<dependency>
    <groupId>eu.bitwalker</groupId>
    <artifactId>UserAgentUtils</artifactId>
    <version>1.21</version>
</dependency>

public static void main(String[] args) {
  // org.springframework.web.server.ServerWebExchange
  ServerHttpRequest request = exchange.getRequest();
  Map<String, String> headers = request.getHeaders().toSingleValueMap();
  UserAgent userAgent = UserAgent.parseUserAgentString(headers.get("User-Agent"));
  String browser = getBrowser(userAgent.getBrowser().name());
  String operatingSystem = getOperatingSystem(userAgent.getOperatingSystem().name());

  // com.netflix.zuul.context.RequestContext
  RequestContext ctx = RequestContext.getCurrentContext();
  HttpServletRequest req = ctx.getRequest();
  UserAgent userAgent = UserAgent.parseUserAgentString(req.getHeader("User-Agent"));

  Browser browser = UserAgent.parseUserAgentString(request.getHeader("User-Agent")).getBrowser();
  Version version = browser.getVersion(request.getHeader("User-Agent"));
}

private String getBrowser(String browser) {
  if (StrUtil.isNotEmpty(browser)) {
        if (browser.contains("CHROME")) {
            return "CHROME";
        } else if (browser.contains("FIREFOX")) {
            return "FIREFOX";
        } else if (browser.contains("SAFARI")) {
            return "SAFARI";
        } else if (browser.contains("EDGE")) {
            return "EDGE";
        }
    }
    return browser;
}

private String getOperatingSystem(String operatingSystem) {
    if (StrUtil.isNotEmpty(operatingSystem)) {
        if (operatingSystem.contains("MAC_OS_X")) {
            return "MAC_OS_X";
        } else if (operatingSystem.contains("ANDROID")) {
            return "ANDROID";
        }
    }
    return operatingSystem;
}