SaaS that allows customers to use their own domain (with a CNAME) and serves using a CDN [closed]

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http://serverfault.com – I created a SaaS where customers can link to URLs of the form: http://api.myservice.com/CUSTOMER_API_KEY/options/here My customers can put these URLs directly in their HTML. I allow them to have CNAMEd domains to api.myservice.com. For example, if they setup customer.domain.com as a CNAME to api.myservice.com and they fill it in my dashboard, the customer can use links like: http://customer.domain.com/options/here So far so good, but now I want to be able to serve these URLs from a CDN. I need a CDN that allows me to keep the path of my URLs exactly as they are now and allows me to add pro (HowTos)