Minor Description
The spec specification allows for spaces to exists at either end of a message header key or value. We currently trim the header keys in order to be forgiving of clients that don't adhere to the this and send odd keys with space padding, we should now stop this and align more closely to spec compliant behavior. This means some clients could see some oddness if they don't also ensure that keys we are looking for like 'destination' etc are not correctly formated on send.