observatory.mozilla.org security analysis with A plus score implementation

observatory.mozilla.org site security analysis with A+ score implementation Content Security Policy: implement content security policy (CSP) header Cookies:All cookies shall use the Secure flag, session cookies use the HttpOnly flag, and cross-origin restrictions in place via the SameSite flag  Cross-origin Resource Sharing:Setup Content not visible via cross-origin resource sharing (CORS) files or headers  HTTP Strict Transport Security: Preloaded via the HTTP Strict Transport Security (HSTS) preloading process  Redirection: All hosts redirected to HTTP Strict Transport Security (HSTS) preload list for HTTPS Referrer Policy:Referrer-Policy header set to "no-referrer", "same-origin", "strict-origin" or "strict-origin-when-cross-origin"  Subresource Integrity: Subresource Integrity (SRI)  implementation X-Content-Type-Options:X-Content-Type-Options header set to "nosniff"  X-Frame-Options:X-Frame-Options (XFO) header set to SAMEORIGIN or DENY  X-XSS-Protection:Deprecated X-XSS-Protection header implementation

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