[datafeed] io.BytesIO requires a buffer, not a unicode (closes #9783743)
The URLLibResponseAdapter should probably be refactored (or killed?)
option_group_changed('port', 'main', 'web')
option_group_changed('query-log-file', 'main', 'web')
option_group_changed('profile', 'main', 'web')
option_group_changed('max-post-length', 'main', 'web')