Question

I have several domains with the same subdomain, that may or not be accessed securely. I need to redirect every request that comes in from redirect.somesite.com to be redirected to a secure site. I need the original url, domain, and if the site was requested as secure or not.

http://redirect.site1.com/page?id=1

Redirects to

https://process.site4.com/page?id=3&domain=a.site1.com&secure=0

and

https://redirect.site2.com/page?id=2

Redirects to

https://process.site4.com/page?id=3&domain=a.site2.com&secure=1

and

http://redirect.site3.com/page?id=3

Redirects to

https://process.site4.com/page?id=3&domain=a.site3.com&secure=0

and

http://www.site3.com/page?id=3

Remains as

http://www.site3.com/page?id=3

Answer 1

I assume you want the id query strings to match in the redirect?

Try this in your .htaccess file in your document root (or in your server/vhost config, change the ^page$ regex to ^/page$):

RewriteEngine On

# check if secure= is already set, and set it either to 1 or 0
RewriteCond %{QUERY_STRING} !secure=
RewriteCond %{HTTPS} on
RewriteRule ^page$ /page?%{QUERY_STRING}&secure=1 [L]

RewriteCond %{QUERY_STRING} !secure=
RewriteCond %{HTTPS} off
RewriteRule ^page$ /page?%{QUERY_STRING}&secure=0 [L]

# check if the host starts with a "redirect." and match against the "/page" URI
RewriteCond %{HTTP_HOST} ^redirect\.(.+)$ [NC]
RewriteRule ^page$ https://process.site4.com/page?domain=a.%1 [QSA,R,L]

The QSA at the last rule ensures that the ‘secure=’ and the original ‘id=’ query string parameters get tacked onto the URL.