`object
method content_disposition :
unit -> string * (string * Mimestring.s_param) list
method content_length : unit -> int
method content_transfer_encoding : unit -> string
method content_type : unit -> string * (string * Mimestring.s_param) list
method delete_field : string -> unit
method field : string -> string
method fields : (string * string) list
method multiple_field : string -> string list
method ro : bool
method set_fields : (string * string) list -> unit
method update_field : string -> string -> unit
method update_multiple_field : string -> string list -> unit
end`