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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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/. */
+
+#include "nsISupports.idl"
+
+interface nsIStreamListener;
+
+/**
+ * A channel implementing this interface allows one to intercept its data by
+ * inserting intermediate stream listeners.
+ */
+[scriptable, uuid(68167b0b-ef34-4d79-a09a-8045f7c5140e)]
+interface nsITraceableChannel : nsISupports
+{
+ /*
+ * Replace the channel's listener with a new one, and return the listener
+ * the channel used to have. The new listener intercepts OnStartRequest,
+ * OnDataAvailable and OnStopRequest calls and must pass them to
+ * the original listener after examination. If multiple callers replace
+ * the channel's listener, a chain of listeners is created.
+ * The caller of setNewListener has no way to control at which place
+ * in the chain its listener is placed.
+ *
+ * Note: The caller of setNewListener must not delay passing
+ * OnStartRequest to the original listener.
+ *
+ * Note2: A channel may restrict when the listener can be replaced.
+ * It is not recommended to allow listener replacement after OnStartRequest
+ * has been called.
+ */
+ nsIStreamListener setNewListener(in nsIStreamListener aListener);
+};