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diff --git a/netwerk/base/nsIUploadChannel.idl b/netwerk/base/nsIUploadChannel.idl
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+++ b/netwerk/base/nsIUploadChannel.idl
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 nsIInputStream;
+
+/**
+ * nsIUploadChannel
+ *
+ * A channel may optionally implement this interface if it supports the
+ * notion of uploading a data stream.  The upload stream may only be set
+ * prior to the invocation of asyncOpen on the channel.
+ */
+[scriptable, uuid(5cfe15bd-5adb-4a7f-9e55-4f5a67d15794)]
+interface nsIUploadChannel : nsISupports
+{
+    /**
+     * Sets a stream to be uploaded by this channel.
+     *
+     * Most implementations of this interface require that the stream:
+     *   (1) implement threadsafe addRef and release
+     *   (2) implement nsIInputStream::readSegments
+     *   (3) implement nsISeekableStream::seek
+     *
+     * History here is that we need to support both streams that already have
+     * headers (e.g., Content-Type and Content-Length) information prepended to
+     * the stream (by plugins) as well as clients (composer, uploading
+     * application) that want to upload data streams without any knowledge of
+     * protocol specifications.  For this reason, we have a special meaning
+     * for the aContentType parameter (see below).
+     *
+     * @param aStream
+     *        The stream to be uploaded by this channel.
+     * @param aContentType
+     *        If aContentType is empty, the protocol will assume that no
+     *        content headers are to be added to the uploaded stream and that
+     *        any required headers are already encoded in the stream.  In the
+     *        case of HTTP, if this parameter is non-empty, then its value will
+     *        replace any existing Content-Type header on the HTTP request.
+     *        In the case of FTP and FILE, this parameter is ignored.
+     * @param aContentLength
+     *        A value of -1 indicates that the length of the stream should be
+     *        determined by calling the stream's |available| method.
+     */
+    void setUploadStream(in nsIInputStream aStream,
+                         in ACString aContentType,
+                         in long long aContentLength);
+
+    /**
+     * Get the stream (to be) uploaded by this channel.
+     */
+    readonly attribute nsIInputStream uploadStream;
+};