// First, use WinHttpQueryHeaders to obtain the size of the buffer.
DWORD dwSize = 0;
        WinHttpQueryHeaders( hRequest, WINHTTP_QUERY_RAW_HEADERS_CRLF,
                             WINHTTP_HEADER_NAME_BY_INDEX, NULL, 
                             &dwSize, WINHTTP_NO_HEADER_INDEX);

        // Allocate memory for the buffer.
        if( GetLastError( ) == ERROR_INSUFFICIENT_BUFFER )
        {
            lpOutBuffer = new WCHAR[dwSize/sizeof(WCHAR)];

            // Now, use WinHttpQueryHeaders to retrieve the header.
            bResults = WinHttpQueryHeaders( hRequest, 
                                       WINHTTP_QUERY_RAW_HEADERS_CRLF,
                                       WINHTTP_HEADER_NAME_BY_INDEX, 
                                       lpOutBuffer, &dwSize, 
                                       WINHTTP_NO_HEADER_INDEX);
        }