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https://issues.apache.org/jira/browse/HTTPCLIENT-1452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13881029#comment-13881029
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Oleg Kalnichevski commented on HTTPCLIENT-1452:
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Lars,

Could you please attach a wirelog of the session (can be truncated but still 
containing several redirected loops)?

Oleg

> in case of a redirect a wrong host param is set to http header
> --------------------------------------------------------------
>
>                 Key: HTTPCLIENT-1452
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1452
>             Project: HttpComponents HttpClient
>          Issue Type: Bug
>          Components: HttpClient
>    Affects Versions: 4.3.1
>            Reporter: Lars Bachmann
>
> The following url will lead to a circular redirect and a 
> CircularRedirectException in the end:
> http://it.bing.com/
> The reason is that http://it.bing.com will redirect to http://www.bing.com 
> but the header param "host" is not set to the new host (bing.com), instead 
> the host param of the original request (it.bing.com) is used. In the end the 
> redirect request will not call http://www.bing.com but http://it.bing.com 
> instead, which is the same location like the original url and will end up in 
> a circular deadlock.
> The fix would be to override the host param with the value of the redirect 
> request after copying all header params from the original request to the 
> redirect request.
> The class to adjust is: 
> org.apache.http.impl.client.DefaultRequestDirector.java
> The problem is also addressed here:
> http://stackoverflow.com/questions/6698214/avoid-circular-redirect-using-httpclient-4-1-1



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