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#!/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())
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