bpo-33365: print the header values beside the keys (GH-6611)


with debuglevel=1 only the header keys got printed. With
this change the header values get printed as well and the single
header entries get '\n' as a separator.
(cherry picked from commit 936f03e7fafc28fd6fdfba11d162c776b89c0167)

Co-authored-by: Marco Strigl <mstrigl@suse.com>
3 files changed