WebSockets does not have support for extensions

[vanillajonathan]

The WebSocket class does not have support for extensions. Which is part of the rfc6455 standard:
https://tools.ietf.org/html/rfc6455#section-9

It should read the Sec-WebSocket-Extensions HTTP header from the client.

The WebSocket class does not expose a Extensions property.

[vanillajonathan]

Depends on upstream support in System.Net.WebSockets.

Depends on issue dotnet/corefx#11874.

[Tratcher]

Did you have any specific extensions you want to use?

[vanillajonathan]

No, this exposes to the server the extension(s) that the client requests.
Then the server have to negotiate with the client and send back which extensions it supports.

Then any extension has to be implemented by the client and the server on top of this which only exposes the requested extension.

[Tratcher]

Note this hasn't been done yet because there has been little interest expressed for any websocket extensions. We're unlikely to add the the property if we don't think it will actually get used.

[aspnet-hello]

This issue was moved to dotnet/aspnetcore#2715