Use-cases for sockets API on the web

Owen Campbell-Moore, one of Chrome's PM's for Progressive Web Apps and new APIs asked the following question, and instantly Surma (that is the only name we know for him) said "Sockets"

I also threw in my two pennies, and Marcos Ceres asked for use-cases.

So here is a list of Apps that people have told me they want to build to host inside a browser. It includes client apps but also Services and Servers.

Outgoing connections

The TL;DR is anything normally has to proxy and convert web requests via a web server to another host.

Incoming connections

Mostly the TL;DR here is, a server for everything in the above list.

If you have any other examples let me know and I can include them here.

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