Custom domains and self hosting

[steep frigate]

I have a worker sitting on foo.bar.com and I want my customer to be able to self host it on their site bar.baz.com. Currently foo.bar is being served in a cross origin iframe and it's running into issues with the newish 3rd party cookie changes.

I've been googling in a circle because I'm absolutely not using the correct terms, and the are all so loaded! Is there a good guide to follow anywhere?

I think I need to get the client to update their CNAME - but with what values, and how it's generated - I'm really not sure!

Any help and pointers would be ace - thank you!

[deep cloak]

Hey, I think you're looking for https://developers.cloudflare.com/cloudflare-for-platforms/cloudflare-for-saas/domain-support/

The basic steps will be

• you setup a fallback origin
• you can prepare your site for processing requests to their domain
• you add their domain as a custom domain, I recommend using DNS validation so the CNAME is the only thing they need to do
• then they change their CNAME to your fallback origin and Cloudflare will handle traffic and even create a TLS certificate

Limits and prices are in the docs, the TLDR is that the Custom Hostnames tab in the dash will become your friend