How to do Proxy Authentication

Question

Plz reply..

Thanks

How to make Proxy authentication in MFC. I use InternetSetOption method for it.But still i get ERROR_INTERNET_CONNOT_CONNECT.

in this i does not want to prompt the dialog box to take username and pwd , i do it hardcode,But i dosenot want to do this bcz every client have diff user name and pwd.What is possibility to tackle this.

Is any example for

Basic authentication scheme, where the user name and password are sent in cleartext to the server.

Challenge-response schemes, which allow for a challenge-response format.

Thanks..

I am use this code , Using this code GET method will work fine but POST didnot..

HINTERNET hOpenHandle,  hConnectHandle, hResourceHandle;
DWORD dwError, dwErrorCode;

hOpenHandle = InternetOpen("Example", 
                           INTERNET_OPEN_TYPE_PRECONFIG, 
                           NULL, NULL, 0);

hConnectHandle = InternetConnect(hOpenHandle,
                                 "www.server.com", 
                                 INTERNET_INVALID_PORT_NUMBER, ..why this Invalid port is used
                                 NULL,
                                 NULL, 
                                 INTERNET_SERVICE_HTTP,
                                 0,0);

hResourceHandle = HttpOpenRequest(hConnectHandle, "GET",
                                  "/premium/default.htm",
                                  NULL, NULL, NULL, 
                                  INTERNET_FLAG_KEEP_CONNECTION, 0);

resend:

HttpSendRequest(hResourceHandle, NULL, 0, NULL, 0);

// dwErrorCode stores the error code associated with the call to
// HttpSendRequest.  

dwErrorCode = hResourceHandle ? ERROR_SUCCESS : GetLastError();

dwError = InternetErrorDlg(hwnd, hResourceHandle, dwErrorCode, 
                           FLAGS_ERROR_UI_FILTER_FOR_ERRORS | 
                           FLAGS_ERROR_UI_FLAGS_CHANGE_OPTIONS |
                           FLAGS_ERROR_UI_FLAGS_GENERATE_DATA,
                           NULL);

if (dwError == ERROR_INTERNET_FORCE_RETRY)
    goto resend;

// Insert code to read the data from the hResourceHandle
// at this point.