HTTP Header Denetleyicisi

What is an HTTP Header Checker?

An HTTP Header Checker is an in-depth diagnostic tool that reads the hidden "handshake and agreement" codes (HTTP Headers) that occur between the server and the web browser (Chrome, Safari, Googlebot) seconds before a page loads. While your visitors only see the design and content, search engine bots make their actual decisions based on the rules they read in these invisible HTTP headers (X-Robots-Tag, Cache-Control, Strict-Transport-Security, etc.).

Critical HTTP Headers for SEO and Performance

• Status Code: Indicates whether the page is alive or not. (e.g., 200 OK, 404 Not Found, 500 Server Error).
• X-Robots-Tag: Sometimes you want to hide (noindex) PDF files or non-HTML documents from Google. Since meta tags cannot be placed inside them, the "X-Robots-Tag: noindex" command is given directly via the HTTP Header.
• Cache-Control & Expires: Gives the command to the user's browser, "Keep the images on this page in memory on your computer for 30 days, do not download them from me again". It's the main factor that skyrockets your PageSpeed score (LCP).
• Content-Type: States the format and character set of the file (e.g., text/html; charset=UTF-8). When configured incorrectly, foreign characters appear as question marks () on the site.

The Importance of Security Headers

Modern search engines reward sites that protect users from malicious software. Your server throwing out a "Strict-Transport-Security (HSTS)" header is a guarantee that the site can only be opened encrypted (HTTPS). Similarly, the "X-Frame-Options: SAMEORIGIN" header prevents your competitors from stealing your site inside an iFrame and performing Clickjacking.

How to Use It?

Paste the page URL you want to inspect into the box. Our system will immediately send a HEAD request to your server, bringing the pure server configuration output before you in a simple and understandable table without downloading unnecessary image and JS codes.

Frequently Asked Questions (FAQ)

Question: What is the difference between HTTP 403 Forbidden and 401 Unauthorized?
Answer: While a 401 error means "I don't know who you are, log in (Login)"; a 403 error means "I know who you are but you don't have authorization (Permission) to read this file or I've blocked you by IP".

Question: Should the X-Powered-By header be visible?
Answer: No, security experts recommend hiding headers like "X-Powered-By: PHP/8.1" on the server side. Because these headers reveal to hackers what infrastructure (Node.js, PHP, ASP.NET) and which version your site is running on, making it easier for them to hunt for vulnerabilities.