diff -r 000000000000 -r 6474c204b198 netwerk/base/public/nsIURIChecker.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/netwerk/base/public/nsIURIChecker.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,62 @@
+/* -*- Mode: C++; tab-width: 2; 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 "nsIRequest.idl"
+
+interface nsIURI;
+interface nsIChannel;
+interface nsIRequestObserver;
+
+/**
+ * nsIURIChecker
+ *
+ * The URI checker is a component that can be used to verify the existence
+ * of a resource at the location specified by a given URI.  It will use
+ * protocol specific methods to verify the URI (e.g., use of HEAD request
+ * for HTTP URIs).
+ */
+[scriptable, uuid(4660c1a1-be2d-4c78-9baf-c22984176c28)]
+interface nsIURIChecker : nsIRequest
+{
+    /**
+     * Initializes the URI checker.  After this method is called, it is valid
+     * to further configure the URI checker by calling its nsIRequest methods.
+     * This method creates the channel that will be used to verify the URI.
+     * In the case of the HTTP protocol, only a HEAD request will be issued.
+     *
+     * @param aURI
+     *        The URI to be checked.
+     */
+    void init(in nsIURI aURI);
+
+    /**
+     * Returns the base channel that will be used to verify the URI.
+     */
+    readonly attribute nsIChannel baseChannel;
+
+    /**
+     * Begin asynchronous checking URI for validity.  Notification will be
+     * asynchronous through the nsIRequestObserver callback interface.  When
+     * OnStartRequest is fired, the baseChannel attribute will have been
+     * updated to reflect the final channel used (corresponding to any redirects
+     * that may have been followed).
+     *
+     * Our interpretations of the nsIRequestObserver status codes:
+     *   NS_BINDING_SUCCEEDED:   link is valid
+     *   NS_BINDING_FAILED:      link is invalid (gave an error)
+     *   NS_BINDING_ABORTED:     timed out, or cancelled
+     *
+     * @param aObserver
+     *        The object to notify when the link is verified.  We will
+     *        call aObserver.OnStartRequest followed immediately by
+     *        aObserver.OnStopRequest.  It is recommended that the caller use
+     *        OnStopRequest to act on the link's status.  The underlying request
+     *        will not be cancelled until after OnStopRequest has been called.
+     * @param aContext
+     *        A closure that will be passed back to the nsIRequestObserver
+     *        methods.
+     */
+    void asyncCheck(in nsIRequestObserver aObserver, in nsISupports aContext);
+};