Test on localhost

1. Run ./gradlew bootRun
2. Run curl -I localhost:8080
3. Working: The Last-Modified is 2023 and not 1980

Test with java 17 (bugged)

1. Edit build.grade, change project-id with the id of your app engine flexible project
2. Run ./gradlew appengineDeploy
3. Grab your deploy version URL in the console and change the next command
4. Run curl -I https://20231115t133951-dot-project-id.ue.r.appspot.com
5. Bug: The Last-Modified should be 2023 and not 1980

Test with java 8 (not bugged)

1. Edit app.yaml, comment runtime_config section with java 17 and uncomment the one with java 8
2. Edit build.grade, comment sourceCompatibility and targetCompatibility with java 17 and uncomment the ones with java 8
3. Run ./gradlew appengineDeploy
4. Grab your deploy version URL in the console and change the next command
5. Run curl -I https://20231115t135745-dot-project-id.ue.r.appspot.com
6. Working: The Last-Modified is 2023 and not 1980