BUG/MINOR: httpclient: remove the UNUSED block when parsing headers

Remove the UNUSED blocks when iterating on headers, we should not stop
when encountering one. We should only stop iterating once we found the
EOH block. It doesn't provoke a problem, since we don't manipulates
the headers before treating them, but it could evolve in the future.

Must be backported to 2.5.
1 file changed