feat : add eTag response

src/main/java/usw/suwiki/domain/lecture/controller/LectureController.java

@@ -70,7 +70,8 @@ public ResponseEntity<ApiResponse<NoOffsetPaginationResponse<LectureWithOptional
     public ResponseEntity<LectureAndCountResponseForm> findAllLectureApi(
         @RequestParam(required = false) String option,
         @RequestParam(required = false) Integer page,
-        @RequestParam(required = false) String majorType) {
+        @RequestParam(required = false) String majorType
+    ) {
 
         LectureFindOption findOption = new LectureFindOption(option, page, majorType);
         LectureAndCountResponseForm response = lectureService.readAllLecture(findOption);
@@ -81,7 +82,8 @@ public ResponseEntity<LectureAndCountResponseForm> findAllLectureApi(
     @GetMapping
     public ResponseEntity<ResponseForm> findLectureByLectureId(
         @RequestParam Long lectureId,
-        @RequestHeader String Authorization) {
+        @RequestHeader String Authorization
+    ) {
 
         if (jwtAgent.getUserIsRestricted(Authorization)) {
             throw new AccountException(USER_RESTRICTED);

src/main/java/usw/suwiki/global/config/ETagConfig.java

@@ -0,0 +1,22 @@
+package usw.suwiki.global.config;
+
+import org.springframework.boot.web.servlet.FilterRegistrationBean;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.filter.ShallowEtagHeaderFilter;
+
+@Configuration
+public class ETagConfig {
+
+    @Bean
+    public ShallowEtagHeaderFilter shallowEtagHeaderFilter() {
+        FilterRegistrationBean<ShallowEtagHeaderFilter> filterFilterRegistrationBean = new FilterRegistrationBean<>(
+            new ShallowEtagHeaderFilter()
+        );
+
+        filterFilterRegistrationBean.addUrlPatterns("/lecture/all");
+        filterFilterRegistrationBean.setName("etagFilter");
+        return new ShallowEtagHeaderFilter();
+    }
+
+}