code: public static String getAppidFromAuthHeader(String authorization) {
  		if (StringUtils.isBlank(authorization)) {
  			return "";
  		}
  		String appid = "";
  		// JWT token
  		if (StringUtils.startsWith(authorization, "Bearer")) {
  			try {
  				String[] parts = StringUtils.split(authorization, '.');
  				if (parts.length > 1) {
  					Map<String, Object> jwt = getJsonReader(Map.class).readValue(Utils.base64dec(parts[1]));
  					if (jwt != null && jwt.containsKey(Config._APPID)) {
  						appid = (String) jwt.get(Config._APPID);
  					}
  				}
  			} catch (Exception e) { }
  		} else if (StringUtils.startsWith(authorization, "Anonymous")) {
  			// Anonymous request - no signature or JWT
  			appid = StringUtils.substringAfter(authorization, "Anonymous").trim();
  		} else {
  			// Amazon Signature v4
  			appid = StringUtils.substringBetween(authorization, "=", "/");
  		}
  		if (StringUtils.isBlank(appid)) {
  			return "";
  		}
  		return App.id(appid).substring(4);
  	}
docs: Returns the app identifier by parsing the Authorization.
  @param authorization Authorization header
  @return appid