starlette/docs/endpoints.md

Starlette includes an HTTPEndpoint class that provides a class-based view pattern which handles HTTP method dispatching.

The HTTPEndpoint class can be used as an ASGI application:

from starlette.responses import PlainTextResponse
from starlette.endpoints import HTTPEndpoint


class App(HTTPEndpoint):
    async def get(self, request):
        return PlainTextResponse(f"Hello, world!")

If you're using a Starlette application instance to handle routing, you can dispatch to an HTTPEndpoint class by using the @app.route() decorator, or the app.add_route() function. Make sure to dispatch to the class itself, rather than to an instance of the class:

from starlette.applications import Starlette
from starlette.responses import PlainTextResponse
from starlette.endpoints import HTTPEndpoint


app = Starlette()


@app.route("/")
class Homepage(HTTPEndpoint):
    async def get(self, request):
        return PlainTextResponse(f"Hello, world!")


@app.route("/{username}")
class User(HTTPEndpoint):
    async def get(self, request, username):
        return PlainTextResponse(f"Hello, {username}")

HTTP endpoint classes will respond with "405 Method not allowed" responses for any request methods which do not map to a corresponding handler.