Security Headers Checker
Check a website's security headers like CSP, HSTS, X-Frame-Options and Referrer-Policy. Free security headers checker with fix suggestions.
About HTTP Headers Checker
The HTTP Headers Checker allows web scrapers, developers, and system administrators to inspect the exact response headers returned by any web server. By examining these headers, you can view critical connection details such as HTTP status codes, server signatures, cache directives, and content encoding.
Whether you are troubleshooting failed web scraping requests, debugging redirect chains, or auditing web application security settings, this tool provides instant visibility into server responses. It runs directly in your browser with no installation or account registration required.
Key features
- Inspect full HTTP response headers in real time
- Detect HTTP status codes and redirection paths
- Audit critical security headers including CSP and HSTS
- Examine cache-control and CDN routing directives
- Identify server configurations and content-type headers
- No registration or software download required
How to use HTTP Headers Checker
- Enter the full URL you want to inspect into the address field.
- Click the check button to initiate the HTTP request.
- Review the returned HTTP status code and response headers.
- Inspect specific headers for security, caching, or redirect details.
- Copy the raw or formatted header data for your records.
Who is it for?
- Web scrapers debugging blocked requests or bot-protection headers
- Developers verifying API responses and CORS configurations
- Security auditors validating HSTS, CSP, and X-Frame-Options headers
- SEO professionals checking 301 redirects and canonical link headers
- System administrators testing caching layers and CDN behaviors
Frequently asked questions
What are HTTP response headers?
HTTP response headers are key-value pairs sent by a web server alongside requested content. They provide technical metadata about the connection, such as content type, caching policies, security constraints, and server software.
Which security headers should I look for?
Key security headers include Content-Security-Policy (CSP), Strict-Transport-Security (HSTS), X-Content-Type-Options, X-Frame-Options, and Referrer-Policy. Verifying these helps protect your site against clickjacking and cross-site scripting attacks.
Can this tool follow HTTP redirects?
Yes, the tool displays the initial response code along with headers such as Location, allowing you to trace 301, 302, and 307 redirects to their final destination.
Why is checking headers useful for web scraping?
Web scrapers inspect response headers to understand rate-limiting thresholds, detect cloud proxy interventions like Cloudflare, and ensure the target server is returning the expected content encoding.
Is this HTTP headers checker free to use?
Yes, this browser-based tool is completely free to use with no account creation or subscription required.