HSTS (HTTP Strict Transport Security) help to protect from protocol downgrade attack and cookie hijacking.
HSTS is a security policy which can be injected in response header by implementing in web servers, network devices, CDN.
HSTS policy instruct browser to load website content only through a secure connection (HTTPS) for defined duration.
As you can guess, your website must be accessible over HTTPS to take advantage of HSTS. You can refer this guide to implement HSTS in Apache, Nginx, Cloudflare.
Once implemented, you may use this tool verify the HSTS.
Secure Headers Test
Check if your site has secure headers to restrict browsers running from avoidable vulnerabilities
Check how quickly your server responds to the requests made by the browser
TCP Port Scanner
Quickly find out what ports are open on public Internet-facing IP or website
Check the supported protocol, server preferences, certificate details, common vulnerabilities and more
Broken Link Checker
Check if your web page contains internal or external broken links
Find out the hosting provider of any site, quickly
DNS Record Lookup
DNS lookup for A, TXT, MX, SPF and NS records
Website Performance Audit
Find out how does your site perform against more than 40 essential metrics
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