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Complete Error:
Refused to set unsafe header “Connection”
XMLHttpRequest cannot load http://www.yourdomain.com/index.php. Origin http://yourdomain.com is not allowed by Access-Control-Allow-Origin.
This seems to happen whenever you access your domain via the domain url without the www record. So the Ajax calls that are made when adding a product to the cart seem to make calls to the www.yourdomain.com url and sees it as a different website.
A simple workaround is to place the following in your .htaccess file
RewriteEngine on
RewriteCond %{http_host} ^yourdomain.com$ [nc]
RewriteRule ^(.*)$ http://www.yourdomain.com/$1 [r=301,nc]Also remember to replace yourdomain.com with your website domain name
