HSTS is HTTPS Strict Transport Security: a way for sites to elect to always use HTTPS. See http://dev.chromium.org/sts.

Add domain

Input a domain name to add it to the HSTS set:

Domain:
Include subdomains:
Public key fingerprints:

(public key fingerprints are comma separated and consist of the hash function followed by a foreslash and the base64 encoded fingerprint, for example sha1/Guzek9lMwR3KeIS8wwS9gBvVtIg=)

Delete domain

Input a domain name to delete it from the HSTS set (you cannot delete preloaded entries):

Domain:

Query domain

Input a domain name to query the current HSTS set:

Domain: