}
                    curReq = next;
                }
                if ( !isDisconnected() && !curReq.isResponseAsync() && !curReq.getResponse().isAsync() && !curReq.getResponse().isError()
                        && grantedCredits == 0 ) {
                    if ( this.credits.availablePermits() > 0 || n > 0 ) {
                        log.debug("Server " + this + " returned zero credits for " + curReq);