HTTP Header Checker

Enter any URL and instantly retrieve the full HTTP response headers returned by its web server. Diagnose redirect chains, verify security headers, confirm caching rules, and troubleshoot SEO issues, no sign-up, no charge, no limits.

What Is an HTTP Header Checker?

An HTTP Header Checker is a tool that retrieves and displays the HTTP response headers from a web server for a given URL. These headers contain important instructions about how a page is delivered, including its status code, caching rules, security settings, and content type.

By analyzing these headers, you can quickly identify SEO issues, redirect problems, missing security configurations, and performance bottlenecks. This makes it an essential tool for developers, SEO professionals, and website owners who want to ensure their site is properly configured and optimized.

H2: How to Use This Tool

Step 1: Enter Your URL

Paste any full URL into the input field above, including https://. You can check any webpage, product page, API endpoint, or even a competitor site using HasheTools.

Step 2: Click “Check Headers”

Click the button to send a request. HasheTools.com will fetch the exact HTTP response headers returned by the server, just like a browser or search engine crawler.

Step 3: View & Analyze Results

Within seconds, you’ll see all response headers grouped by type, including status codes, security headers, caching rules, and redirect information. Use these insights to detect SEO issues, performance gaps, and security misconfigurations.

What HTTP Response Headers Will You See?

Our tool retrieves and displays the most important HTTP response headers returned by a web server for any URL. These headers give insights into how a website behaves in terms of SEO, security, performance, and redirects.

Below are the key headers you may see and what they indicate:

HTTP Status Code

The status code shows whether a request was successful, redirected, or failed. It is one of the most important signals for search engines to understand page availability and indexing status.

Content-Type

Defines the type of content being delivered (HTML, JSON, image, PDF, etc.) along with character encoding. It helps browsers and search engines correctly interpret the response.

Cache-Control

Controls how long a response can be cached and under what conditions. Proper caching improves loading speed, reduces server load, and directly supports better Core Web Vitals performance.

Common directives:

• public: The response can be cached by browsers AND CDNs
• private: Only the user's browser can cache this (not CDNs)
• max-age=86400: Cache for 86,400 seconds (24 hours)
• no-cache: Must revalidate with the server before using a cached copy
• no-store: Never cache this response (typically used for sensitive pages)
• stale-while-revalidate: Serve stale content while fetching a fresh copy in the background
• immutable: Content will never change; skip revalidation entirely (use with hashed filenames)

Content-Encoding

Indicates whether the response is compressed (e.g., gzip or Brotli). Compression reduces file size, improves load speed, and enhances overall performance.

Strict-Transport-Security (HSTS)

Forces browsers to always use HTTPS instead of HTTP. This improves security, prevents downgrade attacks, and strengthens user trust.

Content-Security-Policy (CSP)

Defines which resources (scripts, styles, images) are allowed to load on a page. It helps prevent cross-site scripting (XSS) attacks and protects site integrity.

X-Frame-Options

Provides indexing instructions for search engines at the HTTP level. It is especially useful for non-HTML files like PDFs, images, or API responses.

X-Content-Type-Options

What it is: A one-line security header that stops browsers from trying to guess (sniff) the MIME type of a response if it doesn't match the declared Content-Type.

Referrer-Policy

Controls how much referrer information is shared when users navigate from your site to another. This helps improve privacy and data control.

Content-Encoding

Indicates whether the response is compressed (e.g., gzip or Brotli). Compression reduces file size, improves load speed, and enhances overall performance.

Location (Redirect Header)

Used in redirect responses (301/302) to indicate the next URL. It helps identify redirect chains that can impact SEO and page speed.

X-Robots-Tag

Provides indexing instructions for search engines at the HTTP level. It is especially useful for non-HTML files like PDFs, images, or API responses