diff --git a/www/README.md b/www/README.md
index ba70e85c..e872a4cc 100644
--- a/www/README.md
+++ b/www/README.md
@@ -53,3 +53,5 @@ pc.ontrack = ev => {
 - https://www.webrtc-experiment.com/DetectRTC/
 - https://divtable.com/table-styler/
 - https://www.chromium.org/audio-video/
+- https://web.dev/i18n/en/fast-playback-with-preload/#manual_buffering
+- https://developer.mozilla.org/en-US/docs/Web/API/Media_Source_Extensions_API
diff --git a/www/webrtc.html b/www/webrtc.html
index 1fe9a9fc..9ab660bc 100644
--- a/www/webrtc.html
+++ b/www/webrtc.html
@@ -25,12 +25,12 @@
 <body>
 <video id="video" autoplay controls playsinline muted></video>
 <script>
+    const baseUrl = location.origin + location.pathname.substr(
+        0, location.pathname.lastIndexOf("/")
+    );
+
     function init(stream) {
         // support api_path
-        const baseUrl = location.origin + location.pathname.substr(
-            0, location.pathname.lastIndexOf("/")
-        );
-
         const ws = new WebSocket(`ws${baseUrl.substr(4)}/api/ws${location.search}`);
         ws.onopen = () => {
             console.debug('ws.onopen');
