https://learn.microsoft.com/ru-ru/dotnet/api/system.net.cache.httprequestcachelevel?view=netframework-4.8.1&viewFallbackFrom=net-10.0
HttpRequestCacheLevel Enum (System.Net.Cache) | Microsoft Learn
Specifies caching behavior for resources obtained using the Hypertext Transfer protocol (HTTP).
enumsystemcachemicrosoftlearn