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https://issues.apache.org/jira/browse/HTTPCLIENT-1129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13122042#comment-13122042
 ] 

Oleg Kalnichevski commented on HTTPCLIENT-1129:
-----------------------------------------------

Well, there are authentication schemes in existence that authenticate 
connections, not requests, for instance, NTLM. Truth to be told, I know next to 
nothing about kerberos, but I always assumed kerberos was used to authenticate 
connections like NTLM, not individual requests.

Can you try the following bit of code and let me know if that makes any 
difference?

---
DefaultHttpClient httpclient = new DefaultHttpClient();

AuthSchemeFactory asf = new AuthSchemeFactory() {

    public AuthScheme newInstance(HttpParams params) {
        return new NegotiateScheme() {

            @Override
            public boolean isConnectionBased() {
                return false;
            }

        };
    }

};
httpclient.getAuthSchemes().register(AuthPolicy.SPNEGO, asf);
---

Oleg
                
> Redirect and Kerberos authentication in conflict
> ------------------------------------------------
>
>                 Key: HTTPCLIENT-1129
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1129
>             Project: HttpComponents HttpClient
>          Issue Type: Wish
>          Components: HttpClient
>    Affects Versions: 4.1.2
>            Reporter: Harald Kirsch
>         Attachments: examples.txt, logFrom401Example.txt, 
> this_also_works.log, this_works.log, wiresharkFrom401.txt
>
>
> We are using the HttpClient to connect to a Website that uses 
> Kerberos-Authentication.
> Beware this trigger word: Kerberos! I think this is *not* the problem, but 
> please read on.
> Here is the sequence of events:
> Client: GET /
> Server: Unauthorized.
> Client: GET / and includes authentication.
> Server: 302 to /something on the same host (this shows that in principle 
> authentication works)
> Client: GET /something,  does not include authentication
> Server: Unauthorized
> Client quits with 401-Unauthorized.
> I would have expected one of the following instead:
> 1) Client immediately sends authorization information with the redirected GET 
> /something
> 2) Client re-requests the /something with authorization after 
> 401-Unauthorized.
> We could get around the problem by setting the ConnectionReuseStrategy to a 
> constant false.
> It would be great if someone could tell me if HttpClient works as expected or 
> whether there is a bug or misconfiguration lurking.
> Thanks,
> Harald.

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