Node 代理访问的实现

 const Koa = require('koa') const bodyParser = require('koa-bodyparser') // 路由 const router = require('./router') const app = new Koa() app.use( bodyParser({ // 返回的对象是一个键值对，当extended为false的时候，键值对中的值就为'String'或'Array'形式，为true的时候，则可为任何数据类型。 extended: true }) ) 

 app.use(async (ctx, next) => { ctx.set('Access-Control-Allow-Origin', '*') ctx.set('Access-Control-Allow-Headers', 'content-type') ctx.set( 'Access-Control-Allow-Methods', 'OPTIONS,GET,HEAD,PUT,POST,DELETE,PATCH' ) await next() }) 

 // app.js app.use(router.routes()) // router.js const Router = require('koa-router') let koaRequest = require('./httpRequest') const router = new Router() router.get('/*', async (ctx, next) => { const url = setQuestUrl(ctx.url) try { let res = await koaRequest(url, 'GET', ctx) ctx.body = res } catch (err) { ctx.body = err } }) router.post('/*', async (ctx, next) => { const url = setQuestUrl(ctx.url) try { let res = await koaRequest(url, 'POST', ctx) ctx.body = res } catch (err) { ctx.body = err } }) function setQuestUrl(url) { if (/^\/t/.test(url)) { return 'host1'+ url.replace(/^\/t/, '') } if (/^\/xt/.test(url)) { return 'host2' + url.replace(/^\/xt/, '') } } module.exports = router 

 const Koa = require('koa2'); const app = new Koa(); // logger app.use(async (ctx, next) => { console.log('第一层洋葱 - 开始') await next(); const rt = ctx.response.get('X-Response-Time'); console.log(`${ctx.method} ${ctx.url} - ${rt}`); console.log('第一层洋葱 - 结束') }); // x-response-time app.use(async (ctx, next) => { console.log('第二层洋葱 - 开始') const start = Date.now(); await next(); const ms = Date.now() - start; ctx.set('X-Response-Time', `${ms}ms`); console.log('第二层洋葱 - 结束') }); // response app.use(async ctx => { console.log('第三层洋葱 - 开始') ctx.body = 'Hello World'; console.log('第三层洋葱 - 结束') }); app.listen(8000); // 输出 第一层洋葱 - 开始 第二层洋葱 - 开始 第三层洋葱 - 开始 第三层洋葱 - 结束 第二层洋葱 - 结束 第一层洋葱 - 结束

 let koa2Req = require('koa2-request') let constConfig = require('./const') let iToken = constConfig.iToken let koaRequest = async function(url, method, ctx) { let options = { method: method, uri: url, timeout: 120000, body: ctx ? { ...ctx.request.body } : null, headers: {}, json: true // Automatically stringifies the body to JSON } options.headers['Cookie'] = `i-token=${iToken}` //设置cookie let res = await koa2Req(options) return res.body } // node-mon async function getTestToken() { if (!constConfig.iToken) { let url = `http://xt.eqxiu.com/tui/app/radar/test/getToken?companyId=${constConfig.companyId}&staffId=${constConfig.staffId}` try { let res = await koaRequest(url, 'GET') iToken = res.obj console.log('token已拿到：' + iToken) } catch (e) { console.log(e) } } } getTestToken() module.exports = koaRequest 

 const app = require('./app') //const createWebsocket = require('./websocket') const server = require('http').createServer(app.callback()) server.setTimeout(2 * 60 * 1000) //设置超时时间 const { PORT = 3000 } = process.env server.listen(PORT, () => { console.log(`Listening on port ${PORT}`) }) 

 yarn add nodemon

 { "ignore": ["node_modules/*"] //忽略node_modules下文件修改的监听 } 

 { "dependencies": { "koa": "^2.8.1", "koa-bodyparser": "^4.2.1", "koa-router": "^7.4.0", "koa2-request": "^1.0.4", "nodemon": "^1.19.1" }, "scripts": { "server": "nodemon index.js" } }