Security Headers

The HTTP headers are used to pass additional information between the clients and the server through the request and response header. All the headers are case-insensitive, headers fields are separated by colon, key-value pairs in clear-text string format. The end of the header section is denoted by an empty field header. Security headers are a subset of these and they are typically found in the response to a web request. The headers that the server responds with instruct the browser what security rules to enforce when it handles your website's content.