HTTP Status & Header Checker

Problem: You Need to Debug HTTP Responses

When a website redirects unexpectedly, security headers are missing, or an API returns the wrong status code, you need to inspect the actual HTTP response. Browser developer tools only work for your own requests, and AI chatbots cannot make real HTTP requests — they can only describe what headers generally look like.

How This Tool Solves It

• Real HTTP check via server proxy — No CORS, no browser limitations. We fetch the URL server-side and return every detail.
• Full redirect chain — See every hop from initial request to final destination with status codes.
• Security header audit — Automatically flags missing CSP, HSTS, X-Frame-Options, and other critical security headers.
• Response time measurement — Know exactly how fast the server responds.
• AI Cannot Do This — AI has no ability to connect to your server and read real-time HTTP headers.

What This Tool Checks

What are HTTP status codes?

HTTP status codes are three-digit numbers returned by a server in response to a request. 2xx means success (200 OK), 3xx means redirect (301 moved, 302 found, 304 not modified), 4xx means client error (403 forbidden, 404 not found), and 5xx means server error (500 internal, 502 bad gateway, 503 service unavailable).

Why should I check HTTP headers?

HTTP headers control everything from caching behavior to security. Missing security headers like Content-Security-Policy or Strict-Transport-Security can leave your site vulnerable to attacks. Incorrect cache headers can slow down your site. Wrong CORS headers can break API integrations.

What security headers are checked?

This tool checks for: Content-Security-Policy (CSP), Strict-Transport-Security (HSTS), X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy, and Cache-Control. Missing or misconfigured headers are flagged with specific recommendations.

Why does this tool use a server proxy?

Browser security (CORS) prevents JavaScript from reading HTTP response headers from external domains. Our Cloudflare Function proxy makes the request server-side and returns all headers without browser restrictions.

Can I check internal/local URLs?

No. The proxy only checks public internet URLs. The URL must be reachable from Cloudflare's edge network. Localhost, 127.0.0.1, and private IP ranges (10.x.x.x, 192.168.x.x, 172.16-31.x.x) are not accessible.

How is response time measured?

Response time is measured by the Cloudflare Function that proxies the request. It records the time from initiating the connection to receiving the complete response headers, excluding the response body download time.

Why AI Cannot Replace This Tool

AI chatbots (ChatGPT, Claude, Gemini) can explain HTTP concepts, but they cannot:

• Connect to your actual server and read real-time response headers
• Detect the actual HTTP status code your server is returning right now
• Follow a redirect chain to the final destination and report each hop
• Measure actual server response time
• Verify whether security headers are actually present and configured correctly

This tool does all of this by making real HTTP requests through our Cloudflare proxy.