httpservices/src/main/java/ucar/httpservices/HTTPSession.java
public HTTPSession setUseSessions(boolean tf)
    {
        localsettings.put(Prop.USESESSIONS, (Boolean) tf);
        this.cachevalid = false;
        return this;
    }
public HTTPSession setUseSessions(boolean tf)
    {
        localsettings.put(Prop.USESESSIONS, (Boolean) tf);
        this.cachevalid = false;
        return this;
    }
Should we use sessionid's?

@param tf