server.py

from fastapi import FastAPI, Request
from fastapi.responses import JSONResponse

app = FastAPI()

@app.post("/v1/chat/completions")
async def chat_completions(request: Request):
    body = await request.json()

    print("\n===== 📥 Incoming Request Body =====")
    print(body)
    print("====================================\n")

    # OpenAI 응답 형식 흉내내기
    return JSONResponse({
        "id": "chatcmpl-mock",
        "object": "chat.completion",
        "created": 1234567890,
        "model": body.get("model", "mock-model"),
        "choices": [
            {
                "index": 0,
                "message": {
                    "role": "assistant",
                    "content": "This is a mock response."
                },
                "finish_reason": "stop"
            }
        ],
        "usage": {
            "prompt_tokens": 10,
            "completion_tokens": 5,
            "total_tokens": 15
        }
    })