diff -r 000000000000 -r 6474c204b198 mobile/android/base/fxa/login/BaseRequestDelegate.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mobile/android/base/fxa/login/BaseRequestDelegate.java	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,49 @@
+/* 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.fxa.login;
+
+import org.mozilla.gecko.background.fxa.FxAccountClient10;
+import org.mozilla.gecko.background.fxa.FxAccountClientException.FxAccountClientRemoteException;
+import org.mozilla.gecko.fxa.login.FxAccountLoginStateMachine.ExecuteDelegate;
+import org.mozilla.gecko.fxa.login.FxAccountLoginTransition.AccountNeedsVerification;
+import org.mozilla.gecko.fxa.login.FxAccountLoginTransition.LocalError;
+import org.mozilla.gecko.fxa.login.FxAccountLoginTransition.RemoteError;
+
+public abstract class BaseRequestDelegate<T> implements FxAccountClient10.RequestDelegate<T> {
+  protected final ExecuteDelegate delegate;
+  protected final State state;
+
+  public BaseRequestDelegate(State state, ExecuteDelegate delegate) {
+    this.delegate = delegate;
+    this.state = state;
+  }
+
+  @Override
+  public void handleFailure(FxAccountClientRemoteException e) {
+    // Order matters here: we don't want to ignore upgrade required responses
+    // even if the server tells us something else as well. We don't go directly
+    // to the Doghouse on upgrade required; we want the user to try to update
+    // their credentials, and then display UI telling them they need to upgrade.
+    // Then they go to the Doghouse.
+    if (e.isUpgradeRequired()) {
+      delegate.handleTransition(new RemoteError(e), new Separated(state.email, state.uid, state.verified));
+      return;
+    }
+    if (e.isInvalidAuthentication()) {
+      delegate.handleTransition(new RemoteError(e), new Separated(state.email, state.uid, state.verified));
+      return;
+    }
+    if (e.isUnverified()) {
+      delegate.handleTransition(new AccountNeedsVerification(), state);
+      return;
+    }
+    delegate.handleTransition(new RemoteError(e), state);
+  }
+
+  @Override
+  public void handleError(Exception e) {
+    delegate.handleTransition(new LocalError(e), state);
+  }
+}