Class GZipMiddleware

starlette/middleware/gzip.py:44–78

class GZipMiddleware:
    def __init__(
        self,
        app: ASGIApp,
        minimum_size: int = 500,
        compresslevel: int = 9,
        thread_minimum_size: int = 128 * 1024,  # 128 KiB
        *,
        exclude_content_types: tuple[str, ...] = DEFAULT_EXCLUDED_CONTENT_TYPES,
    ) -> None:
        self.app = app
        self.minimum_size = minimum_size
        self.compresslevel = compresslevel
        self.thread_minimum_size = thread_minimum_size
        self.exclude_content_types = _normalize_content_types(exclude_content_types)

    async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None:
        if scope["type"] != "http":  # pragma: no cover
            await self.app(scope, receive, send)
            return

        headers = Headers(scope=scope)
        responder: ASGIApp
        if "gzip" in headers.get("Accept-Encoding", ""):
            responder = GZipResponder(
                self.app,
                self.minimum_size,
                compresslevel=self.compresslevel,
                thread_minimum_size=self.thread_minimum_size,
                exclude_content_types=self.exclude_content_types,
            )
        else:
            responder = IdentityResponder(self.app, self.minimum_size, exclude_content_types=self.exclude_content_types)

        await responder(scope, receive, send)


class IdentityResponder: