code: function verifyRedirectURI (req, res, next) {
    var params = req.connectParams
  
    Client.get(params.client_id, {
      private: true
    }, function (err, client) {
      if (err) { return next(err) }
  
      // The client must be registered.
      if (!client || client.redirect_uris.indexOf(params.redirect_uri) === -1) {
        delete req.connectParams.client_id
        delete req.connectParams.redirect_uri
        delete req.connectParams.response_type
        delete req.connectParams.scope
        return next()
      }
  
      // Make client available to downstream middleware.
      req.client = client
  
      next()
    })
  }
docs: Verify Redirect URI
  
  This route-specific middleware retrieves a registered client and adds it
  to the request object for use downstream. It verifies that the client is
  registered and that the redirect_uri parameter matches the configuration
  of the registered client.
  
  However, unlike the verifyClient middleware, this middleware will not
  cause any errors, but instead remove the invalid values off of the
  req.connectParams object.