code: private String getErrorHttpResponseMsg(HttpRequest httpRequest, StatusLine responseStatus) {
  		StringBuilder sb = new StringBuilder("HttpRequest:").append(httpRequest.toString());
  		sb.append("\nHttpResponse:");
  		if (responseStatus.getProtocolVersion() != null) {
  			sb.append(" protocol:").append(responseStatus.getProtocolVersion().toString());
  		}
  		sb.append(", code:").append(responseStatus.getStatusCode());
  		if (responseStatus.getReasonPhrase() != null) {
  			sb.append(", reasonPhrase:").append(responseStatus.getReasonPhrase());
  		}
  
  		LOG.error(sb.toString());
  		return sb.toString();
  	}
docs: 打印HTTP返回码非200的时候的错误信息