Add missing window.origin

Author: dunglas

mercure.rst

@@ -210,7 +210,7 @@ as patterns:
 .. code-block:: javascript
 
     // URL is a built-in JavaScript class to manipulate URLs
-    const url = new URL('/.well-known/mercure');
+    const url = new URL('/.well-known/mercure', window.origin);
     url.searchParams.append('topic', 'http://example.com/books/1');
     // Subscribe to updates of several Book resources
     url.searchParams.append('topic', 'http://example.com/books/2');
@@ -286,7 +286,7 @@ and to subscribe to it:
             const hubUrl = response.headers.get('Link').match(/<([^>]+)>;\s+rel=(?:mercure|"[^"]*mercure[^"]*")/)[1];
 
             // Append the topic(s) to subscribe as query parameter
-            const hub = new URL(hubUrl);
+            const hub = new URL(hubUrl, window.origin);
             hub.searchParams.append('topic', 'http://example.com/books/{id}');
 
             // Subscribe to updates