HTTP Header Checker
Crawling at scale?
When you need to inspect thousands of URLs without getting blocked, route through Rainproxy. Clean residential IPs, real fingerprints, 98.7% success rate.
Inspect any URL like a browser would, without the browser
A real GET request, followed end-to-end through every redirect, with the security and caching headers broken out for you.
We send a real request
A server-side fetch hits your URL with browser-style headers, no CORS, no client-side limits.
Follow the redirect chain
Each 3xx hop is captured with its status, location and headers so you can debug loops and traps.
Audit the final response
Status, security headers, caching and the full header list. Laid out for fast SEO and infra review.
Security header audit
Instant verdict on HSTS, CSP, X-Frame-Options, Referrer-Policy and more. Flagged when missing.
Cache + CDN signals
Spot stale caches, missing Cache-Control directives and CDN debug headers in one glance.
SEO redirect debugging
Catch redirect chains, 302→301 issues and broken canonical hops before Google does.
What the header checker shows
This free Rainproxy tool fetches any URL and shows exactly what the server returns: the status code, every hop of the redirect chain, and the full set of response headers including security, caching and content headers. It is the quickest way to answer "what is this URL actually doing" during an SEO audit or a deployment check.
Status codes and redirect chains
The tool follows redirects and lists every hop, so you can see a 301 to http, then to www, then to https, then to a trailing slash. Chains like that waste crawl budget and leak link equity. Search engines treat 301 as permanent and pass ranking signals; 302 is temporary and is treated differently. Seeing the whole chain at once is usually enough to spot the misconfiguration.
Security headers worth having
Response headers control a large part of your browser-side security posture, and they are easy to miss because nothing visibly breaks when they are absent.
- Strict-Transport-Security: forces HTTPS on later visits
- Content-Security-Policy: limits which scripts and origins may load
- X-Content-Type-Options: stops MIME sniffing
- X-Frame-Options or frame-ancestors: blocks clickjacking
- Referrer-Policy and Permissions-Policy: limit what you leak to third parties
Caching and CDN headers
Cache-Control, ETag, Age and provider headers such as CF-Cache-Status tell you whether a response is being served from cache or regenerated on every hit. If a page you expect to be cached shows a miss on every request, that is a performance problem visible here before it ever shows up in your analytics.