Fix RSS feed caching

The Tailscale blog’s RSS feed is currently responding to every request from scratch, without caching. While it is reporting a Last-Modified header, it isn’t honoring it: it sends the full 200 kilobyte feed every single time my newsreader checks it.

This is a lot of unnecessary traffic, so I’d like to see this fixed as soon as it can be. I recommend using ETags instead of Last-Modified, as well: they’re easier to work with, and less prone to bugs like this.

We’ll followup in Tailscale blog RSS feed cache is not working · Issue #4336 · tailscale/tailscale · GitHub

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