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WebSockets
The document discusses the WebSocket protocol, highlighting its standards set by the Internet Engineering Task Force and the World Wide Web Consortium. It emphasizes the efficiency of WebSockets for real-time web communication compared to traditional HTTP pooling, showcasing significant reductions in protocol overhead. The conclusion indicates that WebSockets are preferable due to their full-duplex capability and minimal network traffic usage.
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WebSockets
- 1. WEBSOCKETS Rodr igo Constantin Ctenas Zaccar a 6367629 Wednesday, November 23, 2011
- 2. STANDARDIZATION • Internet Engineering Task Force • Protocol • World Wide Web Consortium • JavaScript API Wednesday, November 23, 2011
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- 4. HANDSHAKE • HTTP • Connection: upgrade • Upgrade: websocket • Sec-WebSocket-* headers Wednesday, November 23, 2011
- 5. MESSAGE EXCHANGE 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-------+-+-------------+-------------------------------+ |F|R|R|R| opcode|M| Payload len | Extended payload length | |I|S|S|S| (4) |A| (7) | (16/63) | |N|V|V|V| |S| | (if payload len==126/127) | | |1|2|3| |K| | | +-+-+-+-+-------+-+-------------+ - - - - - - - - - - - - - - - + | Extended payload length continued, if payload len == 127 | + - - - - - - - - - - - - - - - +-------------------------------+ | |Masking-key, if MASK set to 1 | +-------------------------------+-------------------------------+ | Masking-key (continued) | Payload Data | +-------------------------------- - - - - - - - - - - - - - - - + : Payload Data continued ... : + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + | Payload Data continued ... | +---------------------------------------------------------------+ Wednesday, November 23, 2011
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- 7. METHODS • send • Callback style • onopen • onclose • onerror • onmessage Wednesday, November 23, 2011
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- 9. HTTP POOLING • protocol overhead: 600 bytes users Traffic (bytes) Traffic (Mbps) 1000 600000 4.5 10000 6000000 45 100000 60000000 450 Wednesday, November 23, 2011
- 10. WEBSOCKET • protocol overhead: 2 bytes users Traffic (bytes) Traffic (Mbps) 1000 2000 0.019 10000 20000 0.19 100000 200000 1.9 Wednesday, November 23, 2011
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- 12. CONCLUSION • WebSocket is the choice for web real time communication • Very efficient network traffic • Full duplex (connection always ready for client and server) Wednesday, November 23, 2011
- 13. WEBSOCKETS Rodr igo Constantin Ctenas Zaccar a 6367629 Wednesday, November 23, 2011