namespace System.Net { public enum HttpRequestHeader { Accept = 20, AcceptCharset = 21, AcceptEncoding = 22, AcceptLanguage = 23, Allow = 10, Authorization = 24, CacheControl = 0, Connection = 1, ContentEncoding = 13, ContentLanguage = 14, ContentLength = 11, ContentLocation = 15, ContentMd5 = 16, ContentRange = 17, ContentType = 12, Cookie = 25, Date = 2, Expect = 26, Expires = 18, From = 27, Host = 28, IfMatch = 29, IfModifiedSince = 30, IfNoneMatch = 31, IfRange = 32, IfUnmodifiedSince = 33, KeepAlive = 3, LastModified = 19, MaxForwards = 34, Pragma = 4, ProxyAuthorization = 35, Range = 37, Referer = 36, Te = 38, Trailer = 5, TransferEncoding = 6, Translate = 39, Upgrade = 7, UserAgent = 40, Via = 8, Warning = 9 } }