Node Proxy to Node App

[chuntley]

I'm running PM2 with 3 cores on a Node Proxy, and 3 cores on a Node App. The proxy takes the incoming request and throws it at either the Node app or Apache, depending on the URL.

This works fine until we hit high traffic. On the server I get the following error:

[proxy-6 (err)] Trace: Error
[proxy-6 (err)]     at ProxyServer.<anonymous> (/var/www/node/proxy.js:44:10)
[proxy-6 (err)]     at ProxyServer.emit (/var/www/node/node_modules/http-proxy/node_modules/eventemitter3/index.js:98:27)
[proxy-6 (err)]     at ClientRequest.proxyError (/var/www/node/node_modules/http-proxy/lib/http-proxy/passes/web-incoming.js:140:16)
[proxy-6 (err)]     at ClientRequest.emit (events.js:117:20)
[proxy-6 (err)]     at Socket.socketCloseListener (http.js:1522:9)
[proxy-6 (err)]     at Socket.emit (events.js:95:17)
[proxy-6 (err)]     at TCP.close (net.js:465:12)
[proxy-6 (err)] Error processing: /apache-redirect.php
[proxy-6 (err)] { [Error: socket hang up] code: 'ECONNRESET' }

On my local machine running Apache Bench with thousands of concurrent requests I get:

Error processing: /node_url
{ [Error: connect ECONNREFUSED]
  code: 'ECONNREFUSED',
  errno: 'ECONNREFUSED',
  syscall: 'connect' }
Trace: Error
    at ProxyServer.<anonymous> (C:\Users\site\proxy.js:45:13)
    at ProxyServer.emit (C:\Users\site\node_modules\http-proxy\node_modules\eventemitter3\index.js:98:27)
    at ClientRequest.proxyError (C:\Users\site\node_modules\http-proxy\lib\http-proxy\passes\web-incoming.js:140:16)
    at ClientRequest.emit (events.js:117:20)
    at Socket.socketErrorListener (http.js:1547:9)
    at Socket.emit (events.js:95:17)
    at net.js:440:14
    at process._tickCallback (node.js:419:13)

Also when I run benchmarks against the Node app itself (skipping the proxy), I do not hit any errors.

Any ideas on what is causing this? 95%+ of the requests work fine.

[jondubois]

There are a few issues which address this. See my answer here: #527

[indexzero]

Closing as a duplicate of #527. Thanks @jondubois!