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https://issues.apache.org/jira/browse/HTTPCLIENT-1970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16778180#comment-16778180
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Oleg Kalnichevski commented on HTTPCLIENT-1970:
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[~cistoc] This makes no sense of what so ever. Why do you want to stick an 
incorrectly initialized {{AuthScheme}} into {{AuthCache}}? Please do not do 
that. HttpClient is correct in returning 401.

Oleg

> HttpClient does not support (non preemptive) digest authentication 
> -------------------------------------------------------------------
>
>                 Key: HTTPCLIENT-1970
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1970
>             Project: HttpComponents HttpClient
>          Issue Type: Bug
>          Components: HttpClient (classic)
>    Affects Versions: 4.5.6
>            Reporter: Cisto Cyriac
>            Priority: Major
>
> In HttpClient 4.5.6 the preemptive digest authentication works, however 
> non-Preemptive digest authentication does not work.  We found this issue when 
> the HttpClient library was upgraded from 4.4.1 to 4.5.6.  
> As per  rfc2617  https://tools.ietf.org/html/rfc2617#section-3.2.1
> nonce  is a server-specified data string which should be uniquely generated 
> each time a 401 response is made.
> This issue can  be reproduced by commenting out the following two digest 
> authentication override parameters in the preemptive auth example in 
> https://hc.apache.org/httpcomponents-client-4.5.x/httpclient/examples/org/apache/http/examples/client/ClientPreemptiveDigestAuthentication.java
>  
> DigestScheme digestAuth = new DigestScheme();
> // Suppose we already know the realm name
> //digestAuth.overrideParamter("realm", "some realm");
> // Suppose we already know the expected nonce value
> //digestAuth.overrideParamter("nonce", "whatever");



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