diff --git a/packages/kernel/py/stlite-server/stlite_server/bootstrap.py b/packages/kernel/py/stlite-server/stlite_server/bootstrap.py
index 0d68ea7b7..a80865824 100644
--- a/packages/kernel/py/stlite-server/stlite_server/bootstrap.py
+++ b/packages/kernel/py/stlite-server/stlite_server/bootstrap.py
@@ -38,7 +38,7 @@ def _fix_sys_path(main_script_path: str) -> None:
     sys.path.insert(0, os.path.dirname(main_script_path))
 
 
-def _fix_sys_argv(main_script_path: str, args: List[str]) -> None:
+def _fix_sys_argv(main_script_path: str, args: list[str]) -> None:
     """sys.argv needs to exclude streamlit arguments and parameters
     and be set to what a user's script may expect.
     """
diff --git a/packages/kernel/py/stlite-server/stlite_server/media_file_handler.py b/packages/kernel/py/stlite-server/stlite_server/media_file_handler.py
index b2a9c897e..b79e8f721 100644
--- a/packages/kernel/py/stlite-server/stlite_server/media_file_handler.py
+++ b/packages/kernel/py/stlite-server/stlite_server/media_file_handler.py
@@ -66,9 +66,11 @@ def get(self, request: Request, path: str) -> Response:  # type: ignore[override
                 # Check that the value can be encoded in latin1. Latin1 is
                 # the default encoding for headers.
                 filename.encode("latin1")
-                file_expr = 'filename="{}"'.format(filename)
+                file_expr = f'filename="{filename}"'
             except UnicodeEncodeError:
-                file_expr = "filename*=UTF-8''{}".format(quote(filename))
+                # RFC5987 syntax.
+                # See: https://datatracker.ietf.org/doc/html/rfc5987
+                file_expr = f"filename*=utf-8''{quote(filename)}"
 
             headers["Content-Disposition"] = "attachment; " + file_expr
 
diff --git a/packages/kernel/py/stlite-server/stlite_server/server.py b/packages/kernel/py/stlite-server/stlite_server/server.py
index 3d715e740..05142b7bc 100644
--- a/packages/kernel/py/stlite-server/stlite_server/server.py
+++ b/packages/kernel/py/stlite-server/stlite_server/server.py
@@ -22,7 +22,7 @@
 from .server_util import make_url_path_regex
 from .upload_file_request_handler import UploadFileRequestHandler
 
-LOGGER = logging.getLogger(__name__)
+_LOGGER: Final = logging.getLogger(__name__)
 
 # These route definitions are copied from the original impl at https://github.com/streamlit/streamlit/blob/1.27.0/lib/streamlit/web/server/server.py#L83-L92  # noqa: E501
 MEDIA_ENDPOINT: Final = "/media"
@@ -34,7 +34,7 @@
 class Server:
     _routes: list[tuple[re.Pattern, RequestHandler]] = []
 
-    def __init__(self, main_script_path: str, command_line: str | None) -> None:
+    def __init__(self, main_script_path: str) -> None:
         self._main_script_path = main_script_path
 
         self._media_file_storage = MemoryMediaFileStorage(MEDIA_ENDPOINT)
@@ -44,10 +44,11 @@ def __init__(self, main_script_path: str, command_line: str | None) -> None:
         self._runtime = Runtime(
             RuntimeConfig(
                 script_path=main_script_path,
-                command_line=command_line,
+                command_line=None,
                 media_file_storage=self._media_file_storage,
                 uploaded_file_manager=uploaded_file_mgr,
                 cache_storage_manager=MemoryCacheStorageManager(),
+                is_hello=False,
             ),
         )
 
@@ -59,9 +60,9 @@ async def start(self) -> None:
         When this returns, Streamlit is ready to accept new sessions.
         """
 
-        LOGGER.debug("Starting server...")
+        _LOGGER.debug("Starting server...")
 
-        # In stlite, impl, we deal with WebSocket separately.
+        # In stlite, we deal with WebSocket separately.
         self._websocket_handler = WebSocketHandler(self._runtime)
 
         # Based on the original impl at https://github.com/streamlit/streamlit/blob/1.18.1/lib/streamlit/web/server/server.py#L221  # noqa: E501
@@ -105,7 +106,7 @@ def receive_websocket_from_js(self, payload_from_js: pyodide.ffi.JsProxy):
         payload = payload_from_js.to_bytes()
 
         if not isinstance(payload, bytes):
-            LOGGER.warning(
+            _LOGGER.warning(
                 "The WebSocket payload is not of type bytes, but %s", type(payload)
             )
             return
@@ -144,7 +145,7 @@ def receive_http(
         body: str | bytes,
         on_response: Callable[[int, dict, bytes], None],
     ):
-        LOGGER.debug("HTTP request (%s %s %s %s)", method, path, headers, body)
+        _LOGGER.debug("HTTP request (%s %s %s %s)", method, path, headers, body)
 
         url_parse_result = urllib.parse.urlparse(path)
         path = url_parse_result.path
@@ -270,10 +271,10 @@ def on_message(self, payload: str | bytes) -> None:
 
             msg = BackMsg()
             msg.ParseFromString(payload)
-            LOGGER.debug("Received the following back message:\n%s", msg)
+            _LOGGER.debug("Received the following back message:\n%s", msg)
 
         except Exception as ex:
-            LOGGER.error(ex)
+            _LOGGER.error(ex)
             self._runtime.handle_backmsg_deserialization_exception(self._session_id, ex)
             return
 
diff --git a/packages/kernel/py/stlite-server/tests/test_server.py b/packages/kernel/py/stlite-server/tests/test_server.py
index 2055efe6f..cff5d4973 100644
--- a/packages/kernel/py/stlite-server/tests/test_server.py
+++ b/packages/kernel/py/stlite-server/tests/test_server.py
@@ -38,7 +38,7 @@ def setup_server():
 
     async def init_server():
         """Mimic streamlit.web.bootstrap.run()"""
-        server = Server(filename, None)
+        server = Server(filename)
         await server.start()
         data_from_thread["server"] = server
         event.set()