Do you know most of the security vulnerabilities can be fixed by implementing necessary headers in the response header?

Test with:

• SecurityHeaders.com
• CSP Evaluator
• Content Security Policy (CSP) Validator
• Report URI

add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
add_header X-Frame-Options "SAMEORIGIN";
add_header X-Content-Type-Options nosniff;
add_header Content-Security-Policy "default-src 'self';";
add_header Referrer-Policy same-origin;
add_header Permissions-Policy "geolocation=(),midi=(),sync-xhr=(),microphone=(),camera=(),magnetometer=(),gyroscope=(),fullscreen=(self),payment=()";