Index: /trunk/src/org/openstreetmap/josm/tools/HttpClient.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/tools/HttpClient.java	(revision 12920)
+++ /trunk/src/org/openstreetmap/josm/tools/HttpClient.java	(revision 12921)
@@ -141,5 +141,5 @@
                     DefaultAuthenticator.getInstance().addFailedCredentialHost(url.getHost());
                 }
-            } catch (IOException e) {
+            } catch (IOException | IllegalArgumentException e) {
                 Logging.info("{0} {1} -> !!!", requestMethod, url);
                 Logging.warn(e);