typo

Signed-off-by: Mattias Andrée <maandree@operamail.com>
typo

Signed-off-by: Mattias Andrée <maandree@operamail.com>
add verify_utf8

Signed-off-by: Mattias Andrée <maandree@operamail.com>
verify that headers in messages are encoded with proper utf-8

Signed-off-by: Mattias Andrée <maandree@operamail.com>