fastapi自定义中间件

1、自定义中间件类

from fastapi import Request
from starlette.middleware.base import BaseHTTPMiddleware

class MyMiddleware(BaseHTTPMiddleware):
    def __init__(self, app,*args, **kwargs):
        super().__init__(app,*args, **kwargs)

    async def dispatch(self, request: Request, call_next):
        print("MyMiddleware =============================== ")
        # 接收来自客户端的Request请求；
        headers = dict(request.scope['headers'])
        # 将Request请求传回原路由
        response = await call_next(request)
        return response

2、使用自定义中间件

app.add_middleware(MyMiddleware)

3、中间件执行顺序，从下往上执行

app.add_middleware(xx1)
app.add_middleware(xx2)

会先执行xx2再执行xx1