I am trying to debug a proxy in Express, using `http-proxy-middleware`, but no matter what I do I get absolutely zero response. The endpoint sends the response but it is never returned by the proxy and the `onProxyRes` event is never triggered. Also the endpoint can be accessed directly through `curl`, Insomnia, `fetch` API and `request-promise` and is in use as an API for our customers.

Even with a setup as simple as:

```
app.use('/api', proxy({
  target: 'https://my.secret.endpoint',
  changeOrigin: true
});

```

I get absolutely zero response, except for a `ECONNRESET` after timeout. Any suggestions?