Remove custom page config

jupyter_server/serverapp.py

@@ -401,8 +401,6 @@ def init_settings(
             # collapse $HOME to ~
             root_dir = "~" + root_dir[len(home) :]
 
-        self.allow_custom_env_variables = jupyter_app.allow_custom_env_variables
-
         settings = {
             # basics
             "log_function": log_request,
@@ -461,8 +459,7 @@ def init_settings(
             "allow_password_change": jupyter_app.allow_password_change,
             "server_root_dir": root_dir,
             "jinja2_env": env,
-            "serverapp": jupyter_app,
-            "page_config_hook": (self.page_config_hook),
+            "serverapp": jupyter_app
         }
 
         # allow custom overrides for the tornado web app.
@@ -473,10 +470,6 @@ def init_settings(
             settings["xsrf_cookie_kwargs"] = {"path": base_url}
         return settings
 
-    def page_config_hook(self, handler, page_config):
-        page_config["allow_custom_env_variables"] = self.allow_custom_env_variables
-        return page_config
-
     def init_handlers(self, default_services, settings):
         """Load the (URL pattern, handler) tuples for each component."""
         # Order matters. The first handler to match the URL will handle the request.
@@ -1434,10 +1427,10 @@ def _default_allow_remote(self) -> bool:
                         """,
     )
 
-    allow_custom_env_variables = Bool(
+    allow_setup_custom_env_variables = Bool(
         False,
         config=True,
-        help="""Allow to use custom env variables""",
+        help="""Allow a user to setup custom env variables while launching or selecting a kernel""",
     )
 
     browser = Unicode(