add prefix to config setting

doc/quickstart.rst

@@ -225,7 +225,7 @@ You can also match parts of the path as variables to your resource methods.
     If a request does not match any of your application's endpoints,
     Flask-RESTX will return a 404 error message with suggestions of other
     endpoints that closely match the requested endpoint.
-    This can be disabled by setting ``ERROR_404_HELP`` to ``False`` in your application config.
+    This can be disabled by setting ``RESTX_ERROR_404_HELP`` to ``False`` in your application config.
 
 
 Argument Parsing

flask_restx/api.py

@@ -9,6 +9,7 @@
 import re
 import six
 import sys
+import warnings
 
 from collections import OrderedDict
 from functools import wraps, partial
@@ -219,6 +220,7 @@ def init_app(self, app, **kwargs):
         else:
             self.blueprint = app
 
+
     def _init_app(self, app):
         """
         Perform initialization actions with the given :class:`flask.Flask` object.
@@ -250,6 +252,16 @@ def _init_app(self, app):
         app.config.setdefault("RESTX_MASK_SWAGGER", True)
         app.config.setdefault("RESTX_INCLUDE_ALL_MODELS", False)
 
+        # check for deprecated config variable names
+        if "ERROR_404_HELP" in app.config:
+            app.config['RESTX_ERROR_404_HELP'] = app.config['ERROR_404_HELP']
+            warnings.warn(
+                "'ERROR_404_HELP' config setting is deprecated and will be "
+                "removed in the future. Use 'RESTX_ERROR_404_HELP' instead.",
+                DeprecationWarning
+            )
+
+
     def __getattr__(self, name):
         try:
             return getattr(self.default_namespace, name)
@@ -709,7 +721,7 @@ def handle_error(self, e):
 
         elif (
             code == HTTPStatus.NOT_FOUND
-            and current_app.config.get("ERROR_404_HELP", True)
+            and current_app.config.get("RESTX_ERROR_404_HELP", True)
             and include_message_in_response
         ):
             data["message"] = self._help_on_404(data.get("message", None))

tests/test_errors.py

@@ -480,7 +480,7 @@ def test_handle_smart_errors(self, app):
             assert response.status_code == 404
             assert "did you mean /foo ?" in response.data.decode()
 
-        app.config["ERROR_404_HELP"] = False
+        app.config["RESTX_ERROR_404_HELP"] = False
 
         response = api.handle_error(NotFound())
         assert response.status_code == 404