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Server-Sent Events: an alternative to WebSockets (germano.dev)

540 points by tyrion · 1678 days ago · 263 comments on HN

Article summary

The article discusses Server-Sent Events (SSE) as an alternative to WebSockets for real-time web applications, highlighting SSE's simplicity and ability to work seamlessly on top of HTTP. SSE enables the server to send low-latency push events to the client, making it suitable for applications where the bulk of the data is sent from the server. However, SSE is not suitable for applications that require two-way, low-latency communication. The article also explores the limitations of WebSockets, including lack of support for compression, multiplexing, and protection from Cross-Site Hijacking.

Main themes

  • Server-Sent Events
  • WebSockets
  • Real-time Web Applications
  • HTTP/2
  • Multiplexing
  • Compression
  • Scalability
  • Performance

What commenters say

  • SSE is a viable alternative to WebSockets for many real-time web applications due to its simplicity and ability to work on top of HTTP.
  • WebSockets have limitations, including lack of support for compression and multiplexing, which can be significant drawbacks for certain use cases.
  • SSE may not be suitable for applications that require bidirectional communication, and WebSockets may be a better choice in such cases.
  • The choice between SSE and WebSockets depends on the specific requirements of the application, including the direction and volume of data flow.
  • HTTP/2 can mitigate some of the limitations of SSE, such as head-of-line blocking, and make it a more viable option for real-time applications.
  • SSE can be used in conjunction with other techniques, such as sending 'noop' messages, to achieve reliable and efficient communication.
  • The use of SSE or WebSockets depends on the trade-off between complexity, scalability, and performance requirements of the application.
  • Some developers prefer SSE due to its ease of use and ability to scale, while others prefer WebSockets for its ability to handle bidirectional communication.