SignalR Connection continuous reconnect due to MessagePack (version 5.0.1)

[teliu-ez]

Describe the bug

I got an issue that signal will continuous reconnect when I update MessagePack to latest version(5.0.1). I can fix this issue by degrade MessagePack to version 3.1.10. Could someone help to take a look at this?.net core: 3.1. SignalR: 1.6.1

Exceptions (if any)

No exception found

Further technical details

ASP.NET Core version: 3.1
SignalR version: 1.6.1
IDE: visual studio

[BrennanConroy]

Can you share what your Hub and client are doing? Does the issue repro outside of Azure SignalR?

[teliu-ez]

Here is client side hub setting.

the front end and the back end just pass some messages to each other.
This issue is only related to SignalR. I fix this by degrade MessagePack to version 3.1.10.

[BrennanConroy]

Likely a dupe of #28354
Can you show your server logs? There is probably something like "Failed to load System.Text.Encodings.Web 5.0.0"

[teliu-ez]

Thanks very much @BrennanConroy .
Including a reference to System.Text.Encodings.Web 5.0.0
Or
Downgrading your SignalR.MessagePack reference to 3.1
can fix my issue.

[teliu-ez]

I have a question is if the MessagePack (version 5*) is designed for .netcore 5 and MessagePack (version 3*) is designed for .netcore 3? @BrennanConroy

[BrennanConroy]

Kind of, but not really. You're just hitting a bug with the System.Text.Json package and .net core 3.1.