import time

from fastapi import FastAPI, Request

app = FastAPI()


@app.middleware("http")
async def add_process_time_header(request: Request, call_next):
    start_time = time.perf_counter()
    response = await call_next(request)
    process_time = time.perf_counter() - start_time
    response.headers["X-Process-Time"] = str(process_time)

        from typing import Awaitable, Callable

        from fastapi import FastAPI, Request, Response

        app = FastAPI()


        @app.middleware("http")
        async def add_process_time_header(
            request: Request, call_next: Callable[[Request], Awaitable[Response]]
        ) -> Response:
            start_time = time.time()
            response = await call_next(request)