= CORS (cross origin resource sharing) =
* https://www.tutorialspoint.com/spring_boot/spring_boot_cors_support.htm
Cross-Origin Resource Sharing (CORS) is a security concept that allows restricting the resources implemented in web browsers. It prevents the JavaScript code producing or consuming the requests against different origin.
* https://en.wikipedia.org/wiki/Cross-origin_resource_sharing
The CORS standard describes new HTTP headers which provide browsers a way to request remote URLs only when they have permission
== Headers ==
* https://en.wikipedia.org/wiki/Cross-origin_resource_sharing#Headers
Response headers
* Access-Control-Allow-Origin
* Access-Control-Allow-Credential
== PHP example ==
=== read.example.org/index.php ===
{{{#!highlight php
}}}
=== auth.example.org/index.php ===
{{{#!highlight php
}}}
=== app.example.org/index.html ===
{{{#!highlight html
}}}
=== Apache vhosts configuration ===
{{{
ServerName app.example.org
DocumentRoot "/var/www/htdocs/app.example.org"
Require local
AllowOverride All
ServerName auth.example.org
DocumentRoot "/var/www/htdocs/auth.example.org"
Require local
AllowOverride All
ServerName read.example.org
DocumentRoot "/var/www/htdocs/read.example.org"
Require local
AllowOverride All
}}}