Hello,
Wordpress can be configured to detect SSL offload by checking for the prescense of a HTTP header. If you use this approach, then wordpress should generate pages which use the appropriate protocol automatically. This will avoid you needing to rewrite the page body. The standard header to use for this is X-forwarded-proto, which can be injected by setting add_x_forwarded_proto == "yes" under vserver -> Protocol Settings (vTM 11.0) or vserver -> Connection Management (vTM <= 10.4). The wordpress support site details the wordpress changes required here:
https://wordpress.org/support/topic/wordpress-behind-a-reverse-proxyssl-endpoint-slightly-borked
Alternatively. If you want to do the response rewriting, then you could create a hash of the local hostnames that need to be rewritten and check for "http://<name>", so that you ignore links to non-local content. Or you could use a regex to ensure you only rewrite links to page furniture. but then hyperlinks ("<a href") would remain unchanged. a combination of the two might work:
$body = string.regexsub($body, "(<link[^>]*?href=\"http)://", "$1s://","g");
$body = string.regexsub($body, "(<(script|img)[^>]*?src=\"http)://", "$1s://","g");
$body = string.regexsub($body, "(<a [^>]*? href=\"http)(://www.mysite.com)\","$1s$2", "g");
Cheers,
Mark
