1 files changed, 8 insertions, 1 deletions
diff --git a/ext/websocket/01_websocket.js b/ext/websocket/01_websocket.js
index 635979174..3f4e16b90 100644
--- a/ext/websocket/01_websocket.js
+++ b/ext/websocket/01_websocket.js
@@ -19,6 +19,7 @@ import {
   MessageEvent,
 } from "ext:deno_web/02_event.js";
 import { Blob, BlobPrototype } from "ext:deno_web/09_file.js";
+import { getLocationHref } from "ext:deno_web/12_location.js";
 const primordials = globalThis.__bootstrap.primordials;
 const {
   ArrayBufferPrototype,
@@ -143,11 +144,17 @@ class WebSocket extends EventTarget {
     let wsURL;
 
     try {
-      wsURL = new URL(url);
+      wsURL = new URL(url, getLocationHref());
     } catch (e) {
       throw new DOMException(e.message, "SyntaxError");
     }
 
+    if (wsURL.protocol === "http:") {
+      wsURL.protocol = "ws:";
+    } else if (wsURL.protocol === "https:") {
+      wsURL.protocol = "wss:";
+    }
+
     if (wsURL.protocol !== "ws:" && wsURL.protocol !== "wss:") {
       throw new DOMException(
         "Only ws & wss schemes are allowed in a WebSocket URL.",