update: Send `Connection: keep-alive` for all HTTP GET requests.
update: Send `Connection: keep-alive` for all HTTP GET requests.

> [2018-02-23 4:54 PM] Nmlgc:
>
>	lang_en, keep-alive: 1,297.209 seconds
>	lang_en,    without: 1,380.809 seconds
>	lang_fi, keep-alive:    64.218 seconds
>	lang_fi,    without:    65.209 seconds
>
> Not as big as I thought, and that might even just be unlucky traffic
> spikes, but yeah, let's add it, it only raises questions if we
> continue to omit it.

thpatch/thcrap,thpatch/thcrap,thpatch/thcrap,thpatch/thcrap,thpatch/thcrap