object
method amqp_body : Xdr_mstring.mstring list
method amqp_header : Netamqp_endpoint.props_t
method app_id : string option
method content_encoding : string option
method content_type : string option
method correlation_id : string option
method delivery_mode : int option
method expiration : string option
method headers : Netamqp_rtypes.table option
method message_id : string option
method priority : int option
method reply_to : string option
method timestamp : float option
method typ : string option
method user_id : string option
end