TIME_WAIT issue

[TextTL]

I created proxy, I saw too many TIME_WAIT with netstat -nt. What could be the reason? Without going through the proxy, TIME_WAIT is very minimal. The TIME_WAIT is betwee proxy<->target. TIME_WAIT is normal on client <-> proxy.

I would think if the client has "connection: keep-alive", the proxy would honor the option, but it's not. I have to add the http.Agent. Also I thought that if the client wants "keep-alive", the proxy would forward the headers to the target, and also tried to keep the connection at its end; but it seems that the Http Proxy closes the connection to the target for every request?

the verison is:

"devDependencies": {
"http-proxy-middleware": "^2.0.6"
}

const app = express();
agent = new http.Agent({ maxSockets: Number.MAX_VALUE });
const webServProxy = createProxyMiddleware({
  agent: agent,
  target: 'http://127.0.0.1:8080', 
  changeOrigin: true, 
  headers: {
    connection: "keep-alive"
  },

  onError: (err, req, res, target) => {
    res.writeHead(500, {
      'Content-Type': 'text/plain',
    });
    res.end('Something went wrong.');
  }
});

app.use('/*', webServProxy);

Thanks,

[TextTL]

Updated

If I use

agent = new http.Agent({keepAlive: true });

agent = new http.Agent({keepAlive: true});
const webServProxy = createProxyMiddleware({
  agent: agent,
  target: 'http://127.0.0.1:8080', 
  changeOrigin: true, 

  onError: (err, req, res, target) => {
    res.writeHead(500, {
      'Content-Type': 'text/plain',
    });
    res.end('Something went wrong.');
  }
});

Then the problem is solved.