fix(server): cache-control header missing from / requests

[michelheusschen]

Just ran into the same issue @alextran1502 had a couple of days ago where requests are being made to the old user endpoint. Turns out requests to / are missing the cache-control header, because sirv runs first and will serve index.html that browsers can cache.

Fixed by disabling extension fallback (defaults to ['html', 'htm'])

[jrasm91]

I am pretty sure this won't work. The static file serving needs to run first so we know if we need to fall back to the index.html page or not.

[jrasm91]

This now basically returns the index.html page for every web request.

[michelheusschen]

Updated to disable extension fallback (defaults to ['html', 'htm'])