Future Security Standards

Preparing for Upcoming Standards
class FutureSecurityHeaders {
    constructor() {
        this.experimentalHeaders = new Map();
    }
    
    // Add experimental headers with feature detection
    addExperimentalHeader(name, value, detector) {
        this.experimentalHeaders.set(name, { value, detector });
    }
    
    middleware() {
        return (req, res, next) => {
            // Apply experimental headers if supported
            for (const [name, config] of this.experimentalHeaders) {
                if (!config.detector || config.detector(req)) {
                    res.setHeader(name, config.value);
                }
            }
            
            // Future-proof security headers
            this.setFutureHeaders(res);
            
            next();
        };
    }
    
    setFutureHeaders(res) {
        // Proposed headers (may not be implemented yet)
        
        // JS Isolation
        res.setHeader('JS-Isolation', 'strict');
        
        // WebAssembly CSP
        res.setHeader('Content-Security-Policy-Wasm', 
            "wasm-src 'self' 'wasm-unsafe-eval'");
        
        // Client Hints security
        res.setHeader('Accept-CH', 'DPR, Width, Viewport-Width');
        res.setHeader('Accept-CH-Lifetime', '86400');
        
        // Future CORS enhancement
        res.setHeader('Access-Control-Allow-Private-Network', 'true');
        
        // Speculation Rules
        res.setHeader('Speculation-Rules', JSON.stringify({
            prefetch: [{
                source: 'list',
                urls: ['/next-page', '/popular-page']
            }]
        }));
    }
}

// Register experimental headers
const futureHeaders = new FutureSecurityHeaders();

futureHeaders.addExperimentalHeader(
    'Sec-Browsing-Topics',
    '()',
    (req) => req.headers['sec-fetch-dest'] === 'document'
);

futureHeaders.addExperimentalHeader(
    'Critical-CH',
    'DPR, Width',
    () => true
);