code: public Response handle(MultivaluedMap<String, String> parameters) throws WebApplicationException
      {
          try
          {
              // Process the given parameters.
              return process(parameters);
          }
          catch (WebApplicationException e)
          {
              throw e;
          }
          catch (Throwable t)
          {
              // Unexpected error.
              throw unexpected("Unexpected error in AuthorizationRequestHandler", t);
          }
      }
docs: Handle an authorization request to a <a href=
  "https://tools.ietf.org/html/rfc6749#section-3.1">authorization endpoint</a>
  of OAuth 2.0 (<a href="https://tools.ietf.org/html/rfc6749">RFC 6749</a>).
  
  @param parameters
  Request parameters of an authorization request.
  
  @return
  A response that should be returned from the endpoint to the
  client application.
  
  @throws WebApplicationException
  An error occurred.