private boolean validStrCheck(String callHost, String invalidChar) {
        final int offset = callHost.indexOf(invalidChar);
        if (offset == -1) {
            return true;
        }
        return false;
    }
https://github.com/pinpoint-apm/pinpoint/issues/7659
collector/src/main/java/com/navercorp/pinpoint/collector/dao/hbase/ReactorNettyBugWorkaroundFilter.java