Index: /trunk/src/org/openstreetmap/josm/tools/Http1Client.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/tools/Http1Client.java	(revision 15797)
+++ /trunk/src/org/openstreetmap/josm/tools/Http1Client.java	(revision 15798)
@@ -83,5 +83,9 @@
             @Override
             public String getResponseVersion() {
-                return "HTTP_1";
+                String headerField = connection.getHeaderField(0);
+                if (headerField != null && headerField.startsWith("HTTP")) {
+                    return headerField.replaceFirst(" .*", "");
+                }
+                return "HTTP/1";
             }