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首先声明，个人建议，不要有什么code、message，直接返回data给前端就好，status_code小于300就是成功，大于等于400就是失败。
但有些项目，确实不方便有200以外的status_code或是需要统一响应字段为code/message/data
查了好几个博文，都没看到很满意的写法，Response[T]的方式虽然很Pythonic，但既然已经跟前端约定好字段了，文档里只需展示data就好，无需再展示code和message
最终样例如下：
# app/main.py
from fastapi import FastAPIapp = FastAPI()@app.middleware("http")
async def add_process_time_header(request: Request, call_next):start = datetime.now()path = request.url.pathtry:response = await call_next(request)except Exception:code = int(datetime.now().timestamp())error = traceback.format_exc()logger.error(f"{path=}; {code=}; error:\n{error}")detail = f"数据异常，请刷新页面后重试！({code})"if request.url.path.split("/")[-1].startswith("_"):# 内部接口直接返回错误详情detail = f"{code=}; {error = }"response = JSONResponse({"code": 500, "message": detail, "data": None}, 500)else:if ((sc := response.status_code) < 300and not path.endswith("openapi.json")and ("json" in response.headers["content-type"])):content = b""async for chunk in response.body_iterator:content += chunktry:data = orjson.loads(content)except Exception as e:logger.exception(e)response = JSONResponse({"code": 500, "message": str(e), "data": None}, 500)else:response = JSONResponse({"code": 0, "message": "OK", "data": data}, sc)end = datetime.now()process_time = end - startcost = f"{round(process_time.total_seconds() * 1000, 3)} ms"logger.info(f"{start} --> {end} || Cost: {cost}")response.headers["X-Process-Time"] = costreturn response