Next.js 配置接口跨域代理轉發

使用 create-next-app 建立的 Next.js 項目配置接口跨域代理轉發須要用到 custom server 功能。
先安裝好 express 和 http-proxy-middleware

yarn add express http-proxy-middleware

在項目根目錄下新建 server.js 文件，寫入如下代碼

// server.js
const express = require('express')
const next = require('next')
const proxyMiddleware = require('http-proxy-middleware')

const devProxy = {
    '/api': {
        target: 'http://localhost:8000', // 端口本身配置合適的
        pathRewrite: {
            '^/api': '/'
        },
        changeOrigin: true
    }
}

const port = parseInt(process.env.PORT, 10) || 3000
const dev = process.env.NODE_ENV !== 'production'
const app = next({
    dev
})
const handle = app.getRequestHandler()

app.prepare()
    .then(() => {
        const server = express()

        if (dev && devProxy) {
            Object.keys(devProxy).forEach(function(context) {
                server.use(proxyMiddleware(context, devProxy[context]))
            })
        }

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

        server.listen(port, err => {
            if (err) {
                throw err
            }
            console.log(`> Ready on http://localhost:${port}`)
        })
    })
    .catch(err => {
        console.log('An error occurred, unable to start the server')
        console.log(err)
    })

相應地修改 package.json

"scripts": {
        "dev": "node server.js",
        "build": "next build",
        "start": "NODE_ENV=production node server.js"
    },

以下，全部接口以 /api 開頭便可。

const { data } = await axios.post('/api/users/', options)