When using the exchange attributes from documentation, TransportProtocolAttribute and RequestProtocolAttribute return the same response with a minor difference(e.g. TransportProtocolAttribute - http/1.1 and RequestProtocolAttribute - HTTP/1.1).

My questions are:

• What is the difference between the two and what are their applications? Can they be different? In what situations?
• If so - would not make sense to document such difference into doc?
• Note that TransportProtocolAttribute isn't mentioned in the documentation. Should it be also documented with the difference from RequestProtocol attribute?