@Override
    @Deprecated
    protected AbstractConnPool createConnectionPool(HttpParams params) {
         return new NamedConnectionPool(connOperator, params);
    }
A connection manager that uses {@link NamedConnectionPool}, which provides
connection reuse statistics, as its underlying connection pool.

@author awang
ribbon-httpclient/src/main/java/com/netflix/http4/MonitoredConnectionManager.java