`object
method advance : int -> unit
method bidirectional_phase : bool
method body_size : int64
method close_connection : bool
method front_token : Nethttpd_kernel.front_token
method protocol : Nethttp.protocol
method send : Nethttpd_kernel.resp_token -> unit
method send_queue_empty : bool
method set_callback : (unit -> unit) -> unit
method set_state : Nethttpd_kernel.resp_state -> unit
method state : Nethttpd_kernel.resp_state
method transfer_encoding : Nethttpd_kernel.transfer_coding
end`