exception Invalid_header of string
exception Invalid_header_name of string
exception Invalid_header_value of string
exception Invalid_HTTP_version of string
exception Invalid_HTTP_method of string
exception Invalid_code of int
exception Invalid_header of string
exception Invalid_header_name of string
exception Invalid_header_value of string
exception Invalid_HTTP_version of string
exception Invalid_HTTP_method of string
exception Invalid_code of int