The object that handles the communication between two endpoints using the
Honk-RPC protocol. Provides methods for setting and getting configuration
parameters, reading and processing message documents, and handling API
requests and responses.
Computes the overhead of the Honk-RPC message type. This method in conjunction with
the other get_*_section_size(..) functions can be used to compute the size of a
Honk-RPC message with exactly one section.