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A comment on The Need for Web UDP. Parent comment

Re:The Need for Web UDP by LunaSea on Wednesday July 26, 2017 @06:56PM (#14861143)
Not having raw TCP means you can't speak to any existing TCP protocol through a browser. It might not be a useful feature but I think that not taking it into account is an issue because most use cases can't be implemented with WebSockets.
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Re:The Need for Web UDP by mrmoka on Wednesday July 26, 2017 @07:04PM (#14861192)
Ability to connect to raw TCP or UDP from a browser is a major security hole.

Due to that, WebSockets were created were handshake is handled by browser transparently from developer ensuring port scanning is not possible. As well as to preserver origin-based security model of HTTP. Which we want for WebUDP as well.

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