Basics of HTTP - Nafis Fuad
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This document provides an overview of the basics of HTTP (Hypertext Transfer Protocol). It discusses the history and problems that HTTP solved, the TCP/IP model, pillars of HTTP including paths, methods, status codes and headers. It also describes the client-server workflow involving opening a TCP connection, sending requests and reading responses. Key aspects covered include connection management, status codes, methods, headers for authentication, caching, conditionals, cookies, CORS and security. Finally, it notes why HTTP is designed as simple, extensible, stateless but not sessionless, and connection efficient, before concluding with a brief discussion of HTTPS.
Basics of HTTP - Nafis Fuad
- 1. Basics of HTTP All you need to know(for now) 1
- 2. A little bit of History first âą Problems before HTTP âą What is HTTP? âą How HTTP solved the problem? 2
- 4. Pillars of HTTP âą Path âą Methods âą Status Codes âą Headers 4
- 5. Client-Server workflow âą Open a TCP connection âą Send HTTP request 5 https://developer.mozilla.org/en-US/docs/Web/HTTP/Overview
- 6. Client-Server workflow(cont.) âą Read the response sent by the server âą Close or reuse the connection for further requests 6 https://developer.mozilla.org/en-US/docs/Web/HTTP/Overview
- 11. HTTP headers âą End-to-end headers âą These headers must be transmitted to the final recipient of the message âą Hop-by-hop headers âą These headers are meaningful only for a single transport-level connection, and must not be retransmitted by proxies or cached. 11
- 12. A few headers Authentication âą WWW-Authenticate âą Authorization âą Proxy-Authenticate âą Proxy-Authorization 12
- 13. HTTP response caching 13 https://developer.mozilla.org/en-US/docs/Web/HTTP/Caching
- 14. A few headers(cont.) Caching âą Age âą Cache-Control(Pragma for HTTP/1.0) âą Clear-Site-Data âą Expires 14
- 15. A few headers(cont.) Conditionals âą ETag âą Last-Modified âą If-Match âą If-Modified-Since âą Vary 15
- 16. A few headers(cont.) Connection management âą Connection âą Keep-Alive(args = {timeout, max}) Content Negotiation âą Accept: <MIME_type>/<MIME_subtype> âą Accept-{Charset, Encoding, Language} 16
- 17. A few headers(cont.) Cookies âą Cookie: <cookie-list> âą Set-Cookie: <cookie-name>=<cookie-value> 17 https://medium.com/@piraveenaparalogarajah/sessions-and-cookies- 2c0919552f29
- 18. A few headers(cont.) CORS âą Access-Control-Allow-Origin âą Access-Control-Allow-Credentials âą Access-Control-Allow-Methods âą Access-Control-Allow-Headers Security âą Content-Security-Policy âą Expect-CT âą Strict-Transport-Security (HSTS) 18
- 19. A few headers(cont.) Others âą Do Not Track âą Download âą Ranged Request âą Redirects, etc 19
- 20. Why HTTP âą HTTP is simple âą HTTP is extensible âą HTTP is stateless, but not sessionless âą HTTP is connection efficient 20
- 22. Thank You 22