diff --git a/fastapi/fastapi_dispatcher.py b/fastapi/fastapi_dispatcher.py
index 79b80b753..27faee852 100644
--- a/fastapi/fastapi_dispatcher.py
+++ b/fastapi/fastapi_dispatcher.py
@@ -28,10 +28,13 @@ def dispatch(self, endpoint, args):
         self.request.params = {}  # dict(self.request.get_http_params(), **args)
         environ = self._get_environ()
         path = environ["PATH_INFO"]
+        endpoint_model = request.env["fastapi.endpoint"].sudo()
+        # Ensure that only one app exists by endpoint's root path
+        root_path = endpoint_model._get_root_path(path) or path
         # TODO store the env into contextvar to be used by the odoo_env
         # depends method
-        with fastapi_app_pool.get_app(env=request.env, root_path=path) as app:
-            uid = request.env["fastapi.endpoint"].sudo().get_uid(path)
+        with fastapi_app_pool.get_app(env=request.env, root_path=root_path) as app:
+            uid = endpoint_model.get_uid(root_path)
             data = BytesIO()
             with self._manage_odoo_env(uid):
                 for r in app(environ, self._make_response):
diff --git a/fastapi/models/fastapi_endpoint.py b/fastapi/models/fastapi_endpoint.py
index 388e56a6d..ee3c94424 100644
--- a/fastapi/models/fastapi_endpoint.py
+++ b/fastapi/models/fastapi_endpoint.py
@@ -266,6 +266,17 @@ def _get_id_for_path(self, path):
         root_path = self._find_first_matching_url_path(id_by_path.keys(), path)
         return id_by_path.get(root_path)
 
+    @api.model
+    def _get_root_path(self, path):
+        """Return the root path of the endpoint that serves the given path.
+
+        Not cached on the path: a request path can contain anything, so caching
+        on it would keep one entry per distinct path.
+        """
+        return self._find_first_matching_url_path(
+            self._get_id_by_root_path_map().keys(), path
+        )
+
     @api.model
     def _get_endpoint(self, path):
         id_ = self._get_id_for_path(path)
diff --git a/fastapi/tests/test_fastapi.py b/fastapi/tests/test_fastapi.py
index e074325e0..7525372ec 100644
--- a/fastapi/tests/test_fastapi.py
+++ b/fastapi/tests/test_fastapi.py
@@ -11,6 +11,7 @@
 
 from fastapi import status
 
+from ..pools import fastapi_app_pool
 from ..schemas import DemoExceptionType
 
 
@@ -195,6 +196,17 @@ def test_url_matching(self):
             "/fastapi/v1",
         )
 
+    def test_app_pool_keyed_on_root_path(self):
+        # Calls to endpoints under the same root path are processed by the same
+        # app: only one app is initialized by root path
+        for route in ("/fastapi_demo/demo", "/fastapi_demo/demo/lang"):
+            response = self.url_open(route, timeout=20)
+            self.assertEqual(response.status_code, 200)
+        pools = fastapi_app_pool._queue_by_db_by_root_path[self.env.cr.dbname]
+        self.assertIn(self.fastapi_demo_app.root_path, pools)
+        self.assertNotIn("/fastapi_demo/demo", pools)
+        self.assertNotIn("/fastapi_demo/demo/lang", pools)
+
     def test_multi_slash(self):
         route = "/fastapi/demo-multi/demo/"
         response = self.url_open(route, timeout=20)