code: public static HttpTransport createHttpTransport(HttpTransportType type) throws IOException {
      return createHttpTransport(
          type, /* proxyAddress= */ null, /* proxyUsername= */ null, /* proxyPassword= */ null);
    }
docs: Create an {@link HttpTransport} based on an type class.
  
  @param type The type of HttpTransport to use.
  @return The resulting HttpTransport.
  @throws IllegalArgumentException If the proxy address is invalid.
  @throws IOException If there is an issue connecting to Google's Certification server.