Handler<_, _>` is not satisfied and how to find out what is the cause of it for function with generics?

[sergeda]

Summary

I have generics in my handlers to be able to test my routes. Everything fine until this error start to appear. How can I debug the issue? I checked that all of my generics have Send + Sync + 'static but this issue still happens

axum version

7.5

[mladedav]

I think removing the generics for debug purposes and using debug_handler would be the way to go.

You can also manually check that the returned future is Send, that's usually the problem.

[sergeda]

Not very convenient but I was able to find the issue. Thank you