(** send a file through an out_channel, file can be passed as an in_channel
(if 'file' is given) or as a file name (if 'name' is given) *)
val send_file: ?name:string -> ?file:in_channel -> out_channel -> unit
(** send a file through an out_channel, file can be passed as an in_channel
(if 'file' is given) or as a file name (if 'name' is given) *)
val send_file: ?name:string -> ?file:in_channel -> out_channel -> unit