diff --git a/eel/__init__.py b/eel/__init__.py
index 34fc7ce1..76f82938 100644
--- a/eel/__init__.py
+++ b/eel/__init__.py
@@ -527,13 +527,17 @@ def _safe_json(obj: Any) -> str:
     return jsn.dumps(obj, default=lambda o: None)
 
 
+import gevent.lock
+_ws_send_lock = gvt.lock.BoundedSemaphore(1)
+
 def _repeated_send(ws: WebSocketT, msg: str) -> None:
-    for attempt in range(100):
-        try:
-            ws.send(msg)
-            break
-        except Exception:
-            sleep(0.001)
+    with _ws_send_lock:  # ← 加这一行
+        for attempt in range(100):
+            try:
+                ws.send(msg)
+                break
+            except Exception:
+                sleep(0.001)
 
 
 def _process_message(message: Dict[str, Any], ws: WebSocketT) -> None:
diff --git a/eel/browsers.py b/eel/browsers.py
index 183dd905..873a3720 100644
--- a/eel/browsers.py
+++ b/eel/browsers.py
@@ -33,7 +33,10 @@ def _build_url_from_string(page: str, options: OptionsDictT) -> str:
     if not isinstance(options['port'], (int, str)):
         raise TypeError("'port' option must be an integer")
     base_url = 'http://%s:%d/' % (options['host'], int(options['port']))
-    return base_url + page
+    if "http" in page:
+        return page
+    else:
+        return base_url + page
 
 
 def _build_urls(start_pages: Iterable[Union[str, Dict[str, str]]], options: OptionsDictT) -> List[str]:
diff --git a/eel/eel.js b/eel/eel.js
index cc824206..8f8f3e10 100644
--- a/eel/eel.js
+++ b/eel/eel.js
@@ -1,5 +1,5 @@
 eel = {
-    _host: window.location.origin,
+    _host: new URL(document.currentScript.src).origin,
 
     set_host: function (hostname) {
         eel._host = hostname
diff --git a/examples/07 - CreateReactApp/eel_CRA.py b/examples/07 - CreateReactApp/eel_CRA.py
index 504256c0..a8e256c9 100644
--- a/examples/07 - CreateReactApp/eel_CRA.py	
+++ b/examples/07 - CreateReactApp/eel_CRA.py	
@@ -61,6 +61,7 @@ def start_eel(develop):
         host='localhost',
         port=8080,
         size=(1280, 800),
+        shutdown_delay=60  # Prevent disconnect when webpack hot refresh
     )
     try:
         eel.start(page, mode=app, **eel_kwargs)