Fix property raised instead of returned (#17595)

src/lightning/app/api/http_methods.py

@@ -71,7 +71,7 @@ class _FastApiMockRequest:
 
     @property
     def method(self):
-        raise self._method
+        return self._method
 
     @property
     def headers(self):

tests/tests_app/core/test_lightning_api.py

@@ -485,6 +485,7 @@ class FlowAPI(LightningFlow):
         assert request.body()
         assert request.json()
         assert request.headers
+        assert request.method
         return OutputRequestModel(name=config.name, counter=self.counter)
 
     def configure_api(self):