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Co-authored-by: Zhuohan Li <zhuohan123@gmail.com>

Signed-off-by: Antoni Baum <antoni.baum@protonmail.com>
Co-authored-by: Avnish Narayan <38871737+avnishn@users.noreply.github.com>

Co-authored-by: hao.yu <hao.yu@cn-c017.server.mila.quebec>

[Server] use fastchat.model.model_adapter.get_conversation_template method to get model template (#357)

* allow str or List[str] for prompt

* Update vllm/entrypoints/openai/api_server.py
Co-authored-by: Zhuohan Li <zhuohan123@gmail.com>

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Co-authored-by: Zhuohan Li <zhuohan123@gmail.com>