Apache Rewrite rules to redirect hostnames

apache-redirect.conf

<IfModule mod_rewrite.c>
    RewriteEngine On

    # Redirect to WWW all domain variants but wwww variant
    # Redirect all domains that include the keywords target-domain, redirect-domain1, redirect-domain2
    # Excluding www.target-domain.com, www.no-redirect-domain1.com and www.no-redirect-domain2.com
    # To www.target-domain.com
    RewriteCond %{HTTP_HOST} ^(?!www\.target-domain\.com|.*\.no-redirect-domain1\.com)(.*\.|)(target-domain|redirect-domain1|redirect-domain2)\..*$ [NC]   
    RewriteRule ^(.*)$  http://www.target-domain.com$1  [R=301,L]

    # Enforce HTTPS depending on an URL. Keeping the same path
    # Useful for protected areas of the site 
    RewriteCond %{HTTPS} off
    RewriteRule ^/path(|/.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]

    # Conditional redirect depending on a domain name
    <If "%{HTTP_HOST} == 'www.domain.com'">
        RedirectMatch ^/$ http://www.other_domain.com
        Redirect "/path" "http://www.other_domain.com"
    </If>
</IfModule>

How to test redirects:

1. Install httpie : https://github.com/jkbrzt/httpie (for macOS brew install httpie)
2. http --print=hb http://<apache_server_hostname>/<path> Host:<test_hostname> | egrep "^HTTP|^Location|<title>"