HTTP Header & Status Code Checker
Inspect HTTP response status codes (200 OK, 301 Redirect, 404, 500), response latency, web server headers, and conduct an automated security headers audit (HSTS, CSP, X-Frame-Options) for any website.
Why HTTP Headers & Status Codes Are Critical for SEO and Security
Every time a browser requests a page or a Googlebot crawls your URL, the web server returns HTTP response headers. Incorrect status codes (like silent 302 temporary redirects instead of permanent 301s) can destroy organic search rankings, while missing security headers leave visitors vulnerable to cyber threats.
HSTS (Strict-Transport-Security)
Forces browsers to only communicate over HTTPS, preventing SSL-stripping and man-in-the-middle downgrade attacks.
X-Frame-Options
Controls whether your site can be embedded inside <iframe> tags, stopping clickjacking attacks completely.
Content-Security-Policy (CSP)
Restricts sources from which scripts, styles, and assets can be loaded, shutting down cross-site scripting (XSS) vectors.
Frequently Asked Questions
What is the difference between a 301 and 302 redirect?
A 301 Moved Permanently tells search engines that the URL has relocated forever, passing 99% of SEO link authority to the destination. A 302 Found is temporary and does not transfer page authority.
Why does a site need X-Content-Type-Options: nosniff?
Without this header, older and malicious browsers attempt to "sniff" file types, executing dangerous user uploads (e.g. an image containing executable JavaScript) as active code. Setting nosniff mandates strict MIME checking.
What is the ideal HTTP server response time?
Google recommends an initial server response time (TTFB) of under 200 milliseconds. Response times above 600ms trigger Core Web Vitals warnings and can hurt search rankings.