Node.js 如何发送对POST请求的响应？

我正在使用“请求”库将HTTP POST请求从server.js发送到authentication.js。然后我想从authentication.js向server.js发回一个响应，我该怎么做

server.js

socket.on('client:authentication', function(authObject){
      request.post(
      'http://localhost:8090/authenticate',
      { json: { username: authObject.username, password: authObject.password } },
      function (error, response, body) {
          if (!error && response.statusCode == 200) {
              console.log(body)
          }
        }
      );
    });

  app.post('/authenticate', function(req, res){
    User.findOne({
      username: req.body.username
    }, function(err, user){

      if(!user){
        console.log('Authentication failed. User not found');
      }
      else if(user){
        if(user.password != req.body.password){
          console.log('Authentication failed. Wrong password');
        }
        else{

          var token = jwt.sign(user, app.get('secretWord'), {
            expiresIn : 10800
          });
          //I NEED TO SEND BACK THE TOKEN FROM HERE
        }

      }
    })
  });

authentication.js

socket.on('client:authentication', function(authObject){
      request.post(
      'http://localhost:8090/authenticate',
      { json: { username: authObject.username, password: authObject.password } },
      function (error, response, body) {
          if (!error && response.statusCode == 200) {
              console.log(body)
          }
        }
      );
    });

  app.post('/authenticate', function(req, res){
    User.findOne({
      username: req.body.username
    }, function(err, user){

      if(!user){
        console.log('Authentication failed. User not found');
      }
      else if(user){
        if(user.password != req.body.password){
          console.log('Authentication failed. Wrong password');
        }
        else{

          var token = jwt.sign(user, app.get('secretWord'), {
            expiresIn : 10800
          });
          //I NEED TO SEND BACK THE TOKEN FROM HERE
        }

      }
    })
  });

试试这个：

res.send({ 
    token: token
});

---

您可能希望使用

res.json

它与send相同，但是如果您想发送回json，它会自动发送正确的头