When you have a client interface's method declared like:

@GET
public InputStream get...(...) ;

Then org.jboss.resteasy.client.core.ClientInvoker.extractEntity(BaseClientResponse) releases the connection whithout checking for !InputStream.class.isInstance(returnType) like org.jboss.resteasy.client.core.BaseClientResponse.getEntity(Class<T2>, Type, Annotation[]) does.

Then when you try to read from the InputStream it throws an "stream closed" exception.