diff --git a/setup.py b/setup.py
index 24f9a76..11477c4 100644
--- a/setup.py
+++ b/setup.py
@@ -29,7 +29,7 @@ def get_packages(package):
         'starlette<1',
         'apispec<4',
     ],
-    version='0.0.12',
+    version='0.0.13',
     url='https://github.com/slv0/start_resty',
     license='BSD',
     description='The web framework',
diff --git a/star_resty/apidocs/route.py b/star_resty/apidocs/route.py
index 5a3ba45..9d0f067 100644
--- a/star_resty/apidocs/route.py
+++ b/star_resty/apidocs/route.py
@@ -1,7 +1,7 @@
-from typing import Sequence, Union
+from typing import Sequence
 
 from apispec import APISpec
-from starlette.routing import Route, Mount
+from starlette.routing import BaseRoute, Mount, Route
 
 from .operation import setup_route_operations
 from .utils import convert_path
@@ -9,7 +9,7 @@
 __all__ = ('setup_routes',)
 
 
-def setup_routes(routes: Sequence[Union[Route, Mount]],
+def setup_routes(routes: Sequence[BaseRoute],
                  spec: APISpec, version: int = 2,
                  add_head_methods: bool = False,
                  path: str = ''):
@@ -18,14 +18,15 @@ def setup_routes(routes: Sequence[Union[Route, Mount]],
             setup_routes(route.routes, spec, version=version, add_head_methods=add_head_methods,
                          path=f'{path}{route.path}')
             continue
-        elif isinstance(route, Route) and not route.include_in_schema:
-            continue
+        elif isinstance(route, Route):
+            if not route.include_in_schema:
+                continue
 
-        endpoint = getattr(route.endpoint, '__endpoint__', None)
-        if endpoint is None:
-            continue
+            endpoint = getattr(route.endpoint, '__endpoint__', None)
+            if endpoint is None:
+                continue
 
-        operations = setup_route_operations(route, endpoint, version=version,
-                                            add_head_methods=add_head_methods)
-        route_path = f'{path}{route.path}'
-        spec.path(convert_path(route_path), operations=operations)
+            operations = setup_route_operations(route, endpoint, version=version,
+                                                add_head_methods=add_head_methods)
+            route_path = f'{path}{route.path}'
+            spec.path(convert_path(route_path), operations=operations)
diff --git a/star_resty/apidocs/setup.py b/star_resty/apidocs/setup.py
index 18d90b0..3a80b26 100644
--- a/star_resty/apidocs/setup.py
+++ b/star_resty/apidocs/setup.py
@@ -5,7 +5,7 @@
 from apispec.ext.marshmallow import MarshmallowPlugin
 from starlette.applications import Starlette
 from starlette.requests import Request
-from starlette.responses import UJSONResponse
+from starlette.responses import JSONResponse
 
 from .route import setup_routes
 from .utils import resolve_schema_name
@@ -35,19 +35,19 @@ def setup_spec(app: Starlette, title: str,
         plugins=[MarshmallowPlugin(schema_name_resolver=resolve_schema_name)],
         **{'swagger': openapi_version, 'basePath': base_path, **options, **kwargs}
     )
-    initialized = False
+    api_spec = None
 
     @app.route(route, include_in_schema=False)
     def generate_api_docs(_: Request):
-        nonlocal initialized
+        nonlocal api_spec
         nonlocal spec
-        if not initialized:
+        if api_spec is None:
             logger.info('initialize open api schema')
             setup_routes(app.routes, spec, version=get_open_api_version(openapi_version)
                          , add_head_methods=add_head_methods)
-            initialized = True
+            api_spec = spec.to_dict()
 
-        return UJSONResponse(spec.to_dict())
+        return JSONResponse(api_spec)
 
 
 def get_open_api_version(version: str) -> int: