Proxy created with websocket stops working after a few minutes

[hayzamjs]

Checks

• I understand project setup issues should be asked on StackOverflow or in GitHub Discussions.
• I updated to latest http-proxy-middleware.

Describe the bug (be clear and concise)

I have an instance of ttyd that is already reverse proxied by nginx at the URL https://192.168.1.1:4443/ttyd and that is available and functional when I visit it. My end goal is to have this instance in an iframe in one of my web applications that uses node.js and express as the web framework.

This is how I create the proxy:

const ttydProxy = createProxyMiddleware({
  target: `https://192.168.1.1:4443/ttyd`,
  changeOrigin: true,
  ws: true,
  secure: false,
  logLevel: 'silent',
  pathRewrite: {
    '^/ttyd': ''
  },
  onProxyReq: fixRequestBody
})

And I use it with the express app like this:

app.use(['/ttyd', '/ttyd/*'], [ensureAuthenticated, ttydProxy])

Everything works well, atleast for a few minutes i.e before my browser starts showing this in the console with the iframe in question:

I'm not sure if it's something to do with my setup or something else entirely, would love some pointers in the right direction if it is indeed my fault

Step-by-step reproduction instructions

Try with the config I've mentioned in the description that should be able to reproduce the issue

Expected behavior (be clear and concise)

Websocket should be able to connect even after a long period of inactivity

How is http-proxy-middleware used in your project?

app@0.0.1 /www/app
`-- http-proxy-middleware@2.0.6

What http-proxy-middleware configuration are you using?

const ttydProxy = createProxyMiddleware({
  target: `https://192.168.1.1:4443/ttyd`,
  changeOrigin: true,
  ws: true,
  secure: false,
  logLevel: 'silent',
  pathRewrite: {
    '^/ttyd': ''
  },
  onProxyReq: fixRequestBody
})

What OS/version and node/version are you seeing the problem?

OpenWRT Linux 22.04, NodeJS v16.17.1

Additional context (optional)

No response

[chimurai]

If you think it's an bug; Can you provide a minimal working reproduction?

[hayzamjs]

https://codesandbox.io/s/http-proxy-middleware-forked-w6fvni?file=/src/index.js

I've made a sandbox here but I'm not sure when the actual disconnection occurs or if the sandbox will be able to catch it because it looks like the sandbox "server" reboots every now and then?

So the issue is that when my express app starts up it is able to connect and I'm able to use ttyd well through the reverse proxy but after a while, the wss part just throws a 404 even though it was working for a while

[hayzamjs]

This is my setup now, I simplified it to just one route which is /ttyd

const ttydProxy = createProxyMiddleware({
  target: `https://${getLocalIP()}:4443/ttyd`,
  changeOrigin: true,
  ws: true,
  secure: false,
  logLevel: 'debug',
  pathRewrite: {
    '^/ttyd': ''
  },
  onProxyReq: function(proxyReq, req, res) {
    //console.log('path', req.path)
    console.log('url', req.url)
  }
})

app.use('/ttyd', [ensureAuthenticated, ttydProxy])

Then I initialize the express app using

spdy.createServer(sslOptions, app).listen(PORT, () => {
  logger.info(`app server listening on port ${PORT}`)
});

I have a bunch of other stuff in app, I've set this up to run now, I'm gonna see if this also fails after sometime and try to get more logs out of it

EDIT: it did stop working again and I see these in my syslogs:

Sun Feb 26 23:05:26 2023 daemon.notice ttyd[9111]: [2023/02/26 23:05:26:2096] N: __lws_lc_untag:  -- [wsisrv|3a8|adopted] (0) 626μs
Sun Feb 26 23:05:26 2023 daemon.err nginx[12682]: 2023/02/26 23:05:26 [error] 12693#0: *31 upstream prematurely closed connection while reading response header from upstream, client: 192.168.1.1, server: _lan, request: "GET /ttyd/ttyd/ws HTTP/1.1", upstream: "http://192.168.1.1:7681//ttyd/ws", host: "192.168.1.1:4443"
Sun Feb 26 23:05:26 2023 daemon.notice ttyd[9111]: [2023/02/26 23:05:26:3549] N: __lws_lc_tag:  ++ [wsisrv|3a9|adopted] (1)
Sun Feb 26 23:05:26 2023 daemon.notice ttyd[9111]: [2023/02/26 23:05:26:3551] N: HTTP /token - 192.168.1.1
Sun Feb 26 23:05:26 2023 daemon.notice ttyd[9111]: [2023/02/26 23:05:26:3556] N: __lws_lc_untag:  -- [wsisrv|3a9|adopted] (0) 679μs

[hayzamjs]

I fixed it by removing ws:true from the other reverse proxies I was having, now only the ttyd proxy has ws:true if anyone else comes across this issue in the future, I'm not really sure why this happens, but it works for me now