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