* http://cs.unibo.it/helm/.
*)
-val send: string -> unit
+ (** try to guess if an HTTP resource exists using HEAD request
+ * @return true if HEAD response code = 200 *)
+val exists: string -> bool
val get: string -> string
val get_and_save: string -> string -> unit
val get_and_save_to_tmp: string -> string
+val send: string -> unit
+