Get HTTP Headers

What the Get HTTP Headers Tool Does

Before a server sends a web page, it sends a block of information called HTTP headers. They describe the response: its status, content type, caching rules, security settings and much more. Visitors never see them, but developers and SEO specialists depend on them. The Get HTTP Headers tool on WebTOOLkt fetches the headers for any URL and displays them in a readable list.

It is useful for troubleshooting redirects, checking caching, reviewing security settings and confirming that a server returns what you expect.

How to Use the Get HTTP Headers Tool

1. Enter the full URL, including http:// or https://.
2. Run the request.
3. Read the status line first, which shows the status code.
4. Scan the headers below it and compare them with what you expect.
5. Copy anything relevant into a ticket, an email or your notes.

Important Headers and What They Do

Headers are documented in the MDN HTTP headers reference. The ones you will check most often are:

• Content-Type. The kind of file returned and its character set.
• Cache-Control, Expires and ETag. How long browsers and CDNs may store a response.
• Location. Where a redirect leads.
• Server. The software the server announces. Some hosts hide this.
• Content-Encoding. Whether compression such as gzip or brotli is used.
• Set-Cookie. Cookies the server tries to set, with their flags.
• Last-Modified. When the content last changed.
• X-Robots-Tag. Indexing instructions for search engines, which can apply to files that have no HTML head. Google describes it in its robots meta tag specifications.

Security Headers to Look For

• Strict-Transport-Security. Tells browsers to use https only.
• Content-Security-Policy. Limits where scripts, images and other resources may load from, reducing the risk of injected code.
• X-Content-Type-Options. Stops browsers guessing file types.
• X-Frame-Options or frame-ancestors. Controls whether the page can be framed by other sites.
• Referrer-Policy. Decides how much referrer information is sent.
• Permissions-Policy. Limits access to browser features such as the camera.

The OWASP project maintains guidance in its Secure Headers Project. A missing header is not always a vulnerability, but it is a prompt to review your setup.

Using Headers for SEO and Performance

1. Confirm the status code. A page must return 200 to be indexed normally.
2. Check redirects. A Location header reveals where a redirect leads.
3. Review caching. Static files such as images, scripts and styles should have long cache times, while frequently changing pages need shorter ones.
4. Verify compression. Text responses should be compressed to cut transfer size.
5. Look for X-Robots-Tag. A stray noindex here can keep a file or page out of search without any visible clue.
6. Check canonical hints. Some servers send canonical information through a Link header.

Troubleshooting With Headers

• Page shows old content. Look at cache headers on both the origin and any CDN.
• Download starts instead of display. Check Content-Type and Content-Disposition.
• Garbled characters. Compare the declared charset with the real encoding of the page.
• Login keeps failing. Inspect Set-Cookie flags such as Secure and SameSite.
• Different results by region. Headers from a CDN may reveal which edge server answered.

For the underlying definitions, see RFC 9110, HTTP Semantics.

Why Use This Tool Instead of Other Options

Browser developer tools show headers too, but only for requests your own browser makes and only after you know where to look. The Get HTTP Headers tool lets you check any public URL quickly from outside your network, free and without setup. It works with the HTTP Status Code Checker, Redirect Checker and Server Status Checker on WebTOOLkt for a complete view of how a server responds.

Related WebTOOLkt Tools

• HTTP Status Code Checker to see the status code at a glance.
• Redirect Checker to follow every hop of a redirect.
• Server Status Checker to test whether a server is up.
• Page Size Checker to measure how heavy a page is.
• What Is My User Agent to see the user agent your browser sends.
• Hosting Checker to identify the host behind a site.

Useful External Resources

• MDN: HTTP headers
• OWASP Secure Headers Project
• RFC 9110: HTTP Semantics

Frequently Asked Questions

Why are some headers missing?

Servers send only the headers they are configured to send, and proxies or CDNs may add or remove some.

Can headers affect SEO?

Yes. Status codes, redirects, caching and X-Robots-Tag all influence how pages are crawled and indexed.

Are headers private?

No. Response headers are sent to every visitor and are not secret.

Syed M

Creator/Developer

Enjoy the little things in life. For one day, you may look back and realize they were the big things. Many of life's failures are people who did not realize how close they were to success when they gave up.