<PackageReference Include="NETStandard.Library" Version="2.0.0" />

System.Net.HttpResponseHeader

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