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https://issues.apache.org/jira/browse/HTTPCLIENT-1540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14096261#comment-14096261
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Ka-Lok Fung commented on HTTPCLIENT-1540:
-----------------------------------------

I'll submit a patch for this as soon as I get outbound approval from my company.

> Support delegated credentials (ISC_REQ_DELEGATE) via ClientWinAuth
> ------------------------------------------------------------------
>
>                 Key: HTTPCLIENT-1540
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1540
>             Project: HttpComponents HttpClient
>          Issue Type: Improvement
>          Components: HttpClient
>    Affects Versions: 4.4 Alpha1
>         Environment: Windows
>            Reporter: Ka-Lok Fung
>
> If you use this Wikipedia graphic as a reference, 
> http://en.wikipedia.org/wiki/Kerberos_(protocol)#mediaviewer/File:Kerberos.svg,
>  the current implementation in HttpClient 4.4alpha1 does the first (red) and 
> last (green) steps but it doesn't do the middle one (middle). By adding a 
> parameter, it won't skip out on the middle step (where the Windows LSA will 
> ask the Windows domain controller to generate a ticket-granting-ticket for 
> the requested service).
> In {{WindowsNegotiateScheme.getToken()}}, the change would be to update
> {{Sspi.ISC_REQ_CONNECTION}} to {{Sspi.ISC_REQ_CONNECTION | 
> Sspi.ISC_REQ_DELEGATE}}.



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