Bug 1122642 - Have an error page for H2 INADEQUATE_SECURITY r=mcmanus,bz

docshell/base/nsDocShell.cpp

@@ -5057,6 +5057,11 @@ nsDocShell::DisplayLoadError(nsresult aError, nsIURI* aURI,
         // ServiceWorker intercepted request, but something went wrong.
         error.AssignLiteral("corruptedContentError");
         break;
+      case NS_ERROR_NET_INADEQUATE_SECURITY:
+        // Server negotiated bad TLS for HTTP/2.
+        error.AssignLiteral("inadequateSecurityError");
+        addHostPort = true;
+        break;
       default:
         break;
     }
@@ -7796,6 +7801,7 @@ nsDocShell::EndPageLoad(nsIWebProgress* aProgress,
                aStatus == NS_ERROR_UNSAFE_CONTENT_TYPE ||
                aStatus == NS_ERROR_REMOTE_XUL ||
                aStatus == NS_ERROR_INTERCEPTION_FAILED ||
+               aStatus == NS_ERROR_NET_INADEQUATE_SECURITY ||
                NS_ERROR_GET_MODULE(aStatus) == NS_ERROR_MODULE_SECURITY) {
       // Errors to be shown for any frame
       DisplayLoadError(aStatus, url, nullptr, aChannel);