out_channel ->
unit
+ (** respond with a 401 (Unauthorized) response asking for authentication
+ * against given realm (default is the server name) *)
+val respond_unauthorized:
+ ?version: Http_types.version -> ?realm:string -> out_channel -> unit
+
(** send an "error" response (i.e. 400 <= status < 600), optional body
argument as per send_redirect, default response status is 400 (bad request),
only error status are accepted by this function, other values will