如何为 Next.js API 请求进行 HTTP 代理

如何解决如何为 Next.js API 请求进行 HTTP 代理

我在网上尝试了很多东西，但到目前为止没有任何效果。

首先尝试 (src/pages/api/proxy/[...slug].js)：

import { createProxyMiddleware } from 'http-proxy-middleware';

// Create proxy instance outside of request handler function to avoid unnecessary re-creation
const apiProxy = createProxyMiddleware({
    target: 'http://localhost:5000',changeOrigin: true,pathRewrite: { [`^/api/proxy`]: '' },secure: false,});

export default function (req,res) {
    apiProxy(req,res,(result) => {
        if (result instanceof Error) {
            throw result;
        }

        throw new Error(`Request '${req.url}' is not proxied! We should never reach here!`);
    });
};

给我这样的错误：

TypeError: Object(...) is not a function
    at Module../pages/api/[...slug].js (/home/user/app/client/.next/server/pages/api/[...slug].js:109:101)
    at __webpack_require__ (/home/user/app/client/.next/server/pages/api/[...slug].js:23:31)
    at /home/user/app/client/.next/server/pages/api/[...slug].js:91:18
    at Object.<anonymous> (/home/user/app/client/.next/server/pages/api/[...slug].js:94:10)
    at Module._compile (node:internal/modules/cjs/loader:1092:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1121:10)
    at Module.load (node:internal/modules/cjs/loader:972:32)
    at Function.Module._load (node:internal/modules/cjs/loader:813:14)
    at Module.require (node:internal/modules/cjs/loader:996:19)
    at require (node:internal/modules/cjs/helpers:92:18)
    at DevServer.handleApiRequest (/home/user/app/client/node_modules/next/dist/next-server/server/next-server.js:64:181)
    at runMicrotasks (<anonymous>)
    at processticksAndRejections (node:internal/process/task_queues:94:5)
    at async Object.fn (/home/user/app/client/node_modules/next/dist/next-server/server/next-server.js:56:492)
    at async Router.execute (/home/user/app/client/node_modules/next/dist/next-server/server/router.js:23:67)
    at async DevServer.run (/home/user/app/client/node_modules/next/dist/next-server/server/next-server.js:66:1042)

第二次尝试（next.config.js）：

module.exports = {
    async rewrites() {
      return [
        {
          source: '/api/:path*',destination: 'http://localhost:5000/:path*' // Proxy to Backend
        }
      ]
    }
  }

这东西根本行不通。

第三次尝试 (next-http-proxy-middleware)：

// pages/[...all].ts
...
export default (req: NextApiRequest,res: NextApiResponse) => (
  isDevelopment
    ? httpProxyMiddleware(req,{
      // You can use the `http-proxy` option
      target: 'https://www.example.com',// In addition,you can use the `pathRewrite` option provided by `next-http-proxy`
      pathRewrite: {
        '^/api/new': '/v2','^/api': '',},})
    : res.status(404).send(null)
);

这东西根本没有文档......不知道它是如何工作的。

第四次尝试：

const express = require('express')
const next = require('next')
const { createProxyMiddleware } = require("http-proxy-middleware")

const port = process.env.PORT || 3000
const dev = process.env.NODE_ENV !== 'production'
const app = next({ dev })
const handle = app.getRequestHandler()

const apiPaths = {
    '/api': {
        target: 'http://localhost:3080',pathRewrite: {
            '^/api': '/api'
        },changeOrigin: true
    }
}

const isDevelopment = process.env.NODE_ENV !== 'production'

app.prepare().then(() => {
  const server = express()
 
  if (isDevelopment) {
    server.use('/api',createProxyMiddleware(apiPaths['/api']));
  }

  server.all('*',(req,res) => {
    return handle(req,res)
  })

  server.listen(port,(err) => {
    if (err) throw err
    console.log(`> Ready on http://localhost:${port}`)
  })
}).catch(err => {
    console.log('Error:::::',err)
})

这会在下一个应用程序中运行 express。 我需要将下一个应用程序和服务器分开。这不是我想要的。

解决方法

使用 next-http-proxy-middleware，您可以轻松地在 nextjs 中代理 api。

首先查看nextjs中api的使用方法。 -https://nextjs.org/docs/api-routes/api-middlewares

1. 在项目根路径的 [...all].ts 路径中创建一个 {yourproject_root}/pages/api/ 文件。
2. 复制下面的代码并将其写入 [...all].ts 文件。

export default (req: NextApiRequest,res: NextApiResponse) => httpProxyMiddleware(req,res,{
     // You can use the `http-proxy` option
     target:'https://www.example.com',// In addition,you can use the `pathRewrite` option provided by `next-http-proxy`
     pathRewrite: {
     '^/api/google':'https://google.com','^/api/myhome':'https://github.com/stegano'
     },});

3. 运行 nextjs，打开浏览器，然后尝试连接到 localhost:3000/api/google 或 localhost:3000/api/myhome。