diff -r 000000000000 -r 6474c204b198 mobile/android/base/sync/Sync11Configuration.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mobile/android/base/sync/Sync11Configuration.java	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,84 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko.sync;
+
+import java.net.URI;
+
+import org.mozilla.gecko.background.common.log.Logger;
+import org.mozilla.gecko.sync.crypto.KeyBundle;
+import org.mozilla.gecko.sync.net.AuthHeaderProvider;
+
+import android.content.SharedPreferences;
+import android.content.SharedPreferences.Editor;
+
+/**
+ * Override SyncConfiguration to restore the old behavior of clusterURL --
+ * that is, a URL without the protocol version etc.
+ *
+ */
+public class Sync11Configuration extends SyncConfiguration {
+  private static final String LOG_TAG = "Sync11Configuration";
+  private static final String API_VERSION = "1.1";
+
+  public Sync11Configuration(String username,
+                             AuthHeaderProvider authHeaderProvider,
+                             SharedPreferences prefs) {
+    super(username, authHeaderProvider, prefs);
+  }
+
+  public Sync11Configuration(String username,
+                             AuthHeaderProvider authHeaderProvider,
+                             SharedPreferences prefs,
+                             KeyBundle keyBundle) {
+    super(username, authHeaderProvider, prefs, keyBundle);
+  }
+
+  @Override
+  public String getAPIVersion() {
+    return API_VERSION;
+  }
+
+  @Override
+  public String storageURL() {
+    return clusterURL + API_VERSION + "/" + username + "/storage";
+  }
+
+  @Override
+  protected String infoBaseURL() {
+    return clusterURL + API_VERSION + "/" + username + "/info/";
+  }
+
+  protected void setAndPersistClusterURL(URI u, SharedPreferences prefs) {
+    boolean shouldPersist = (prefs != null) && (clusterURL == null);
+
+    Logger.trace(LOG_TAG, "Setting cluster URL to " + u.toASCIIString() +
+                          (shouldPersist ? ". Persisting." : ". Not persisting."));
+    clusterURL = u;
+    if (shouldPersist) {
+      Editor edit = prefs.edit();
+      edit.putString(PREF_CLUSTER_URL, clusterURL.toASCIIString());
+      edit.commit();
+    }
+  }
+
+  protected void setClusterURL(URI u, SharedPreferences prefs) {
+    if (u == null) {
+      Logger.warn(LOG_TAG, "Refusing to set cluster URL to null.");
+      return;
+    }
+    URI uri = u.normalize();
+    if (uri.toASCIIString().endsWith("/")) {
+      setAndPersistClusterURL(u, prefs);
+      return;
+    }
+    setAndPersistClusterURL(uri.resolve("/"), prefs);
+    Logger.trace(LOG_TAG, "Set cluster URL to " + clusterURL.toASCIIString() + ", given input " + u.toASCIIString());
+  }
+
+  @Override
+  public void setClusterURL(URI u) {
+    setClusterURL(u, this.getPrefs());
+  }
+}
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