question: public static boolean isExpired ( MultiMap headers , Long timestamp ) { if ( headers != null && timestamp != null ) { Integer queueExpireAfter = getQueueExpireAfter ( headers ) ; Integer expireAfter = getExpireAfter ( headers ) ; if ( queueExpireAfter != null ) { expireAfter = queueExpireAfter ; } if ( expireAfter != null ) { long expiredSince = System . currentTimeMillis ( ) - ( timestamp + expireAfter * 1000L ) ; if ( expiredSince > 0 ) { log . debug ( " > isExpired - Request expired since {} milliseconds." , expiredSince ) ; return true ; } else { log . debug ( " > isExpired - Request not expired (would expire in {} milliseconds)." , - expiredSince ) ; return false ; } } } return false ; }
target:  Checks the expiration based on the given headers and a timstamp in milliseconds.