backend probe: no need to parse a reason phrase we do not use
backend probe: no need to parse a reason phrase we do not use

Ref: bcdf4f12891eb7ecba395bdf268f8be4c9faa255

https://tools.ietf.org/html/rfc7230#section-3.1.2

feld/Varnish-Cache,feld/Varnish-Cache,gquintard/Varnish-Cache,feld/Varnish-Cache,feld/Varnish-Cache,gquintard/Varnish-Cache,gquintard/Varnish-Cache,feld/Varnish-Cache,gquintard/Varnish-Cache