Proxy backend

proxy-backend wrapps node-http-proxy while monitoring the backend status with status-monitor.

Features

• Status checks / health checks , full features at status-monitor .
• Proxy http/websockets , full features at node-http-proxy (http-proxy) .
• Proxy traffic based on backend status.

node-http-proxy is by far the best library to proxy http traffic. It was just missing some healthchecks(status-monitor) to the destination it's forwarding to.

Simple usage

The following example is an express website that proxy to a remote server only when it's valid

const {ProxyBackend} = require('proxy-backend');
const proxyBackend = new ProxyBackend({
    proxyOptions : {
        target : 'http://example.com'
    },
    monitorOptions : {
        requestOptions : {
            url : 'http://example.com'
        }
    },
    onWebUnavailable(req , res){
        res.status(503).send(`example.com is down =( `)
    }
});
proxyBackend.proxy.on('proxyRes' , (proxyRes, req, res)=>{
    delete proxyRes.headers['cache-control']
    delete proxyRes.headers['etag']
})
proxyBackend.start();
proxyBackend.statusMonitor.on('testResult',(testResult)=>{
    console.log(`Just finished a test it was ${testResult.status}`)
})
proxyBackend.statusMonitor.on('statusChange',(status)=>{
    console.log(`Ok now I'm sure that server is ${status}`)
})
 
 //express....
const express = require('express')
const app = express()

app.disable('etag')
app.get('/', (req, res) => {
    req.headers.host = 'example.com';
    proxyBackend.web(req , res);
})

app.listen(3000, () => console.log('Example app listening on port 3000!'))

License

MIT