setupProxy不起作用-http-proxy-middleware

Question

我的react应用程序在localhost：3000上运行，而节点服务器在localhost：5000上运行。 当我尝试连接Express API时，路由将转到“ localhost：3000 / auth / google”，而不是localhost：5000 / auth / google

UserAction.js

export const updateLoginUser = (userData, scheme) => async dispatch => {
console.log(scheme);
if(scheme === 'google') {
    // TODO: fetch user from the DB
    const fetchedUser = await axios.post('/auth/google');
    dispatch({
        type: UPDATE_USER, 
        payload: fetchedUser.data
    })
} else {
    // TODO: fetch user from the DB
    const fetchedUser = await axios.post('/api/get_user/', {
        method: 'POST',
        headers: {
            'content-type': 'application/json'
        },
        body: JSON.stringify(userData)
    })
    dispatch({
        type: UPDATE_USER, 
        payload: fetchedUser.data
    })
}

}

setupProxy.js

 const proxy = require('http-proxy-middleware')
module.exports = function(app) {
    app.use(proxy('/auth/google', { target: 'http://localhost:5000' }))
}

NODE server.js

const express = require('express');
const mongoose = require('mongoose');
const keys = require('./config/keys');
const cookieSession = require('cookie-session');
const passport = require('passport');
const cors = require('cors');
const morgan = require('morgan');

require('./models/Users');
require('./services/passport'); // it is not returing anything hence no need of assigning

mongoose.connect(keys.mongoDBURI, { useNewUrlParser: true, useUnifiedTopology: true });

const app = express();
app.use(cors());

// Setup the cookie session
app.use(cookieSession({
    maxAge: 30 * 24 * 60 * 1000, // Time till the cookie will be alive
    keys: [keys.cookieKey]
}));


app.use(morgan('combined'));
// Make passport know to use the cookieSession
app.use(passport.initialize());
app.use(passport.session());

require('./routes/authRoutes')(app); // authRoute returing a function and we are immediatly invoking that function

const PORT = process.env.PORT || 5000;
app.listen(5000);

编辑：反应package.json

{
  "name": "blogpost-frontend",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "axios": "^0.19.0",
    "http-proxy-middleware": "^0.20.0",
    "node-sass": "^4.13.0",
    "react": "^16.12.0",
    "react-dom": "^16.12.0",
    "react-redux": "^7.1.3",
    "react-router-dom": "^5.1.2",
    "react-scripts": "3.2.0",
    "redux": "^4.0.4",
    "redux-thunk": "^2.3.0"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  },
  "proxy": "http://localhost:5000"
}

我是新手，因此我不知道代理的工作原理。

Answer 1

我认为您忘记添加app.listen(api, proxy())的第一部分，而您只有proxy方法，可能是因为您没有指定要通过代理的url /路径。

var express = require('express');
var proxy = require('http-proxy-middleware');

var app = express();

app.use(
  '/api', // you miss this part in your server code
  proxy({ target: 'http://www.example.org', changeOrigin: true })
);
app.listen(3000);

// http://localhost:3000/api/foo/bar -> http://www.example.org/api/foo/bar

Answer 2

您可能需要按如下方式重写setupProxy.js

const { createProxyMiddleware } = require('http-proxy-middleware');
module.exports = function(app) {
  app.use(
    '/api',
    createProxyMiddleware({
      target: 'http://localhost:5000',
      changeOrigin: true,
    })
  );
};

然后进行npm安装。

对于我来说，该问题已解决。 在这里您可以查看更多详细信息https://create-react-app.dev/docs/proxying-api-requests-in-development/ 还提到了它：注意：此文件仅支持Node的JavaScript语法。确保仅使用支持的语言功能（即不支持Flow，ES模块等）。