HSTS is HTTP Strict Transport Security, a mean to enforce using SSL even if the user access the site through HTTP and not HTTPS. Require a browser su
On install and activation the header is inserted into requests, but the setting page does allow one to set any attributes. Users can edit the PHP as a work around. Seems overkill to have a plugin for one security related header, would make sense to offer other headers affecting XSS and sniffing for example.
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