fix: MissingRequestHeaderException 해결을 위한 필터설정 상세추가

Author: rudalsss

build.gradle

@@ -23,19 +23,15 @@ ext {
 }
 
 dependencies {
-	// 보안
-	implementation 'org.springframework.boot:spring-boot-starter-security'
-
 	// Gateway (WebFlux 기반)
 	implementation 'org.springframework.cloud:spring-cloud-starter-gateway-server-webflux'
 
-	// 모니터링
+	// Actuator (헬스체크용)
 	implementation 'org.springframework.boot:spring-boot-starter-actuator'
 
 	// 테스트
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'
 	testImplementation 'io.projectreactor:reactor-test'
-	testImplementation 'org.springframework.security:spring-security-test'
 	testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
 
 	// jwt

src/main/java/com/financedoc/gateway_service/config/SecurityConfig.java

@@ -8,23 +8,37 @@ spring:
     gateway:
       server:
         webflux:
+          default-filters:
+            - PreserveHostHeader
           routes:
             - id: user-service
               uri: http://user-service-service.default.svc.cluster.local:80
               predicates:
                 - Path=/user/**
+              filters:
+                - RemoveRequestHeader=Cookie
+                - AddRequestHeader=X-User-Id, #{request.headers['X-User-Id']}
             - id: report-service
               uri: http://report-service-service.default.svc.cluster.local:80
               predicates:
                 - Path=/report/**
+              filters:
+                - RemoveRequestHeader=Cookie
+                - AddRequestHeader=X-User-Id, #{request.headers['X-User-Id']}
             - id: edu-service
               uri: http://edu-service-service.default.svc.cluster.local:80
               predicates:
                 - Path=/edu/**
+              filters:
+                - RemoveRequestHeader=Cookie
+                - AddRequestHeader=X-User-Id, #{request.headers['X-User-Id']}
             - id: recommend-service
               uri: http://recommend-service-service.default.svc.cluster.local:80
               predicates:
                 - Path=/recommend/**
+              filters:
+                - RemoveRequestHeader=Cookie
+                - AddRequestHeader=X-User-Id, #{request.headers['X-User-Id']}
 
 management:
   endpoints: