WebSocket connection to 'ws://localhost:52090/sockjs-node/819/yjalqx53/websocket' failed

[dergroncki]

I am using "Microsoft.DotNet.Web.Spa.ProjectTemplates 2.0.0" and I have created the project with "dotnet new react" (no other modification). I use Visual Studio 2017:

Now I am getting the following error if I start the application:
WebSocket connection to 'ws://localhost:52090/sockjs-node/819/yjalqx53/websocket' failed: Error during WebSocket handshake: Unexpected response code: 400

The following image is showing the console output of Chrome but the same error is shown with Firefox and Internet Explorer 11 as well:

Thanks for helping!

Best regards,
Michael

[SteveSandersonMS]

My guess is that you're running on Windows 7. If so, I'm afraid that's not a supported scenario for WebSockets, because the low-level http.sys driver in Windows 7 itself can't accept WebSocket connections.

If that's not the reason, please let us know.

[k-vekos]

@SteveSandersonMS I am getting a similar error using the default Angular SPA template created by New > Project in Visual Studio 2017.

If this isn't viable on Windows 7 then what kind of functionality would I be losing as a result of WebSockets not working? And, how can I stop this error message then?

EDIT: For the record, I don't get any errors in the console if I just use "npm start" to host the SPA instead of running the server from Visual Studio.