CORS on Apache

To add the CORS authorization to the header using Apache, simply add the following line inside either the <Directory>, <Location>, <Files> or <VirtualHost> sections of your server config (usually located in a *.conf file, such as httpd.conf or apache.conf), or within a .htaccess file:

<IfModule mod_headers.c>
  Header set Access-Control-Allow-Origin "*"
</IfModule>
    

To ensure that your changes are correct, it is strongly recommended that you use

apachectl -t

sudo service apache2 reload

apachectl -k graceful

Altering headers requires the use of mod_headers. Mod_headers is enabled by default in Apache, however, you may want to ensure it's enabled by run

a2enmod headers

Note: you can also use add rather than set, but be aware that add can add the header multiple times, so it's likely safer to use set.