c++ - Code to send an HTTP request through a proxy using WinHttp -

i using winhttp.lib library send http request in c++ remote server.

on client side, http request has sent proxy ip w.x.y.z , port 1234.

according prototype of function winhttpopen() (https://msdn.microsoft.com/en-us/library/windows/desktop/aa384098%28v=vs.85%29.aspx), in particular parameters dwaccesstype, pwszproxyname , pwszproxybypass, looks function has told proxy.

how tell winhttpopen() function proxy send http request (ip = w.x.y.z, port = 1234)?

the structure winhttp_proxy_info (https://msdn.microsoft.com/en-us/library/windows/desktop/aa383912%28v=vs.85%29.aspx) looks interesting know how use in combination winhttpopen().

thank you.

have tried winhttpsetoption winhttp_option_proxy flag? 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 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));          [ ... ]     } 

the above set session use 2 proxies... 127.0.0.1:1234, , blarg.com:4545. can change scheme using https if need. set parameters proxy username , password using winhttp_option_proxy_username, , winhttp_option_proxy_password options.

please note i've performed little no error checking. want ensure options set properly, etc.