HTTP Header Checker
Analyze HTTP response headers and server information for any URL instantly
Free HTTP Header Analysis Tool
Our comprehensive HTTP Header Checker analyzes response headers, status codes, CORS policies, and server configurations. Essential for web developers, API testers, and security professionals to debug applications and verify proper configurations.
HTTP Response Analysis
Response Status
Status Code
Status Text
Response Time
Response Headers
Request Information
Request Details
Security & Protocol
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Frequently Asked Questions
What are HTTP headers?
HTTP headers are key-value pairs sent between web browsers and servers that contain important information about the request or response. They control caching, authentication, content type, CORS policies, security settings, and many other aspects of web communication.
Why should I check HTTP headers?
Checking HTTP headers helps with debugging web applications, verifying security configurations, testing API responses, analyzing caching behavior, and ensuring proper CORS setup. It's essential for web developers, security professionals, and API developers to troubleshoot connectivity issues and optimize performance.
What is CORS and why does it matter?
CORS (Cross-Origin Resource Sharing) is a security feature that controls which domains can access resources on a web server. Our tool helps you check if CORS headers are properly configured, which is crucial for modern web applications that make cross-origin requests to APIs and external services.
How do I interpret HTTP status codes?
HTTP status codes are three-digit numbers that indicate the result of an HTTP request. 2xx codes mean success, 3xx indicate redirection, 4xx show client errors (like 404 Not Found), and 5xx indicate server errors. Our tool color-codes these for easy interpretation and provides detailed status text.
Is the HTTP Header Checker tool free?
Yes, our HTTP Header Checker is completely free to use. There are no limitations on the number of checks you can perform or URLs you can analyze. The tool works directly in your browser for maximum privacy, speed, and security.