diff --git a/jupyterlab_server/handlers.py b/jupyterlab_server/handlers.py
index 79df953..16890a3 100644
--- a/jupyterlab_server/handlers.py
+++ b/jupyterlab_server/handlers.py
@@ -82,10 +82,17 @@ def get_page_config(self) -> dict[str, Any]:
         server_root = self.settings.get("server_root_dir", "")
         server_root = server_root.replace(os.sep, "/")
         base_url = self.settings.get("base_url")
+        server_app = self.settings.get("serverapp")
+        assert server_app is not None
+        if hasattr(server_app, "accept_kernel_env_vars"):
+            accept_kernel_env_vars = server_app.accept_kernel_env_vars
+        else:
+            accept_kernel_env_vars = False
 
         # Remove the trailing slash for compatibility with html-webpack-plugin.
         full_static_url = self.static_url_prefix.rstrip("/")
         page_config.setdefault("fullStaticUrl", full_static_url)
+        page_config.setdefault("accept_kernel_env_vars", accept_kernel_env_vars)
 
         page_config.setdefault("terminalsAvailable", terminals)
         page_config.setdefault("ignorePlugins", [])
diff --git a/tests/test_labapp.py b/tests/test_labapp.py
index d7e39dd..6f2a525 100644
--- a/tests/test_labapp.py
+++ b/tests/test_labapp.py
@@ -60,6 +60,7 @@ def ispath(p):
 
     nondirs = {k: v for k, v in page_config.items() if not ispath(k)}
     assert nondirs == {
+        "accept_kernel_env_vars": False,
         "appName": "JupyterLab Server Application",
         "appNamespace": "jupyterlab_server",
         "appUrl": "/lab",