IssueTracker

Problem you have encountered:

When using app engine flexible with spring boot and java 17 or java 11, all static files are returning  Last-Modified: Tue, 01 Jan 1980 00:00:01 GMT instead of the actual file modified date.

What you expected to happen:

App engine to return the correct Last-Modified of my file.

Steps to reproduce:

Clone this project: https://github.com/ivorcosta/flexible-last-modified

Follow the README. Test on localhost, test with app engine flexible java 17 and java 8.

Output of bugged curl -I <your-project-url>:

HTTP/1.1 200
Date: Wed, 15 Nov 2023 17:13:48 GMT
Content-Type: text/html;charset=UTF-8
Content-Length: 11
Vary: Origin
Vary: Access-Control-Request-Method
Vary: Access-Control-Request-Headers
Last-Modified: Tue, 01 Jan 1980 00:00:01 GMT
Accept-Ranges: bytes
Content-Language: en-US
Via: 1.1 google
Alt-Svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000

Other information (workarounds you have tried, documentation consulted, etc):

The current workaround is to use java 8