发送 HTTP 请求的代码 [英] Code to send an HTTP request through a proxy using WinHttp

问题描述

我正在使用 Winhttp.lib 库将 C++ 中的 HTTP 请求发送到远程服务器.

I am using the Winhttp.lib library to send an HTTP request in C++ to a remote server.

在客户端，HTTP 请求必须发送到 IP 为 W.X.Y.Z 且端口为 1234 的代理.

On the client side, the HTTP request has to be sent to a proxy which IP is W.X.Y.Z and which port is 1234.

根据函数原型 WinHttpOpen() (https://msdn.microsoft.com/en-us/library/windows/desktop/aa384098%28v=vs.85%29.aspx),特别是参数dwAccessType、pwszProxyName和pwszProxyBypass，看起来这是必须告知代理的函数.

According to the prototype of the function WinHttpOpen() (https://msdn.microsoft.com/en-us/library/windows/desktop/aa384098%28v=vs.85%29.aspx), in particular the parameters dwAccessType, pwszProxyName and pwszProxyBypass, it looks like this is the function which has to be told about the proxy.

如何告诉 WinHttpOpen() 函数发送 HTTP 请求的代理是 (IP = W.X.Y.Z, PORT = 1234)?

How do I tell the WinHttpOpen() function that the proxy to send the HTTP request to is (IP = W.X.Y.Z, PORT = 1234)?

结构 WINHTTP_PROXY_INFO (https://msdn.microsoft.com/en-us/library/windows/desktop/aa383912%28v=vs.85%29.aspx) 看起来很有趣，但我知道怎么做与 WinHttpOpen() 结合使用.

The structure WINHTTP_PROXY_INFO (https://msdn.microsoft.com/en-us/library/windows/desktop/aa383912%28v=vs.85%29.aspx) looks interesting but I do know how to use it in combination with WinHttpOpen().

谢谢.

推荐答案

您是否尝试过带有 WINHTTP_OPTION_PROXY 标志的 WinHttpSetOption?大致如下:

Have you tried WinHttpSetOption with the WINHTTP_OPTION_PROXY flag? It would look roughly like this:

    hSession = WinHttpOpen(L"WinHTTP Example/1.0",
        WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,
        WINHTTP_NO_PROXY_NAME,
        WINHTTP_NO_PROXY_BYPASS, 0);        
    WINHTTP_PROXY_INFO proxy = { 0 };
    proxy.dwAccessType = WINHTTP_ACCESS_TYPE_NAMED_PROXY;
    proxy.lpszProxy = L"http://127.0.0.1:1234;http://blarg.com:4545";
    if (!WinHttpSetOption(hSession, WINHTTP_OPTION_PROXY, &proxy, sizeof(proxy)))
    {
        wprintf(L"Unable to set proxy.\n");
    }
    else
    {
        HINTERNET hRequest = WinHttpOpenRequest(hConnect, L"GET", NULL, NULL,
            WINHTTP_NO_REFERER, WINHTTP_DEFAULT_ACCEPT_TYPES, WINHTTP_FLAG_SECURE);
        char* username = "username";
        WinHttpSetOption(hRequest, WINHTTP_OPTION_PROXY_USERNAME, username, strlen(username));
        WinHttpSetOption(hRequest, WINHTTP_OPTION_PROXY_PASSWORD, password, strlen(password));

        [ ... ]
    }

以上内容会将您的会话设置为使用两个代理... 127.0.0.1:1234 和 blarg.com:4545.如果需要，您还可以使用 https 更改方案.它将使用 WINHTTP_OPTION_PROXY_USERNAME 和 WINHTTP_OPTION_PROXY_PASSWORD 选项设置代理用户名和密码的参数.

The above would set your session to use two proxies... 127.0.0.1:1234, and blarg.com:4545. You can also change the scheme using https if you need. It would set parameters for the proxy username and password using the WINHTTP_OPTION_PROXY_USERNAME, and WINHTTP_OPTION_PROXY_PASSWORD options.

请注意，我几乎没有执行过错误检查.您通常希望确保正确设置选项等.

Please note I've performed little to no error checking. You would normally want to ensure the options were set properly, etc.

这篇关于使用 WinHttp 通过代理发送 HTTP 请求的代码的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！