Hello everyone

I have setup a Docker compose file with a custom image to launch ASP.NET Core MVC app with dotnet watch run.
However, I can't make a browser to auto reload when some code has been changed.

This is because a container does not publish a port number that aspnetcore-browser-refresh.js use to create a WebSocket connection.

I found that we have ASPNETCORE_AUTO_RELOAD_WS_ENDPOINT defined in
https://github.com/dotnet/sdk/blob/release/5.0.2xx/src/BuiltInTools/BrowserRefresh/BrowserScriptMiddleware.cs#L23 but setting a value of ASPNETCORE_AUTO_RELOAD_WS_ENDPOINT environment variable does not change a WebSocket endpoint.
It always get a random port number whenever we run dotnet watch run and cause me to not be able to configure a published port number in a Docker compose file.

Here is a screenshot of the WebSocket issue.

How to reproduce an issue:

Please follow the instruction in this README https://github.com/codesanook/Codesanook.EFNote#how-to-run-the-project-locally

My development environment

• Windows 10 Pro x64 10.0.19042
• WSL2, Ubuntu 18.04
• Source code in WSL2 directory
• Docker desktop Windows version 20.10.5, build 55c4c88 with Enable integration with my default WSL distro
• .NET version 5.0.202
• VS Code 1.55.2
• Base image mcr.microsoft.com/dotnet/sdk:5.0 https://github.com/codesanook/Codesanook.EFNote/blob/main/Dockerfile#L2

Please could you help me figure it out how to make a stick port number of WebSocket in a browser reload script?
Thanks.

Other useful information

• WebSocketScriptInjection.js code
• docker-compose down --volumes to remove a container with its volumes.