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org.apache.http.client.ClientProtocolException: null	at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:186)	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:57)	at org.sonatype.nexus.plugins.rrb.MavenRepositoryReader.getContent(MavenRepositoryReader.java:231)	at org.sonatype.nexus.plugins.rrb.MavenRepositoryReader.extract(MavenRepositoryReader.java:101)	at org.sonatype.nexus.plugins.rrb.RemoteBrowserResource.get(RemoteBrowserResource.java:138)	at org.sonatype.plexus.rest.resource.RestletResource.represent(RestletResource.java:233)	at org.sonatype.nexus.rest.NexusRestletResource.represent(NexusRestletResource.java:39)	at org.restlet.resource.Resource.getRepresentation(Resource.java:302)	at org.restlet.resource.Resource.handleGet(Resource.java:464)	at org.restlet.Finder.handle(Finder.java:353)	at org.restlet.Filter.doHandle(Filter.java:150)	at org.restlet.Filter.handle(Filter.java:195)	at org.restlet.Router.handle(Router.java:504)	at org.restlet.Filter.doHandle(Filter.java:150)	at org.restlet.Filter.handle(Filter.java:195)