Which HTTP headers to use for subdomain embedding?
I was able to figure out that because Lightsail uses a Bitnami deployment of WordPress, Bitnami overrides the .htaccess file. Instead you have to update the /opt/bitnami/apache2/conf/httpd.conf file by adding the following content: <IfModule headers_module> <IfVersion >= 2.4.7 > Header always setifempty X-Frame-Options ALLOW-FROM https://*.example.com </IfVersion> <IfVersion < 2.4.7 > Header always merge X-Frame-Options ALLOW-FROM … Read more