RSS File improvement | ETag and Last-Modified

[Sehn]

I'd like to know if that could be possible to include 2 headers in your rss files : "ETag" and "Last-Modified"
https://fishbowl.pastiche.org/2002/10/21/http_conditional_get_for_rss_hackers
https://pythonhosted.org/feedparser/http-etag.html

Spoiler

https://discordapp.com/channels/403905762268545024/404025002568974347/735842621783801907