chore: import upstream snapshot with attribution

doc/source/serve/doc_code/varying_deps.py

@@ -0,0 +1,41 @@
+import requests
+from starlette.requests import Request
+
+from ray import serve
+from ray.serve.handle import DeploymentHandle
+
+
+@serve.deployment
+class Ingress:
+    def __init__(
+        self, ver_25_handle: DeploymentHandle, ver_26_handle: DeploymentHandle
+    ):
+        self.ver_25_handle = ver_25_handle
+        self.ver_26_handle = ver_26_handle
+
+    async def __call__(self, request: Request):
+        if request.query_params["version"] == "25":
+            return await self.ver_25_handle.remote()
+        else:
+            return await self.ver_26_handle.remote()
+
+
+@serve.deployment
+def requests_version():
+    return requests.__version__
+
+
+ver_25 = requests_version.options(
+    name="25",
+    ray_actor_options={"runtime_env": {"pip": ["requests==2.25.1"]}},
+).bind()
+ver_26 = requests_version.options(
+    name="26",
+    ray_actor_options={"runtime_env": {"pip": ["requests==2.26.0"]}},
+).bind()
+
+app = Ingress.bind(ver_25, ver_26)
+serve.run(app)
+
+assert requests.get("http://127.0.0.1:8000/?version=25").text == "2.25.1"
+assert requests.get("http://127.0.0.1:8000/?version=26").text == "2.26.0"