HTTP Headers Checker
View and analyze HTTP response headers
About the HTTP Headers Checker
Every web response carries HTTP headers that reveal how a site is configured — its caching rules, security protections, server software, and more. This HTTP Headers Checker fetches a URL's response headers and lays them out, grouped so you can quickly scan the security and caching directives.
Developers debugging cache behavior, SEOs checking for the right directives, and security reviewers auditing protections all use it to see what a server actually sends. It highlights the key security headers, lets you filter to just security or caching headers, and shows the response status.
To bypass the browser's cross-origin restrictions, it fetches the target URL through a public CORS proxy (allorigins.win), which means the URL you check is sent to that third-party service.
How to Use the HTTP Headers Checker
- Enter the URL whose headers you want to inspect.
- Click Check Headers.
- Use the All / Security / Caching / Other filters to focus on the headers you care about.
- Read each header's name and value — security headers are highlighted — and copy the set you need.
Why Use ToolForge’s HTTP Headers Checker
- It groups headers into security, caching, and other, and highlights the security ones, so an audit takes seconds rather than scrolling raw output.
- Filter tabs let you narrow to exactly the category you are checking.
- It works on any public URL from the browser by routing through a CORS proxy, with no backend of your own required.
- It is transparent that the target URL is sent to the allorigins.win proxy to retrieve the headers, since the browser cannot read them cross-origin directly.
Frequently Asked Questions
What are HTTP response headers?
They are metadata a server sends with each response, describing things like content type, caching policy, security rules, and the server software. They are not visible on the page itself but govern how browsers and crawlers treat it.
Why does this need a proxy to read headers?
Browser security blocks a page from reading the headers of a response from another origin. To work around that, the tool routes the request through a public CORS proxy, which fetches the URL and returns the headers — so the URL you enter is sent to that proxy service.
Which security headers should a site have?
Common ones include Content-Security-Policy, Strict-Transport-Security, X-Frame-Options, and X-Content-Type-Options. This tool highlights them so you can see at a glance which are present; a dedicated analyzer can grade how complete your coverage is.
