How to set headers on objects in R2 using rclone

How do you set a Cache-Control header on an object in R2 when you’re using rclone to upload?

I burned a lot of time figuring this out. There are a lot of options that look like they’ll do it, but here it is:

--header-upload='Cache-Control: max-age=604800,public,immutable'

That’s the flag you want to use with rclone copy to set a Cache-Control header with Cloudflare R2. Whew.

Reason: sure, you can set cache rules at like 5 levels of the Cloudflare stack - Cache Rules, etc. But it’s really hard to get the right caching behavior for static JavaScript bundles, which is:

• 404s aren’t cached
• Non-404s are cached heavily

This does it. Phew.