LibWeb: Implement 'Should response be blocked due to nosniff?' AO

Author: https://github.com/linusg
Commit: 58ad6de954
Pull-request: https://github.com/SerenityOS/serenity/pull/15795
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/davidot ✅

Userland/Libraries/LibWeb/Fetch/Infrastructure/NoSniffBlocking.h

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2022, Linus Groh <linusg@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Forward.h>
+#include <LibWeb/Fetch/Infrastructure/RequestOrResponseBlocking.h>
+#include <LibWeb/Forward.h>
+
+namespace Web::Fetch::Infrastructure {
+
+ErrorOr<bool> determine_nosniff(HeaderList const&);
+ErrorOr<RequestOrResponseBlocking> should_response_to_request_be_blocked_due_to_nosniff(Response const&, Request const&);
+
+}