namespace System.Net { public enum HttpResponseHeader { AcceptRanges = 20, Age = 21, Allow = 10, CacheControl = 0, Connection = 1, ContentEncoding = 13, ContentLanguage = 14, ContentLength = 11, ContentLocation = 15, ContentMd5 = 16, ContentRange = 17, ContentType = 12, Date = 2, ETag = 22, Expires = 18, KeepAlive = 3, LastModified = 19, Location = 23, Pragma = 4, ProxyAuthenticate = 24, RetryAfter = 25, Server = 26, SetCookie = 27, Trailer = 5, TransferEncoding = 6, Upgrade = 7, Vary = 28, Via = 8, Warning = 9, WwwAuthenticate = 29 } }