【asp.net C#】在HttpClient的DefaultRequestHeaders上設置Cookie Header

可參考：
http://stackoverflow.com/questions/12373738/how-do-i-set-a-cookie-on-httpclients-httprequestmessage/13287224#13287224

https://d-fens.ch/2016/12/27/howto-set-cookie-header-on-defaultrequestheaders-of-httpclient/

重點兩種

【預設：HttpClientHandler(UseCookies=true)】

HttpClient <--httpclienthandler ookiecontainer="" p="">
cookieContainer.Add(baseAddress, new Cookie("CookieName", "cookie_value"));

【HttpClient <--httpclienthandler p="">
若是：HttpClientHandler(UseCookies=false) 則是手動加入header

httpClient.DefaultRequestHeaders.Add("Cookie", "auth=ArbitrarySessionToken");