What are HTTP headers?

HTTP headers are metadata sent between the browser and server with each request. They contain information about status code, content type, caching, security and more. They are invisible to regular visitors but critical for how the website functions.

Which security headers are most important?

The most important are Strict-Transport-Security (HSTS) which forces HTTPS, Content-Security-Policy (CSP) which protects against XSS, X-Frame-Options which prevents clickjacking, and X-Content-Type-Options which prevents MIME sniffing.

Do headers affect SEO?

Yes, several headers directly affect SEO. Status codes (200, 301, 404) determine how Google treats pages. X-Robots-Tag can block indexing. Canonical headers prevent duplicate content. Cache headers affect crawl budget.

Can I check headers for competitor websites?

Yes, the tool can check headers for any publicly accessible URL. This is useful for comparing your server configuration with competitors and identifying improvements.

Toolsscout

Http Header Check

What it does

Retrieves and displays HTTP headers for a URL — status code, caching, security, content type and server info.

You do not know what your server actually sends to browsers and search engines — and wrong headers can destroy SEO, security and performance

HTTP headers are invisible to regular visitors but critical for how browsers, search engines and security systems treat your website. Wrong caching headers can show outdated content, missing security headers make the website vulnerable to attacks, and wrong status codes can cause Google to deindex pages. Most website owners have no idea what their servers send — and find out only when something gøs wrong.

Wrong caching headers show outdated content — visitors see old prices, outdated product images or removed pages because the browser caches too aggressively
Missing security headers make the website vulnerable — without X-Frame-Options, Content-Security-Policy and Strict-Transport-Security the website is open to clickjacking, XSS and man-in-the-middle attacks
Wrong status codes confuse Google — a page returning 200 instead of 301 for redirects, or 200 instead of 404 for deleted pages, creates indexing problems
Missing compression slows the website — without gzip or brotli compression files are 3-5x larger than necessary, which increases load time dramatically

Complete HTTP header analysis showing exactly what the server sends — with recommendations for SEO, security and performance

HTTP Header Check retrieves and analyzes all HTTP headers for a given URL and presents them in a clear format with color-coded recommendations. You see status code, caching settings, security headers, compression, content type and server information — with clear warnings for missing or misconfigured headers and concrete suggestions for improvement.

Complete header display: see all HTTP headers the server sends — status code, cache-control, content-type, security headers, server info and more — in a clear, color-coded format
Security check: the tool checks for critical security headers like HSTS, CSP, X-Frame-Options and X-Content-Type-Options — with warnings for missing headers
SEO analysis: checks status codes, canonical headers, robots directives and caching settings that affect how Google indexes and displays your pages
Performance check: verifies that compression (gzip/brotli) is enabled, that caching is configured correctly and that unnecessary headers are not slowing the response

Features

Status code analysis: shows the HTTP status code with explanation — 200 OK, 301 Redirect, 404 Not Found, 500 Server Error — and warns if the code is unexpected for the URL
Security header check: checks for HSTS, CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy and Permissions-Policy — with severity grading for missing headers
Cache analysis: shows cache-control, expires, etag and last-modified headers with explanation of what they mean and whether they are optimally configured for the content type
Redirect tracking: follows redirect chains and shows all steps from original URL to final destination — with warnings for unnecessary redirect hops

How it works

Enter the URL you want to check — the tool sends an HTTP request and retrieves all headers the server returns
See a complete overview of all headers with color-coded recommendations — green for OK, yellow for warnings, red for critical issues
Follow the concrete recommendations to fix missing security headers, optimize caching and correct wrong status codes

Use cases

Web developers debugging server configurations who need to see exactly which headers the server sends for specific URLs
SEO specialists checking if pages return correct status codes, canonical headers and robots directives for correct indexing
Security officers verifying that all necessary security headers are in place and correctly configured to protect against common attacks

Why use HTTP Header Check?

HTTP headers are the invisible infrastructure that determines how your website works for browsers, search engines and security systems. Wrong headers can lead to outdated content, security holes and SEO problems — without you noticing until the damage is done. HTTP Header Check makes this invisible infrastructure visible.

For SEO, headers are especially critical. A page returning 200 instead of 404 for deleted pages creates "soft 404" problems that confuse Google. Missing canonical headers can lead to duplicate content penalties. Wrong cache headers can cause Google to crawl outdated content.

Security headers are your first line of defense against common web attacks. Without HSTS users can be redirected to fake websites. Without CSP attackers can inject malicious code. HTTP Header Check checks all critical security headers and gives you a clear action plan.

FAQ

What are HTTP headers?: HTTP headers are metadata sent between the browser and server with each request. They contain information about status code, content type, caching, security and more. They are invisible to regular visitors but critical for how the website functions.
Which security headers are most important?: The most important are Strict-Transport-Security (HSTS) which forces HTTPS, Content-Security-Policy (CSP) which protects against XSS, X-Frame-Options which prevents clickjacking, and X-Content-Type-Options which prevents MIME sniffing.
Do headers affect SEO?: Yes, several headers directly affect SEO. Status codes (200, 301, 404) determine how Google treats pages. X-Robots-Tag can block indexing. Canonical headers prevent duplicate content. Cache headers affect crawl budget.
Can I check headers for competitor websites?: Yes, the tool can check headers for any publicly accessible URL. This is useful for comparing your server configuration with competitors and identifying improvements.

Try Http Header Check free