Javascript 反应+；express proxy不工作（不使用setupProxy.js）

代理服务器不工作。我没有使用http代理中间件

错误：

邮政404（未找到）

router.js

const express = require('express');
const router = express.Router();

router.get('/db', (req, res) => {console.log("/db");});
});

module.exports = router;

const app = express();
const PORT = process.env.PORT || 4000;
const { createProxyMiddleware } = require("http-proxy-middleware");

app.use(express.static(path.join(__dirname, './../../public')));
app.use("/", router)
app.use(createProxyMiddleware("/db", { target: 'http://localhost:4000', changeOrigin: true }));

app.listen(PORT, () => {
    console.log(`Check out the app at http://localhost:${PORT}`);
});

server.js

const express = require('express');
const router = express.Router();

router.get('/db', (req, res) => {console.log("/db");});
});

module.exports = router;

const app = express();
const PORT = process.env.PORT || 4000;
const { createProxyMiddleware } = require("http-proxy-middleware");

app.use(express.static(path.join(__dirname, './../../public')));
app.use("/", router)
app.use(createProxyMiddleware("/db", { target: 'http://localhost:4000', changeOrigin: true }));

app.listen(PORT, () => {
    console.log(`Check out the app at http://localhost:${PORT}`);
});

---

您的目标url应该是您的api_主机，而不是目标：'？