Server Spy - HTTP Headers & Server Inspector

Server Spy gives you instant visibility into HTTP headers, security configuration, and server technology for any website you visit. ── HEADERS ── • View all HTTP response headers for the active tab • Filter headers by name or value with instant search • Copy individual header values with one click • Export full header payload as JSON or generate a cURL command ── SECURITY ANALYSIS ── • Automatic security grade (A+ to F) based on header configuration • Checks for critical headers: Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, Strict-Transport-Security, and more • Pass/warn/fail status for each security check with explanations • Score breakdown showing exactly what's missing ── SSL / TLS ── • HTTPS vs HTTP detection at a glance • Negotiated protocol (HTTP/1.1, HTTP/2, HTTP/3) • HSTS (Strict-Transport-Security) presence and configuration ── TECH DETECTION ── • Server identification (nginx, Apache, Cloudflare, etc.) • CDN detection • Compression method (gzip, br, deflate) • Caching configuration analysis • Framework hints from response headers ── KEY FEATURES ── ✓ Status code and response time at a glance ✓ Automatic capture on page load (or manual refresh) ✓ Copy JSON or cURL command for any response ✓ Dark and light themes ✓ Fully offline — nothing is sent anywhere ── PRIVACY ── Server Spy runs entirely in your browser. No data leaves your machine. No accounts. No analytics. No tracking. Ever. ─────────────────────────────────────── Server Spy covers quick inspections. Server Compass covers everything else. Need full server deploy like Vercel UX, monitoring, uptime tracking, and performance analytics? → https://servercompass.app/