C# UWP/WinRT Google Drive: Export File to Requested MIME Type (Export to PDF)

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Exports a Google Doc to the requested MIME type and returns the exported content. Please note that the exported content is limited to 10MB.
(Export only supports Google Docs) See https://developers.google.com/drive/v3/web/manage-downloads for a list of MIME types.

Documentation: https://developers.google.com/drive/v3/reference/files/export

Chilkat.Rest rest = new Chilkat.Rest();
bool success;

//   Provide a previously obtained OAuth2 access token.
Chilkat.OAuth2 oauth2 = new Chilkat.OAuth2();
oauth2.AccessToken = "OAUTH2_ACCESS_TOKEN";
rest.SetAuthOAuth2(oauth2);

success = await rest.ConnectAsync("www.googleapis.com",443,true,true);
if (success != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

rest.AddQueryParam("mimeType","application/pdf");

//  First send the HTTP request.
success = await rest.SendReqNoBodyAsync("GET","/drive/v3/files/1zvzpTHO1dM9vNKYxpmr4YrX7x_R6qiNGFb8WB8h9wuI/export");
if (success != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

//  Read the response header.  If the response status code is success, stream to the file.
//  Otherwise receive the error response text.
int statusCode = await rest.ReadResponseHeaderAsync();
if (statusCode < 0) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

if (statusCode != 200) {
    Debug.WriteLine("Received error response code: " + Convert.ToString(statusCode));
    //  Read the error response body.
    Chilkat.StringBuilder sbErrResponse = new Chilkat.StringBuilder();
    success = await rest.ReadRespSbAsync(sbErrResponse);
    if (success != true) {
        Debug.WriteLine(rest.LastErrorText);
        return;
    }

    Debug.WriteLine("Error response:" + sbErrResponse.GetAsString());
    return;
}

//  Stream the response body to the output file.
Chilkat.Stream respBodyStream = new Chilkat.Stream();
respBodyStream.SinkFile = "/someDirectoryPath/test.pdf";
success = await rest.ReadRespBodyStreamAsync(respBodyStream,true);
if (success != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

Debug.WriteLine("Example Completed.");