Add get_url helper, deprecate base_url (#35224)

homeassistant/__main__.py

@@ -8,6 +8,8 @@ import sys
 import threading
 from typing import List
 
+import yarl
+
 from homeassistant.const import REQUIRED_PYTHON_VER, RESTART_EXIT_CODE, __version__
 
 
@@ -256,10 +258,17 @@ async def setup_and_run_hass(config_dir: str, args: argparse.Namespace) -> int:
     if hass is None:
         return 1
 
-    if args.open_ui and hass.config.api is not None:
+    if args.open_ui:
         import webbrowser  # pylint: disable=import-outside-toplevel
 
-        hass.add_job(webbrowser.open, hass.config.api.base_url)
+        if hass.config.api is not None:
+            scheme = "https" if hass.config.api.use_ssl else "http"
+            url = str(
+                yarl.URL.build(
+                    scheme=scheme, host="127.0.0.1", port=hass.config.api.port
+                )
+            )
+            hass.add_job(webbrowser.open, url)
 
     return await hass.async_run()