php - how to specify cache validator for Google fonts -
gtmetrix result specify cache validator (92) - server high what's mean? following resources missing cache validator. resources not specify cache validator cannot refreshed efficiently. specify last-modified or etag header enable cache validation following resources: http://fonts.googleapis.com/css?family=lato%3a100%2c100italic%2c300%2c300italic%2cregular%2citalic%2c700%2c700italic%2c900%2c900italic&ver=4.6.1 http://fonts.googleapis.com/css?family=lato%3a100%2c300%2c400%2c600%2c700%2c900%7copen+sans%3a700%2c300%2c600%2c400%7craleway%3a900%7cplayfair+display%7c&ver=4.6.1 the check you've performed complaining there not being either last-modified or etag header on resources being served fonts.googleapis.com site. unfortunately there isn't can (i assume) not in charge of servers. if want rid of warning can fonts google servers , serve them own server. can setup caching headers way want. note though, not of issue. thing happens when these headers...