unregistering servers using trash icon button not working

[pobodysnerfect]

I'm currently running spring boot 2.6.2, and spring boot admin 2.6.2, and all the clients that are registering with the server are using spring boot admin client 1.5.2. I realize this isn't the recommended setup (we will be updating our services to the latest spring boot in time), but its unclear to me if this bug is related to that or not.

to reproduce, open up the instances and click on the trash icon:

Nothing happens, and I get this stack trace in the console:

Axios.js:40 Uncaught (in promise) Error: Provided config url is not valid
at l.request (Axios.js:40:11)
at l.r.forEach.l. [as delete] (Axios.js:136:17)
at Function.delete (bind.js:9:15)
at t. (instance.js:55:23)
at l (runtime.js:63:40)
at Generator._invoke (runtime.js:294:22)
at Generator.next (runtime.js:119:21)
at r (asyncToGenerator.js:3:20)
at s (asyncToGenerator.js:25:9)
at asyncToGenerator.js:32:7

It seems like its trying to call this:

https://github.com/codecentric/spring-boot-admin/blob/master/spring-boot-admin-server-ui/src/main/frontend/services/instance.js#L55

but its failing because axios isn't configured. I also noticed that the registration source is "http-api", which seems to suggest unregistering isn't possible:

https://github.com/codecentric/spring-boot-admin/blob/master/spring-boot-admin-server-ui/src/main/frontend/services/instance.js#L51

but that would definitely be useful for us.

Expected: the trash icon should work and it should unregister the server
Actual: nothing happens and i get an exception in the console.

[chrisdev0]

Perhaps related to axios/axios#4407?

[erikpetzold]

Should be fixed with new axios version, we just merged #1994