No 'Access-Control-Allow-Origin' header is present on the requested resource

XMLHttpRequest cannot load http://some.domain/some.html. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'https://another.domain' is therefore not allowed access.

Add the following code to response of the some.domain server

Access-Control-Allow-Origin: *

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