Around IT In 256 Seconds By Tomasz Nurkiewicz

Podcast for developers, testers, SREs… and their managers. I explain complex and convoluted technologies in a clear way, avoiding buzzwords and hype. Never longer than 4 minutes and 16 seconds.

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3 November 2020

#21: SSE and WebSockets

by Tomasz Nurkiewicz

HTTP is historically request-response-driven. This means a server is idle as long as no-one asks it to do something. Typically fetching data or accepting some form. In reality, we’d often like to receive data from the server without any request. Typically to subscribe for some server-side updates. For example displaying a current price on the stock exchange that changes many times per second. Or when waiting for some asynchronous process to complete. Traditionally this could be achieved with a few hacks. The most obvious and the worst one is busy-waiting. You simply keep asking the server over and over again periodically. More frequent requests result in a lot of excessive network traffic. Less frequent requests increase latency, so it’s no longer real-time communication.

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tags: sse - websocket - http - EventSource