private String getExceptionMsg(HttpRequest httpRequest, String exceptionStr) {
		String errMsg = new StringBuilder("HttpRequest:").append(httpRequest.toString()).append("\nException:")
				.append(exceptionStr).toString();
		LOG.error(errMsg);
		return errMsg;
	}
private String getExceptionMsg ( HttpRequest httpRequest , String exceptionStr ) { String errMsg = new StringBuilder ( "HttpRequest:" ) . append ( httpRequest . toString ( ) ) . append ( "\nException:" ) . append ( exceptionStr ) . toString ( ) ; LOG . error ( errMsg ) ; return errMsg ; }
获得异常发生时的返回信息