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Understanding HTTP Essentials: Basics, Messages, Requests, Responses & More

Explore the basics of HTTP protocol, OSI model, URL structures, message flow, methods, status codes, and TLS/SSL connections. Enhance your knowledge with examples and detailed explanations.

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Understanding HTTP Essentials: Basics, Messages, Requests, Responses & More

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  1. The Basics of HTTPJason Deanhttp://www.12robots.com

  2. About Me • Web Application Developer with the Minnesota Department of Health (MDH)‏ • Chairperson and User Group Manager of the MDH ColdFusion User Group • Web Development Blogger (http://www.12robots.com) • Veteran of the U.S. Coast Guard

  3. Overview

  4. HTTP on the OSI Model

  5. Resources

  6. HTTP URL Basics • <scheme>://<host>:<port>/<path>?<query>#<frag> • Example:

  7. HTTP Messages

  8. HTTP Message Flow

  9. HTTP Message Parts

  10. Requests

  11. Request Methods GET POST PUT DELETE HEAD OPTIONS TRACE

  12. Responses

  13. Status Codes 403 Forbidden 401 Unauthorized 302 Found 404 Not Found 301 Moved Permanently 200 OK 500 Internal Server Error

  14. TLS/SSL

  15. TLS/SSL Connection

  16. SSL Handshake

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