// Implementing Content Security Policy (CSP) to mitigate XSS attacks

const csp = "default-src 'self'; script-src 'self' https://cdnjs.cloudflare.com; style-src 'self' https://fonts.googleapis.com; font-src 'self' https://fonts.gstatic.com";

document.setHeader("Content-Security-Policy", csp);

// Implementing HTTP Strict Transport Security (HSTS) to enforce secure connections

const maxAgeInSeconds = 31536000; // 1 year

document.setHeader("Strict-Transport-Security", `max-age=${maxAgeInSeconds}; includeSubDomains`);

// Enabling Cross-Origin Resource Sharing (CORS) to allow secure communication between different origins

const allowOrigin = "https://example.com";

document.setHeader("Access-Control-Allow-Origin", allowOrigin);

// Implementing Subresource Integrity (SRI) to ensure that resources (e.g., scripts) are delivered without unexpected manipulation

const scriptIntegrity = "sha256-abcdef123456...";

const scriptSrc = "https://cdnjs.cloudflare.com/ajax/libs/library.min.js";

const scriptTag = `<script src="${scriptSrc}" integrity="${scriptIntegrity}" crossorigin="anonymous"></script>`;

document.write(scriptTag);

// Optimizing website performance by minimizing HTTP requests

// Combine multiple CSS/JS files into a single file

// Use asynchronous loading for non-blocking rendering

// Implement lazy loading for images and resources

// Implementing server-side caching to reduce server load and improve response times

// Use caching mechanisms like Redis or Memcached

// Set appropriate cache control headers (e.g., Cache-Control, Expires)

// Enabling gzip compression to reduce file sizes and improve page load times

// Configure web server (e.g., Apache, Nginx) to compress responses

// Implementing server-side security measures such as input validation, output encoding, and parameterized queries to prevent SQL injection and other vulnerabilities

// Regularly update and patch software to fix security vulnerabilities

// Implement security headers like X-XSS-Protection, X-Content-Type-Options, X-Frame-Options

// Implementing rate limiting and throttling to mitigate DoS and DDoS attacks

// Monitor traffic patterns and implement strategies to detect and mitigate attacks

// Implementing DNS security measures such as DNSSEC to prevent DNS spoofing and cache poisoning attacks

// Use reputable DNS providers and regularly audit DNS configurations

// Regularly audit website codebase for security vulnerabilities using automated tools and manual code reviews

// Implement a bug bounty program to incentivize security researchers to report vulnerabilities