HTTP Resources

The authoritative sources for HTTP standards and protocols.

• HTTP Working Group Specifications Official home of HTTP specifications maintained by the IETF
• RFC 9110 - HTTP Semantics Core HTTP concepts: methods, status codes, headers, and message format
• RFC 9111 - HTTP Caching Cache-Control, ETags, and caching mechanisms
• RFC 9112 - HTTP/1.1 HTTP/1.1 message syntax and connection management
• RFC 9113 - HTTP/2 Binary framing, multiplexing, and server push
• RFC 9114 - HTTP/3 HTTP over QUIC protocol

Comprehensive HTTP documentation with examples and explanations.

• MDN HTTP Documentation Comprehensive guides on HTTP methods, headers, status codes, and CORS
• HTTP.dev Clean reference for HTTP status codes and methods
• MDN Fetch API Modern browser API for making HTTP requests
• Node.js HTTP Module Server-side HTTP in Node.js

Tools for testing, debugging, and inspecting HTTP traffic.

• curl Command-line tool for transferring data with URLs
• HTTPie User-friendly command-line HTTP client with JSON support
• Postman API platform for building and testing HTTP requests
• Insomnia Open-source API client for REST and GraphQL
• mitmproxy Interactive HTTPS proxy for debugging and testing

Online services for testing HTTP behavior and responses.

• httpstat.us Returns any HTTP status code you request - great for testing error handling
• httpbin.org HTTP request and response testing service
• JSONPlaceholder Fake REST API for testing and prototyping
• ReqRes Hosted REST API for front-end testing
• Webhook.site Inspect and debug HTTP requests in real-time

Resources for secure HTTP configuration and best practices.

• OWASP Secure Headers Project Security header guidelines and recommendations
• Security Headers Analyze your site's HTTP security headers
• CSP Evaluator Evaluate Content Security Policy for security issues
• SSL Labs Server Test Deep analysis of SSL/TLS configuration
• Mozilla Observatory Comprehensive website security scanner