Does decorateRequest support promises? about express-http-proxy HOT 1 CLOSED

app.use('/api', function(req, res, next) {
    .getTokenAsync()
    .then(function(token){
      proxy(options.host, {
        forwardPath: function(req, res) {
          return require('url').parse(req.url).path;
        },
        decorateRequest: function(req) {
            req.headers['Authorization'] = 'Bearer ' + token;
          return req;
        }
      })(req, res, next);
    });
});