Retireve message when failure from REST API.

[CodeServant]

I want to get the error message that is from REST server response, but I can't do it.
I have rest call like that

val restClient = RestClient()
        val premise = restClient.call<ChangeResp, DullChangeReq>(
            url = "$url/$id",
            data = changeReq
        ) {
            method = HttpMethod.PUT
            authorize()
        }
        premise.then(onFulfilled, onRejected)

and onRejected is defined like that

onRejected = {
        failToast(
           it.message,
            "insertion failed"
        )
    }

but the it.message appears to be empty string, and in fact cause is null.
My rest response is

{"timestamp":"2025-01-23T21:02:54.082+00:00","status":400,"error":"Bad Request","message":"Edge would induce a cycle","path":"/api/workflowGraphs"}

and this json is absolutely expected by me.
Is this error or am i missing something?

[rjaros]

Hello.
I think the exception you get in the onRejected callback should be RemoteRequestException. Try something like this:

onRejected = {
    console.log((it as? RemoteRequestException).response.body)
}

[CodeServant]

there is something like this after

ReadableStream { locked: false }

this is the console output

[rjaros]

There is another Promise in the response object. You can use a code like this:

(it as? RemoteRequestException)?.response?.json()?.then { 
    console.log(it)
}

[CodeServant]

ok something like this worked

(it as? RemoteRequestException)?.response?.json()?.then {
    console.log(it.asDynamic().message)
}

thanks