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https://issues.apache.org/jira/browse/HTTPCLIENT-1272?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daz DeBoer updated HTTPCLIENT-1272:
-----------------------------------

    Description: 
Similar to HTTPCLIENT-1107, but for Proxy authentication. It appears that 
subsequent authentication schemes are not attempted if an earlier scheme fails.

In our case, a proxy supports both NTLM and BASIC authentication. When NTML 
authentication fails due to the wrong credentials being supplied, BASIC 
authentication is never attempted against the proxy.

I am a Gradle core developer, and we use HttpClient internally for dependency 
resolution. This issue was reported by one of our users.

  was:
Similar to HTTPCLIENT-1107, but for Proxy authentication. It appears that 
subsequent authentication schemes are not attempted if an earlier scheme fails.

In our case, a proxy supports both NTLM and BASIC authentication. When NTML 
authentication fails due to the wrong credentials being supplied, BASIC 
authentication is never attempted against the proxy.

    
> HttpClient does not retry failed PROXY authentication when multiple 
> challenges are present
> ------------------------------------------------------------------------------------------
>
>                 Key: HTTPCLIENT-1272
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1272
>             Project: HttpComponents HttpClient
>          Issue Type: Bug
>          Components: HttpClient
>    Affects Versions: 4.2.2
>            Reporter: Daz DeBoer
>
> Similar to HTTPCLIENT-1107, but for Proxy authentication. It appears that 
> subsequent authentication schemes are not attempted if an earlier scheme 
> fails.
> In our case, a proxy supports both NTLM and BASIC authentication. When NTML 
> authentication fails due to the wrong credentials being supplied, BASIC 
> authentication is never attempted against the proxy.
> I am a Gradle core developer, and we use HttpClient internally for dependency 
> resolution. This issue was reported by one of our users.

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