f0a6128db3
Prior to this commit, packaging a Spring Boot application as a container image with Cloud Native Buildpacks could result in unwanted browser caching behavior, with "Last-Modified" HTTP response headers pointing to dates in the far past. This is due to CNB resetting the last-modified date metadata for static files (for build reproducibility and container layer caching) and Spring static resource handling relying on that information when serving static resources. This commit introduces a new configuration property `spring.web.resources.cache.use-last-modified` that can be used to disable this behavior in Spring if the application is meant to run as a container image built by CNB. The default value for this property remains `true` since this remains the default value in Spring Framework and using that information in other deployment models is a perfectly valid use case. Fixes gh-24099 |
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