Configure keepAliveTimeout/timeout on HTTP server (Node 8+) to prevent increased delay after idling

[aloker]

See https://nodejs.org/dist/latest-v8.x/docs/api/http.html#http_server_keepalivetimeout

As described in #1368, starting from Node v8, the server will disconnect the socket after 5 seconds of idling. Re-establishing the socket seems to take something in the order of tenths of seconds, making SPA prerendering requests with more than 5 seconds in between taking considerably longer than necessary (e.g. >1 second).

I suggest setting the keepAliveTimeout to a higher value, or to 0 or to make it configurable.

Update: also, the timeout property (https://nodejs.org/api/http.html#http_server_timeout) should be configurable. By default, the server-socket will timeout after 2 minutes, even if the keepAliveTimeout is set to 0.

[SteveSandersonMS]

Thanks for the info! Would you be willing to submit a PR that makes this configurable?

I'll close this pending any PR.