422不返回发送消息(Node.js/Redux)

const express = require('express');
const app = express();

app.use(express.json());

app.post('/sendMessage', (req, res) => {
  const { message } = req.body;

  if (!message) {
    res.status(422).json({ error: 'Missing message parameter' });
  } else {
    // 处理发送消息的逻辑
    res.json({ success: true });
  }
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});

// 定义action类型
const SEND_MESSAGE_REQUEST = 'SEND_MESSAGE_REQUEST';
const SEND_MESSAGE_SUCCESS = 'SEND_MESSAGE_SUCCESS';
const SEND_MESSAGE_FAILURE = 'SEND_MESSAGE_FAILURE';

// 定义action创建函数
const sendMessageRequest = () => ({
  type: SEND_MESSAGE_REQUEST,
});

const sendMessageSuccess = () => ({
  type: SEND_MESSAGE_SUCCESS,
});

const sendMessageFailure = () => ({
  type: SEND_MESSAGE_FAILURE,
});

// 定义异步action创建函数
const sendMessage = (message) => {
  return (dispatch) => {
    dispatch(sendMessageRequest());

    if (!message) {
      dispatch(sendMessageFailure({ error: 'Missing message parameter' }));
    } else {
      // 处理发送消息的逻辑
      dispatch(sendMessageSuccess());
    }
  };
};