> If there is a body, the first two bytes of the body MUST be a 2-byte unsigned integer (in network byte order) representing a status code with value /code/ defined in Section 7.4.  Following the 2-byte integer, the body MAY contain UTF-8-encoded data with value /reason/, the interpretation of which is not defined by this specification.  This data is not necessarily human readable but may be useful for debugging or passing information relevant to the script that opened the connection.

...which I interpret as "don't bother putting anything in there and save 4 lines of code"