HTTP Header Viewer server-side
?
How to use HTTP Header Viewer

The HTTP header viewer fetches and displays the response headers returned by a URL. Enter an address and the tool queries the target server to show you the status code, content type, caching headers, security headers, and any redirects. It is valuable for diagnosing a caching issue, checking that security headers are present, or understanding a redirect chain. Unlike tools that run in the browser, this request goes out from our server, which sidesteps CORS restrictions and lets you query any public URL

The HTTP header viewer fetches and displays the response headers returned by a URL

HTTPHeadersDev

How to use HTTP Header Viewer

The HTTP header viewer fetches and displays the response headers returned by a URL. Enter an address and the tool queries the target server to show you the status code, content type, caching headers, security headers, and any redirects. It is valuable for diagnosing a caching issue, checking that security headers are present, or understanding a redirect chain. Unlike tools that run in the browser, this request goes out from our server, which sidesteps CORS restrictions and lets you query any public URL

Frequently asked questions

Why does the request go from the server and not the browser?

A browser blocks reading headers from other domains because of CORS rules. By querying from our server, the tool bypasses that limit and can read headers from any public URL

Which headers are shown?

The tool shows the full set of response headers returned by the target server, including the status code, Content-Type, Cache-Control, security headers, and any redirects

Can I inspect a private or protected page?

The tool can only query publicly reachable URLs without authentication. A password protected page will return the matching error code

Is the URL I enter stored?

The URL is used only to perform the request and is not stored long term. Only the target server sees that the request comes from our infrastructure