chore: import upstream snapshot with attribution

doc/source/serve/doc_code/local_dev.py

@@ -0,0 +1,38 @@
+# __local_dev_start__
+# Filename: local_dev.py
+from starlette.requests import Request
+
+from ray import serve
+from ray.serve.handle import DeploymentHandle, DeploymentResponse
+
+
+@serve.deployment
+class Doubler:
+    def double(self, s: str):
+        return s + " " + s
+
+
+@serve.deployment
+class HelloDeployment:
+    def __init__(self, doubler: DeploymentHandle):
+        self.doubler = doubler
+
+    async def say_hello_twice(self, name: str):
+        return await self.doubler.double.remote(f"Hello, {name}!")
+
+    async def __call__(self, request: Request):
+        return await self.say_hello_twice(request.query_params["name"])
+
+
+app = HelloDeployment.bind(Doubler.bind())
+# __local_dev_end__
+
+# __local_dev_handle_start__
+handle: DeploymentHandle = serve.run(app)
+response: DeploymentResponse = handle.say_hello_twice.remote(name="Ray")
+assert response.result() == "Hello, Ray! Hello, Ray!"
+# __local_dev_handle_end__
+
+# __local_dev_testing_start__
+serve.run(app, _local_testing_mode=True)
+# __local_dev_testing_end__