unbreak http request

Summary:
there was a missing space before the HTTP version qualifier, missing a
space there makes the request random garbage as far as the spec (and
in fact most server impls) are concerned and result in broken webseeds
as servers may respond with literally anything seeing as we've made
a request with random garbage

CCBUG: 382375

Test Plan: server starts responding to requests according to wireshark captures

Reviewers: stikonas

Reviewed By: stikonas

Differential Revision: https://phabricator.kde.org/D23110