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https://issues.apache.org/jira/browse/HTTPCLIENT-1309?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13566010#comment-13566010
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Ian Blavins commented on HTTPCLIENT-1309:
-----------------------------------------

G'day

It looks like it might be a mismatch between what I said the target is and what 
I put in the request. In your snippet of code try replacing:

   HttpHost target = new HttpHost("127.0.0.1", 8080)

with 

   HttpHost target = new HttpHost("127.0.0.1")

so that the target and request no longer agree.

                
> UnknownHostException if DefaultHttpClient asked to handle HttpRequest whose 
> host name includes a port
> -----------------------------------------------------------------------------------------------------
>
>                 Key: HTTPCLIENT-1309
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1309
>             Project: HttpComponents HttpClient
>          Issue Type: Bug
>          Components: HttpConn
>    Affects Versions: 4.2.3
>         Environment: Mac OS X 10.6.8  HttpClient 4.2.1 - field above won't 
> let me put in 4.2.1
>            Reporter: Ian Blavins
>            Priority: Minor
>
> If a DefaultHttpClient is passed, in its .execute(target, request, context) 
> method call, an HttpRequest whose host name field contains a port suffix (eg 
> 192.168.0.102:8080) then SystemDefaultDnsResolver will try to resolve the 
> host name plus port and gets an UnknownHostException: 
> java.net.UnknownHostException: 192.168.0.102:8080.
> There appears to be a work around and that is to download the source of 
> SystemDefaultDnsResolver, make the obvious change to remove any port and then 
> rebuild httpclient-4.2.1.jar. (There is probably an easier way to present the 
> revised SystemDefaultDnsResolver since its intended to be replaced by the 
> user developer but I haven't discovered it)

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