1 files changed, 35 insertions, 0 deletions
diff --git a/docshell/base/nsILoadURIDelegate.idl b/docshell/base/nsILoadURIDelegate.idl
new file mode 100644
index 0000000000..eb5d4cbaf5
--- /dev/null
+++ b/docshell/base/nsILoadURIDelegate.idl
@@ -0,0 +1,35 @@
+/* -*- 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 nsIURI;
+interface nsIPrincipal;
+
+/**
+ * The nsILoadURIDelegate interface.
+ * Used for delegating URI loads to GeckoView's application, e.g., Custom Tabs
+ * or Progressive Web Apps.
+ */
+[scriptable, uuid(78e42d37-a34c-4d96-b901-25385669aba4)]
+interface nsILoadURIDelegate : nsISupports
+{
+  /**
+   * Delegates page load error handling. This may be called for either top-level
+   * loads or subframes.
+   *
+   * @param aURI The URI that failed to load.
+   * @param aError The error code.
+   * @param aErrorModule The error module code.
+
+   * Returns an error page URL to load, or null to show the default error page.
+   * No error page is shown at all if an error is thrown.
+   */
+  nsIURI
+  handleLoadError(in nsIURI aURI, in nsresult aError, in short aErrorModule);
+};