Redirect Cname from a non-account domain to my url

say my domain is mydomain.com. I have a website at app.mydomain.com.
I have a 3rd party using a cname to redirect calls to app.theirdomain.com to app.mydomain.com. I see the calls in my cloudflare logs for app.theirdomain.com. But how can I redirect the calls correctly to app.mydomain.com

Hi,

When we talk about CNAME records and redirects these are separate things with different objectives.

A CNAME record is responsible DNS resolution and helping find the IP address.
A redirect is a HTTP status code that allows you change one URL to another URL.

What is the behaviour you want to see for your third-party in their browser?

If they type

If they type https://app.theirdomain.com in their browser address bar, do you expect that to stay the hostname and see the content of your page?

Or alternatively:

If If they type https://app.theirdomain.com in their browser address bar, do you expect the address bar to change to https://app.mydomain.com/ ?

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This sounds like you are looking for Cloudflare for SaaS.

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