HTTP Conditional Request
[HTTP If-Modified-Since](https://texonom.com/http-if-modified-since-1f2eb357361145b68f1efc5fb8484c6c) [HTTP If-Modified-Since](https://texonom.com/http-if-modified-since-1f2eb357361145b68f1efc5fb8484c6c) 





> [HTTP 조건부 요청 - HTTP | MDN](https://developer.mozilla.org/ko/docs/Web/HTTP/Conditional_requests)

> [웹 서비스 캐시 똑똑하게 다루기](https://toss.tech/article/smart-web-service-cache)






