HTTP Cross Origin and Access Control Client: sending a cross-origin resource sharing (CORS) request
Example
A cross-origin request must be sent including the Origin header. This indicates from where the request originated. For example, a cross-origin request from http://example.com to http://example.org would look like this:
GET /cors HTTP/1.1
Host: example.org
Origin: example.com
The server will use this value to determine if the request is authorized.
