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diff --git a/helm/ocaml/getter/http_getter_env.ml b/helm/ocaml/getter/http_getter_env.ml
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+(*
+ * Copyright (C) 2003-2004:
+ *    Stefano Zacchiroli <zack@cs.unibo.it>
+ *    for the HELM Team http://helm.cs.unibo.it/
+ *
+ *  This file is part of HELM, an Hypertextual, Electronic
+ *  Library of Mathematics, developed at the Computer Science
+ *  Department, University of Bologna, Italy.
+ *
+ *  HELM is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version 2
+ *  of the License, or (at your option) any later version.
+ *
+ *  HELM is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with HELM; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ *  MA  02111-1307, USA.
+ *
+ *  For details, see the HELM World-Wide-Web page,
+ *  http://helm.cs.unibo.it/
+ *)
+
+(* $Id$ *)
+
+open Printf
+
+open Http_getter_types
+open Http_getter_misc
+
+let version = Http_getter_const.version
+
+let prefix_RE = Pcre.regexp "^\\s*([^\\s]+)\\s+([^\\s]+)\\s*(.*)$"
+
+let cache_dir  = lazy (normalize_dir (Helm_registry.get "getter.cache_dir"))
+let dtd_dir = lazy (normalize_dir (Helm_registry.get "getter.dtd_dir"))
+let dtd_base_urls  = lazy (
+  let rex = Pcre.regexp "/*$" in
+  let raw_urls =
+    match
+      Helm_registry.get_list Helm_registry.string "getter.dtd_base_urls"
+    with
+    | [] -> ["http://helm.cs.unibo.it/dtd"; "http://mowgli.cs.unibo.it/dtd"]
+    | urls -> urls
+  in
+  List.map (Pcre.replace ~rex) raw_urls)
+let port            = lazy (
+  Helm_registry.get_opt_default Helm_registry.int ~default:58081 "getter.port")
+
+let parse_prefix_attrs s =
+  List.fold_right
+    (fun s acc ->
+      match s with
+      | "ro" -> `Read_only :: acc
+      | "legacy" -> `Legacy :: acc
+      | s ->
+          Http_getter_logger.log ("ignoring unknown attribute: " ^ s);
+          acc)
+    (Pcre.split s) []
+
+let prefixes = lazy (
+  let prefixes = Helm_registry.get_list Helm_registry.string "getter.prefix" in
+  List.fold_left
+    (fun acc prefix ->
+      let subs = Pcre.extract ~rex:prefix_RE prefix in
+      try
+        (subs.(1), (subs.(2), parse_prefix_attrs subs.(3))) :: acc
+      with Invalid_argument _ ->
+        Http_getter_logger.log ("skipping invalid prefix: " ^ prefix);
+        acc)
+    [] prefixes)
+
+let host = lazy (Http_getter_misc.backtick "hostname -f")
+
+let my_own_url =
+  lazy
+    (let (host, port) = (Lazy.force host, Lazy.force port) in
+    sprintf "http://%s%s" (* without trailing '/' *)
+    host (if port = 80 then "" else (sprintf ":%d" port)))
+
+let env_to_string () =
+  let pp_attr = function `Read_only -> "ro" | `Legacy -> "legacy" in
+  let pp_prefix (uri_prefix, (url_prefix, attrs)) =
+    sprintf "    %s -> %s [%s]" uri_prefix url_prefix
+      (String.concat "," (List.map pp_attr attrs)) in
+  let pp_prefixes prefixes =
+    match prefixes with
+    | [] -> ""
+    | l -> "\n" ^ String.concat "\n" (List.map pp_prefix l)
+  in
+  sprintf
+"HTTP Getter %s
+
+prefixes:%s
+dtd_dir:\t%s
+host:\t\t%s
+port:\t\t%d
+my_own_url:\t%s
+dtd_base_urls:\t%s
+log_file:\t%s
+log_level:\t%d
+"
+    version
+    (pp_prefixes (Lazy.force prefixes))
+    (Lazy.force dtd_dir) (Lazy.force host) (Lazy.force port)
+    (Lazy.force my_own_url) (String.concat " " (Lazy.force dtd_base_urls))
+    (match Http_getter_logger.get_log_file () with None -> "None" | Some f -> f)
+    (Http_getter_logger.get_log_level ())
+