Under the hood (as in how the server is implemented), HTTP streaming and websockets are virtually identical - apart from the initial handshake which is more complicated when done with HTTP obviously. If you wrote your own websocket server in C (ala Caplin), you could probably reach those numbers without too much difficulty. Thanks for contributing an answer to Stack Overflow! At 5,000 users (total of 250k events/sec streamed) the latency is 2 milliseconds. Applications can use the CometD libraries to write transport-independent applications, and CometD will take care of the transport details.
As far as performance is concerned, most benchmarks concentrate on server to client messages - numbers of users, numbers of messages per second, and the latency of those messages. Bash arithmetic outputs result in decimal. If multipart-replace is used then there is additional data sent to delimit the message parts. WebSocket is a computer communication protocol that enables us full-duplex communication channels over a single transfer control protocol (TCP) connection. Some benchmarks: This significantly reduces the overhead (no socket creation and management for every request/response), but it does mean that to scale a server above 64k separate simultaneous client hosts you will need to use tricks like multiple IP addresses on the same server.
A word for a secret organisation that controls the government, Comet HTTP polling - including long polling, Comet HTTP streaming - server to client messages use a single persistent socket with no HTTP header overhead after initial setup, Comet WebSocket - single bidirectional socket.
@leggetter, do you have any data on Caplin's HTTP streaming latencies (round-trip) vs Caplin WebSockets? Do HTML WebSockets maintain an open connection for each client? CometD is a scalable WebSocket and HTTP based event and message routing bus. Actually, HTTP and WebSockets are quite different. But you really should consider EventSource (aka Server-Sent Events) as an option too.
What command will give me a binary delta between two files and let me apply it? They are often implemented in the same server, but after that they are very different. The Comet approach differs from the original model of the web, in which a browser requests a complete web page at a time. However, if you have two messages (server to client) in quick succession then the second one will not arrive at the client until a new request is made after the first message is received. The WebSocket handshake is designed to be compatible with HTTP so that both services can share the same port. How do I politely turn down requests to show wedding photos? Contact us.
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