simple_sitemap has a notion of the last modified time for each sitemap. It'd be handy if this value appeared as an HTTP header in the response for a sitemap. This can be useful for monitoring, debugging, validation, etc.
This is also related to ✨ Cached sitemap Fixed since if we're going to make sitemap responses cacheable, we'll want to know when each one was actually modified so that caching systems can know when to refresh, etc.
When crafting the response for a sitemap, include the last modified date as an HTTP header.
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Issue #3199996 by dww, gbyte, walkingdexter: Set the Last-Modified HTTP...
Automatically closed - issue fixed for 2 weeks with no activity.