[FIX] fastapi: Compatibility with latest Odoo

From odoo/odoo@cb1d057, the orignal werkzeug request is wrapped in a dedicated class to keep under control the attributes developers use. This change add code to make the fastapi addon working with version including this last change and prior version

refs #414

fastapi/fastapi_dispatcher.py

@@ -42,8 +42,11 @@ def _make_response(self, status_mapping, headers_tuple, content):
         self.headers = dict(headers_tuple)
 
     def _get_environ(self):
-        environ = self.request.httprequest.environ
-        environ["wsgi.input"] = self.request.httprequest._get_stream_for_parsing()
+        httprequest = self.request.httprequest
+        if hasattr(httprequest, "_HTTPRequest__wrapped"):
+            httprequest = httprequest._HTTPRequest__wrapped
+        environ = httprequest.environ
+        environ["wsgi.input"] = httprequest._get_stream_for_parsing()
         return environ
 
     @contextmanager