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java.net.UnknownHostException: 	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:195)	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)	at java.net.Socket.connect(Socket.java:529)	at org.apache.nutch.protocol.http.HttpResponse.(HttpResponse.java:97)	at org.apache.nutch.protocol.http.Http.getResponse(Http.java:64)	at org.apache.nutch.protocol.http.api.HttpBase.getProtocolOutput(HttpBase.java:225)	at org.apache.nutch.fetcher.Fetcher$FetcherThread.run(Fetcher.java:640)