code: def form_echo(cls, request,
                    foo: (Ptypes.form, String('A form parameter'))) -> [
              (200, 'Ok', String)]:
          '''Echo the form parameter.'''
          log.info('Echoing form param, value is: {}'.format(foo))
          for i in range(randint(0, MAX_LOOP_DURATION)):
              yield
          msg = 'The value sent was: {}'.format(foo)
          Respond(200, msgf form_echo(cls, request,
                    foo: (Ptypes.form, String('A form parameter'))) -> [
              (200, 'Ok', String)]:
          '''Echo the form parameter.'''
          log.info('Echoing form param, value is: {}'.format(foo))
          for i in range(randint(0, MAX_LOOP_DURATION)):
              yield
          msg = 'The value sent was: {}'.format(foo)
          Respond(200, msg)
docs: Echo the form parameter.