class virtual generic_call :object..end
This class is an implementation of http_call. A subclass must
define the virtual methods that mostly define the general properties
of the HTTP method.
method private virtual fixup_request : unit -> unitThis method is called just before sending the request. It can
fix up things in the `Effective request header.
method private virtual def_request_method : stringThe following methods define the values for the corresponding
methods without the def_ prefix:
method private virtual def_empty_path_replacement : string
method private virtual def_is_idempotent : bool
method private virtual def_has_req_body : bool
method private virtual def_has_resp_body : bool