name : web_rewrite_headers_middleware.py #!/usr/bin/env python3 """Example for rewriting response headers by middleware.""" from aiohttp import web from aiohttp.typedefs import Handler async def handler(request): return web.Response(text="Everything is fine") @web.middleware async def middleware(request: web.Request, handler: Handler) -> web.StreamResponse: try: response = await handler(request) except web.HTTPException as exc: raise exc if not response.prepared: response.headers["SERVER"] = "Secured Server Software" return response def init(): app = web.Application(middlewares=[middleware]) app.router.add_get("/", handler) return app web.run_app(init())