diff --git a/Dockerfile b/Dockerfile
index ee0c9ed..3f863e3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -27,7 +27,7 @@ FROM eclipse-temurin:21-jre-jammy
 RUN useradd -m app
 USER app
 
-COPY --chown=app --from=build /usr/src/app/target/*.jar /usr/app/app.jar
+COPY --chown=app --from=build /usr/src/app/target/*.jar /usr/app/timezone.jar
 
 EXPOSE 8080
-CMD ["java", "-jar", "/usr/app/app.jar"]
+CMD ["java", "-jar", "/usr/app/timezone.jar"]
diff --git a/src/main/java/dev/mars3142/fhq/timezone_service/root/controller/web/RootController.java b/src/main/java/dev/mars3142/fhq/timezone_service/root/web/controller/RootController.java
similarity index 89%
rename from src/main/java/dev/mars3142/fhq/timezone_service/root/controller/web/RootController.java
rename to src/main/java/dev/mars3142/fhq/timezone_service/root/web/controller/RootController.java
index 8d40e11..48f3c1f 100644
--- a/src/main/java/dev/mars3142/fhq/timezone_service/root/controller/web/RootController.java
+++ b/src/main/java/dev/mars3142/fhq/timezone_service/root/web/controller/RootController.java
@@ -1,4 +1,4 @@
-package dev.mars3142.fhq.timezone_service.root.controller.web;
+package dev.mars3142.fhq.timezone_service.root.web.controller;
 
 import java.net.URI;
 import org.springframework.http.HttpStatus;
diff --git a/src/main/java/dev/mars3142/fhq/timezone_service/timezone/domain/model/request/TimeZoneRequest.java b/src/main/java/dev/mars3142/fhq/timezone_service/timezone/domain/model/request/TimeZoneRequest.java
deleted file mode 100644
index 8042ca8..0000000
--- a/src/main/java/dev/mars3142/fhq/timezone_service/timezone/domain/model/request/TimeZoneRequest.java
+++ /dev/null
@@ -1,5 +0,0 @@
-package dev.mars3142.fhq.timezone_service.timezone.domain.model.request;
-
-public record TimeZoneRequest(String timezone) {
-
-}
diff --git a/src/main/java/dev/mars3142/fhq/timezone_service/timezone/service/impl/TimeZoneServiceImpl.java b/src/main/java/dev/mars3142/fhq/timezone_service/timezone/service/impl/TimeZoneServiceImpl.java
index c6a18a2..e857fab 100644
--- a/src/main/java/dev/mars3142/fhq/timezone_service/timezone/service/impl/TimeZoneServiceImpl.java
+++ b/src/main/java/dev/mars3142/fhq/timezone_service/timezone/service/impl/TimeZoneServiceImpl.java
@@ -31,6 +31,7 @@ public class TimeZoneServiceImpl implements TimeZoneService {
   }
 
   @Override
+  @Cacheable(value = "externalIp", key = "{#ip}")
   public String getExternalIp(String ip) {
     var result = ip;
     if (ip.equals("127.0.0.1")) {