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Configure Apache To Accept Cross-Site XMLHttpRequests on Ubuntu

Update: check out this for more up-to-date instructions: http://enable-cors.org/server_apache.html

1. Make sure you have the mod_headers Apache module installed. to do this check out /etc/apache2/mods-enabled/ and see if there’s a ‘headers.load’ in there. If there isn’t then just sudo ln -s /etc/apache2/mods-available/headers.load /etc/apache2/mods-enabled/headers.load

2. Add the Access-Control-Allow-Origin header to all HTTP responses. You can do this by adding the line Header set Access-Control-Allow-Origin "*" to the desired <Directory> section in your configuration file (like the /etc/apache2/sites-available/default file). Saying "*" will allow cross-site XHR requests from anywhere. You can say "www.myothersite.com" to only accept requests from that origin.

3. Reload apache server. sudo /etc/init.d/apache2 reload

Maybe this is really obvious to a lot of people, but it wasn’t to me, so there you go.