HTTP Header Analyser And Tester Free

Enter a URL to analyze its HTTP headers.

Results will appear here.


What are HTTP Headers?

HTTP (Hypertext Transfer Protocol) headers are a core part of HTTP messages, which are exchanged between a client (like your web browser) and a server. They provide essential information about the request or the response, allowing the client and server to communicate effectively and handle various aspects of web communication, such as caching, authentication, content type, and more.

  • Request Headers: Sent by the client to the server (e.g., User-Agent, Accept, Cookie).
  • Response Headers: Sent by the server to the client (e.g., Content-Type, Cache-Control, Server, Set-Cookie).

Why are HTTP Headers Important?

HTTP headers play a crucial role in how websites function and how secure they are. They are vital for:

  • Content Negotiation: Determining the best format for content (e.g., English vs. Spanish, HTML vs. JSON).
  • Caching: Controlling how browsers and proxies store and reuse content to speed up page loading.
  • Security: Implementing security policies like Content Security Policy (CSP), X-Frame-Options, HSTS to protect against common web vulnerabilities.
  • Authentication: Handling user login sessions and authorization.
  • Redirections: Informing the client about a new location for a resource (e.g., 301 Moved Permanently).
  • Debugging and Troubleshooting: Developers use headers to understand how a server is responding and to diagnose issues.
  • SEO: Certain headers can influence how search engines crawl and index content.

Key HTTP Headers You Might Encounter:

  • Content-Type: Indicates the media type of the resource (e.g., text/html, application/json).
  • Cache-Control: Directives for caching mechanisms in both requests and responses.
  • Set-Cookie / Cookie: Used for sending cookies from the server to the client and vice versa for session management.
  • Location: Used in redirection responses to indicate the URL to redirect to.
  • User-Agent: Identifies the client software originating the request (e.g., browser name and version).
  • Server: Information about the web server software.
  • X-Frame-Options: Prevents clickjacking attacks by indicating whether a browser should be allowed to render a page in a <frame>, <iframe>, <embed>, or <object>.
  • Content-Security-Policy (CSP): A powerful security header that helps prevent cross-site scripting (XSS) and other code injection attacks.
  • Strict-Transport-Security (HSTS): Enforces secure (HTTPS) connections to the server.
  • X-Content-Type-Options: Prevents browsers from MIME-sniffing a response away from the declared content-type.
  • Referrer-Policy: Controls how much referrer information is included with requests.

How to Use Our HTTP Header Analyzer Tool:

Simply enter a full URL (e.g., https://www.google.com or http://example.com/api/data) into the input field above and click "Analyze Headers." Our tool will fetch the HTTP response headers for that URL and display them in a clear, tabular format. This can be incredibly useful for web developers, security professionals, and anyone curious about how websites communicate!