Is the OpenAI-compatible API sending the `functions` argument to the model?

I'm currently using the OS model functionary, which supports functions in a manner similar to how GPT operates through the OpenAI API. I've successfully deployed the model worker and proceeded to make chat completion requests using the functions feature:

curl {API}/chat/completions   -H "Content-Type: application/json"   -d '{
    "model": "functionary-7b",
    "messages": [{"role": "user", "content": "salute Anthony"}],
  "functions": [
    {"name": "salute",
    "description": "This function can be used to salute someone.",
    "parameters": {
      "properties": {
        "who": {
          "description": "Name of whom to salute. o7",
          "title": "Who",
          "type": "string"
        }
      },
      "required": [
        "who"
      ],
      "title": "salute",
      "type": "object"
    }
  }]
  }'

The expected outcome was to receive a message that included the function_call argument, indicating the use of the salute function with the argument Anthony. However, the actual result was as follows:

{"id":"chatcmpl-fUcuEKMeCkavtjsPCzeKft","object":"chat.completion","created":1694683275,"model":"functionary-7b","choices":[{"index":0,"message":{"role":"assistant","content":"\nSalute!\n"},"finish_reason":"stop"}],"usage":{"prompt_tokens":579,"total_tokens":585,"completion_tokens":6}}

It appears that the functions argument is being ignored altogether. My question is whether fastchat/serve/openai_api_server.py is indeed sending the functions argument to the model.

Start with fastchat/serve/openai_api_server.py and trace how the OpenAI-compatible chat completion request handles the functions field. Reproduce the provided curl request against the functionary-7b model, then verify whether functions reaches the model and whether the response includes the expected function_call data.