[Bug] Cannot run "Serve a MobileNet image classifier on Kubernetes" doc

[MortalHappiness]

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KubeRay Component

ray-operator

What happened + What you expected to happen

Tested on Linux x86-64 machine.

Following the steps in this doc https://docs.ray.io/en/latest/cluster/kubernetes/examples/mobilenet-rayservice.html

The following error occurred when I execute kubectl port-forward and try to access the dashboard on localhost:8000

Unexpected error, traceback: �[36mray::ServeReplica:mobilenet:ImageClassifier.handle_request_streaming()�[39m (pid=266, ip=10.244.0.7)
  File "/home/ray/anaconda3/lib/python3.8/site-packages/ray/serve/_private/utils.py", line 165, in wrap_to_ray_error
    raise exception
  File "/home/ray/anaconda3/lib/python3.8/site-packages/ray/serve/_private/replica.py", line 895, in call_user_method
    result = await method_to_call(*request_args, **request_kwargs)
  File "/tmp/ray/session_2024-08-23_02-21-03_274153_14/runtime_resources/working_dir_files/https_github_com_ray-project_serve_config_examples_archive_b393e77bbd6aba0881e3d94c05f968f05a387b96/mobilenet/mobilenet.py", line 25, in __call__
    image_file = await request["image"].read()
  File "/home/ray/anaconda3/lib/python3.8/site-packages/starlette/datastructures.py", line 310, in __getitem__
    return self._dict[key]
KeyError: 'image'.

Reproduction script

Following the steps in the doc can reproduce this error.

Anything else

No response

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

[MortalHappiness]

Moved to ray-project/ray#47317