标签: OAuth2

第一章：中间件基础

什么是中间件？

中间件是在每个请求被处理之前和每个响应返回之前执行的代码。它可以用于：

请求/响应日志记录
认证和授权
CORS 处理
请求限流
错误处理
响应压缩

基础中间件

from fastapi import FastAPI, Request
from starlette.middleware.base import BaseHTTPMiddleware
from starlette.responses import Response
import time
import logging

app = FastAPI()
logger = logging.getLogger(__name__)

# 使用装饰器创建中间件
@app.middleware("http")
async def add_process_time_header(request: Request, call_next):
    start_time = time.time()
    response = await call_next(request)
    process_time = time.time() - start_time
    response.headers["X-Process-Time"] = str(process_time)
    return response

# 请求日志中间件
@app.middleware("http")
async def log_requests(request: Request, call_next):
    logger.info(f"Request: {request.method} {request.url}")
    response = await call_next(request)
    logger.info(f"Response: {response.status_code}")
    return response

HSXISAWD2026/3/20大约 9 分钟