http maven-plugin REST 설계 가이드 응답코드 content-box 박스 모델 Virtual DOM jsx @ConfigurationProperties application.properties border-box REST API spring boot Box model status code keystore var @Autowired put scope Connector let padding 500 const RESTful margin HTTP method border session 박스 rest Post client Get cookie Box 컴포넌트 delete server jar DOM https Patch Web CSS Browser 404