Integrated Windows Authentication Wininet

Question

Hi experts I need to send an http request from C++ application using wininet API. User is behind ISA proxy server that is configured to use Integrated Windows Authentication. When I get error 407 (proxy authentication required) I use InternetErrorDlg to ask the user for credentials. This is not an ideal solution as the IE is able to use current user's credentials transparently. Is there a way to do this?

Sample code for request

hRequest = HttpOpenRequest ( 
    hConnect, 
    "POST", 
    query.c_str(), 
    HTTP_VERSION, 
    NULL, 
    cAcceptTypes, 
    INTERNET_FLAG_RELOAD | INTERNET_FLAG_NO_CACHE_WRITE| INTERNET_FLAG_KEEP_CONNECTION,
    0);

bRet = HttpSendRequest(
                hRequest,
                NULL,
                0,
                (LPVOID)dataXml.c_str(),
                (DWORD)dataXml.length());

bRet = HttpQueryInfo(
                hRequest,
                HTTP_QUERY_FLAG_NUMBER | HTTP_QUERY_STATUS_CODE,
                &dwStatus,
                &dwSize,
                NULL);


if (dwStatus == HTTP_STATUS_PROXY_AUTH_REQ)
{

    ProxyAuthenticate( hRequest );  // Here I call InternetErrorDlg
            bRet = HttpSendRequest(
                hRequest,
                NULL,
                0,
                (LPVOID)dataXml.c_str(),
                (DWORD)dataXml.length());

}

Answer 1

Try to use INTERNET_OPEN_TYPE_PRECONFIG to initialize Wininet in your process:

InternetOpen(clientName, INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);