code: public Response handle(
              MultivaluedMap<String, String> parameters, String authorization) throws WebApplicationException
      {
          return handle(parameters, authorization, null);
      }
docs: Handle a token request.
  
  This method is an alias of the {@link #handle(MultivaluedMap, String,
  String[]) handle()} method which accepts 3 arguments.
  
  @param parameters
  Request parameters of a token request.
  
  @param authorization
  The value of {@code Authorization} header in the token request.
  A client application may embed its pair of client ID and client
  secret in a token request using <a href=
  "https://tools.ietf.org/html/rfc2617#section-2">Basic
  Authentication</a>.
  
  @return
  A response that should be returned from the endpoint to the
  client application.
  
  @throws WebApplicationException
  An error occurred.