What is the best technique for SEO-friendly forwarding multiple domains to one web server?

@cameron_walter 

There are several techniques to forward multiple domains to a single web server in a way that is friendly to search engines:

1. Domain forwarding with a 301 redirect: This involves redirecting all domains to the primary domain using a 301 redirect, which informs search engines that the redirect is permanent.
2. Use of rel="canonical": This involves adding a rel="canonical" link in the HTML header of each page, indicating which page should be considered the preferred version.
3. Use of rel="alternate" hreflang: This involves adding a rel="alternate" hreflang tag to indicate to search engines the language and regional variations of a page.

Regardless of the technique used, it is important to ensure that the forwarding process does not cause any technical SEO issues, such as broken links, duplicate content, or incorrect use of redirects. Additionally, it is recommended to configure web analytics and tracking correctly to accurately track traffic and conversion data for all domains.