System.Net.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