About the HTTP Header Checker Tool

This free tool helps you view and analyze HTTP headers from any website. HTTP headers are the core part of HTTP requests and responses and contain important information about the server, content, security settings, and more.

What are HTTP Headers?

HTTP headers are metadata that provides additional information about an HTTP request or response. They are transmitted between a client (e.g., a web browser) and a server as part of the HTTP protocol.

Common HTTP Headers:

• Response Headers: Headers sent from the server to the client
• Content-Type: The media type of the resource
• Server: Information about the server software
• Cache-Control: Directives for caching mechanisms
• Content-Length: The size of the response body in bytes
• Set-Cookie: Used to set a cookie on the client
• Request Headers: Headers sent from the client to the server
• User-Agent: Information about the client's browser/application
• Accept: Media types the client is willing to accept
• Cookie: Previously set cookies
• Referer: The address of the previous web page
• Host: The domain name of the server

Security Headers:

Security headers are HTTP response headers that help to improve the security of a website by enabling browser security policies:

• Strict-Transport-Security (HSTS): Forces secure connections (HTTPS)
• Content-Security-Policy (CSP): Controls resources the browser is allowed to load
• X-Content-Type-Options: Prevents MIME type sniffing
• X-Frame-Options: Protects against clickjacking
• X-XSS-Protection: Enables cross-site scripting filters in browsers
• Referrer-Policy: Controls how much referrer information is included with requests

Why Check HTTP Headers?

• Security Assessment: Identify missing security headers or misconfigured settings
• Performance Optimization: Check caching directives and compression settings
• Debugging: Troubleshoot issues related to content delivery or browser behavior
• Server Information: Understand what technology a website is using
• Compliance: Verify that appropriate headers are in place for regulatory requirements