docs: def dispatch(self):
          """Dispatch http request to registerd commands.
          Example::
  
              slack = Slack(app)
              app.add_url_rule('/', view_func=slack.dispatch)
          """
          from flask import request
  
          method = request.method
  
          data = request.args
          if method == 'POST':
              data = request.form
  
          token = data.get('token')
          team_id = data.get('team_id')
          command = data.get('command') or data.get('trigger_word')
  
          if isinstance(command, string_types):
              command = command.strip().lstrip('/')
  
          try:
              self.validate(command, token, team_id, method)
          except SlackError as e:
              return self.response(e.msg)
  
          func, _, _, kwargs = self._commands[(team_id, command)]
          kwargs.update(data.to_dict())
  
          return func(**kwargs)