Learn HTTP/Networks (Including CORS & WebSockets)

HTTP - The Hypertext Transfer Protocol (HTTP) is an application protocol for distributed, collaborative, hypermedia information systems. HTTP is the foundation of data communication for the World Wide Web.

— Wikipedia

CORS - Cross-origin resource sharing (CORS) is a mechanism that allows restricted resources (e.g., fonts) on a web page to be requested from another domain outside the domain from which the resource originated.

— Wikipedia

WebSockets - WebSocket is a protocol providing full-duplex communication channels over a single TCP connection. The WebSocket protocol was standardized by the IETF as RFC 6455 in 2011, and the WebSocket API in Web IDL is being standardized by the W3C.

— Wikipedia

HTTP Specifications

• HTTP/2
• Hypertext Transfer Protocol -- HTTP/1.1

HTTP

• High Performance Browser Networking: What Every Web Developer Should Know About Networking and Web Performance [read]
• HTTP: The Definitive Guide (Definitive Guides) [read][$]
• HTTP/2 Frequently Asked Questions [read]
• HTTP Fundamentals [watch][$]
• HTTP/2 Fundamentals [watch][$]
• HTTP: The Protocol Every Web Developer Must Know - Part 1 [read]
• HTTP: The Protocol Every Web Developer Must Know - Part 2 [read]
• HTTP Succinctly [read]

HTTP Status Codes

• HTTP Status Codes
• HTTP Status Codes in 60 Seconds [watch]

CORS Specifications

• Cross-Origin Resource Sharing

CORS

• CORS in Action [read][$]
• HTTP Access Control (CORS) [read]

WebSockets

• Connect the Web With WebSockets [watch]
• WebSocket: Lightweight Client-Server Communications [read][$]
• The WebSocket Protocol [read]