FIX: HttpSendRequstEx/HttpEndRequest Does Not Work with Proxy Authentication (249594)

MORE INFORMATION

The following code will handle proxy authentication (in Internet Explorer 5) in the case of a proxy that requires basic authentication:

if(!HttpSendRequestEx( hRequest, &BufferIn, NULL, 0, 0))
// code between here and HttpEndRequest omitted for brevity

if(!HttpEndRequest(hRequest, NULL, 0, 0))
{
  DWORD dwError = GetLastError();
  printf( "Error on HttpEndRequest %lu \n", dwError);
  return FALSE;
}

// Added to test proxyauth
DWORD dwSize, dwCode;
CHAR szData[51];
dwSize = sizeof (DWORD);  

if ( !HttpQueryInfo (hRequest, 
      HTTP_QUERY_STATUS_CODE | HTTP_QUERY_FLAG_NUMBER, 
      &dwCode, &dwSize, NULL))
{
  printf( "Error on HttpQueryInfo %lu \n", GetLastError());
  return FALSE;
}

if ( dwCode == HTTP_STATUS_DENIED || 
      dwCode == HTTP_STATUS_PROXY_AUTH_REQ)
{  
  // We have to read all outstanding data on the Internet handle
  // before we can resubmit request. Just discard the data.
  do
  {
    InternetReadFile (hRequest, (LPVOID)szData, 50, &dwSize);
  } 
  while (dwSize != 0);

  if ( InternetErrorDlg (GetDesktopWindow(), hRequest,
          ERROR_INTERNET_INCORRECT_PASSWORD,
          FLAGS_ERROR_UI_FILTER_FOR_ERRORS |
          FLAGS_ERROR_UI_FLAGS_GENERATE_DATA |
          FLAGS_ERROR_UI_FLAGS_CHANGE_OPTIONS,
          NULL) == ERROR_INTERNET_FORCE_RETRY)
goto again;
}
				

To see a sample implementation of this code, click the article number below to view the article in the Microsoft Knowledge Base.