astro/dist/core/routing/invalid-encoding.js

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/**
* Returns an empty `400 Bad Request` response when the request path was
* encoded too many times to fully decode (`state.invalidEncoding`), or
* `undefined` otherwise.
*
* Every entry point that routes the request or runs middleware calls this
* first, so composable pipelines reject the request the same way
* `handleRequest` does regardless of which handlers they include.
*/
export function rejectInvalidEncoding(state) {
	// If the half-decoded path were let through, middleware could check one
	// path while a later decode turns it into a different route.
	if (state.invalidEncoding) {
		return new Response(null, {
			status: 400,
			statusText: "Bad Request"
		});
	}
	return undefined;
}