HTTP security headers are a security measure that allows your website’s server to prevent some common security threats before it affects your website. Basically, when a user visits your website, your web server sends an HTTP header response back to their browser. This response tells browsers about error codes, cache control, and other statuses.

The normal header response issues a status called HTTP 200. After which your website loads in the user’s browser. However, if your website is having difficulty then your web server may send a different HTTP header.

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