Always ask about Cors

[SteveStrong]

I have found that only about 30% of the people I ask about Cors, know what it is. I use this question to discover if they understand the issues in building a rich client that is served from a container or CDN and connects to services on another server. I believe that anyone who is building modern web-based clients has encountered cors in their day to day job. How about you?

https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS

[knitcodemonkey]

I have run into it, but I've found that the most common reason to have experienced issues with cross-origin resources is by sharing resources across (sub)domains. Many websites are hosted on a single domain, thus running into this situation less often. I can see how a CDN could increase that potential, but not everyone uses those, either. I'd be happy to add a question if you are interested in creating a PR for one.