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See ScaleSMEs →The sites that took security seriously spent an afternoon locking these down. Here's what each lock protects — and what stays open when it's missing:
Forces every browser to connect to your site only over the locked connection — no exceptions. Without it, a hacker on the same wifi (cafe, hotel, airport) can silently switch your visitors to the unlocked version and read everything they type — passwords, emails, card numbers — as it travels to you. Sites that lock this down make that attack physically impossible. One line of configuration.
The most important lock: a whitelist of exactly which code is allowed to run on your site. Without it, if a hacker slips a script in anywhere — a form, a comment, an ad, a plugin — it runs with your site's full powers. It can steal visitor logins, redirect people to fake pages, or silently install malware. Sites with this header can be hit by an injection attempt and show visitors nothing but a blocked, harmless error.
Tells other websites: "you may not embed my site inside a hidden frame." Without it, a hacker can build a page that looks like a normal button or video with an invisible copy of YOUR site layered on top. Visitors click what they think is "Play" — and actually click "Delete account" or "Confirm payment" on your site, in the hacker's favor. That's clickjacking. Sites that set this header simply cannot be clickjacked.
Tells browsers: "never guess what a file is — if the server didn't label it, refuse it." Without it, a hacker can upload something that looks like an image but is really a script; the browser guesses "script" and runs it on your domain — the same damage as a successful hack. Sites that set this close that guessing game completely.
Controls what your site reveals about a visitor's journey when they click a link to another site. Without it, your page's full URL travels along to every site your visitors click through to. If your URLs contain order IDs, session tokens, or personal identifiers, they're handed to third parties and sit in their logs. Sites that set this send only the bare domain — their customers' journeys stay private.
An explicit off-switch for your visitors' device features: camera, microphone, location, and more. Without it, any script running on your page can request those features — and the browser may quietly allow it. A compromised script could turn on a camera or read a location without anyone realizing. Sites that set this are the ones whose visitors never get a surprise camera icon.
The legacy shield against reflected script-injection attacks [tricks that bounce malicious code off your page]. It's the weakest of the seven — modern browsers ignore it — but it's free, harmless, and blocks a class of attacks for visitors still on older browsers. Sites that set it protect even the visitors using outdated browsers.
None of these is a gimmick — each one is a real lock on a real door. The sites that spent the hour to install them are the ones that don't become a cautionary tale.