HSTS preload

What is HSTS preload?

HTTP Strict Transport Security (HSTS) is a web security policy mechanism that helps protect websites against attacks by ensuring that browsers only interact with the site using HTTPS. When a website implements HSTS, it instructs the browser to automatically convert any HTTP requests to HTTPS, thereby preventing insecure connections. However, for HSTS to be effective from the very first visit, the site needs to be included in the HSTS Preload list. The HSTS Preload list is a list of domains that are hardcoded into browsers to enforce HTTPS connections from the outset. This list is maintained by major browser vendors like Google, Mozilla, and Microsoft. By being included in this list, a domain ensures that users are always connected securely, even if they have never visited the site before. This is particularly important for new or infrequently visited sites, as it eliminates the window of vulnerability that exists before the browser can receive and enforce the HSTS policy. To get a domain included in the HSTS Preload list, several stringent requirements must be met. These include having a valid SSL certificate, serving all subdomains over HTTPS, and setting the HSTS header with the 'includeSubDomains' and 'preload' directives. Additionally, the HSTS policy must be set with a max-age of at least one year. Once these conditions are satisfied, the domain owner can submit their domain to the HSTS Preload list through the submission form provided by Google. HSTS Preload enhances the security and trustworthiness of the websites they manage, which is a critical factor in today's digital landscape. Moreover, being on the HSTS Preload list can improve a site's SEO ranking. Search engines like Google prioritize secure websites, and having a domain included in the HSTS Preload list signals to search engines that the site is committed to maintaining high security standards. This can lead to higher search engine rankings, increased visibility, and more traffic.