CORS configuration of a REST PHP server so that it can be used by an angular application
This code is described in more details in the article here.
It details how to set up a local development configuration with two servers.
An angular application is ran by grunt on port 9000, while a web server is used as a REST service on port 80. The REST server uses PHP and Slim to communicate with a mysql database backend.
The article describes how to tune the CORS configuration to avoid Access-Control-Allow-Origin
and X-Requested-With error messages.