Online tool to parse HTTP request and response headers for websites or APIs, helping developers debug and optimize network communications.
User Agent String Parser
Parse User-Agent strings from HTTP request headers to extract detailed technical information, including browser, operating system, and device type.
GZIP Compression Checker
Enter a webpage URL to instantly check if GZIP compression is enabled. Estimate compression ratios and file size savings to optimize website performance.
HTTP Status Codes Reference Guide
Provides developers and DevOps engineers with complete definitions, category explanations, and RFC specification sources for HTTP status codes.
HTTP Request Methods Cheat Sheet
Look up definitions, semantics, idempotency, and safety of HTTP request methods to assist with web development and API design.
Brotli Compression Checker
Check if a specific URL's HTTP response has Brotli compression enabled to analyze compression performance and optimize website speed.
When debugging websites, a lack of transparency in HTTP headers often makes it difficult to troubleshoot performance bottlenecks and security vulnerabilities. By initiating a standard HTTP GET request, this tool captures and parses the complete Request Headers and Response Headers returned by the target URL. It provides a clear view of key metadata such as status codes, content types, caching policies, and security policies. HTTP headers are key-value pairs used in the HTTP protocol to transfer metadata, covering control information for both client requests and server responses.
Can the HTTP header checker follow redirects?
Yes. The tool automatically follows 3xx status code redirect chains and displays the headers of the final response.
Why are some security headers, like CSP, missing?
Certain security headers (like Content-Security-Policy) are only returned if specifically configured on the server. If the target site hasn't enabled them, they won't appear in the response.
Avoid sending high-frequency requests to the same domain to prevent rate limiting. This tool only simulates basic GET requests and does not support custom methods or headers. Results may vary dynamically depending on network conditions and server configurations.
When analyzing caching strategies, focus on the Cache-Control and ETag fields. For CDN-accelerated sites, you can check cache hit status using the X-Cache or Via headers. For example, checking https://example.com might return Cache-Control: max-age=3600 along with CDN-specific X-Cache-Hits headers.
