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Paste HTTP response headers to analyze security and caching directives.
HTTP Header Checker is a free online analyzer that lets you paste HTTP response headers to analyze security and caching directives. It runs entirely in your browser — no account creation, no software installation, and no data uploaded to external servers. This makes it a practical choice for anyone who needs to analyze and verify seo & marketing tools-related values quickly and privately. Whether you are a professional working through a daily task list, a student checking homework figures, or a freelancer preparing a deliverable, HTTP Header Checker gives you an instant result you can copy, screenshot, or feed into the next step of your workflow. ToolPeg hosts this tool alongside seo & marketing tools tools and 300+ other free utilities so you always have a single bookmark for everyday browser-based tasks.
Many ToolPeg tools process inputs locally, but tools that work with public URLs, domains, or network-facing information should still be treated as working with public-facing data.
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Client-Side Limitations
Browsers prevent client-side JavaScript from reading HTTP response headers of external URLs due to CORS restrictions. This tool provides an educational reference for common HTTP headers and lets you manually input headers for analysis.
Use browser DevTools (Network tab) or curl to retrieve headers, then paste them below.
Input headers manually to analyze them
Indicates the media type of the resource. Tells the browser how to interpret the response body.
Content-Type: text/html; charset=UTF-8SEO Impact: Ensures search engines correctly parse your page content. Wrong content type can prevent indexing.
Directives for caching mechanisms in both requests and responses.
Cache-Control: public, max-age=31536000SEO Impact: Proper caching improves page load speed, a key ranking factor. Affects Core Web Vitals.
Controls whether a browser should allow a page to be rendered in a frame, iframe, or object.
X-Frame-Options: SAMEORIGINSEO Impact: Prevents clickjacking attacks. Protects your content from being embedded on malicious sites.
Prevents the browser from MIME-sniffing a response away from the declared content type.
X-Content-Type-Options: nosniffSEO Impact: Security header that prevents content-type-based attacks. Signals a security-conscious site.
Forces browsers to only use HTTPS for the domain (HSTS).
Strict-Transport-Security: max-age=31536000; includeSubDomainsSEO Impact: HTTPS is a confirmed Google ranking signal. HSTS ensures all requests use secure connections.
Controls which resources the browser is allowed to load for the page.
Content-Security-Policy: default-src 'self'SEO Impact: Prevents XSS attacks and data injection. Enhances site trustworthiness for users and crawlers.
Provides crawling and indexing directives similar to meta robots, but at the HTTP header level.
X-Robots-Tag: index, followSEO Impact: Directly controls search engine indexing. Can block or allow page indexing for non-HTML resources.
Tells caches which request headers to consider when looking up a cached response.
Vary: Accept-EncodingSEO Impact: Important for serving different content to different user agents (e.g., mobile vs desktop).
An identifier for a specific version of a resource. Enables conditional requests.
ETag: "33a64df551425fcc55e4d42a148795d9f25f89d4"SEO Impact: Helps with efficient crawl budget usage. Crawlers can skip re-downloading unchanged content.
Specifies relationships between the current resource and others. Used for canonical URLs, pagination, and preloading.
Link: <https://example.com/page>; rel="canonical"SEO Impact: Can specify canonical URLs, hreflang, and preload hints at the HTTP level. Powerful for SEO.
Specifies which origins are allowed to access the resource via cross-origin requests.
Access-Control-Allow-Origin: *SEO Impact: Important for APIs and CDN-hosted resources. Affects third-party resource loading speed.
Specifies the compression algorithm used (gzip, br, deflate).
Content-Encoding: gzipSEO Impact: Compression reduces transfer size dramatically. Directly improves page speed and Core Web Vitals.