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I have to deal with a third party api that I canno't change, they are using oAuth, however in case the access token is invalid, the Server does not respond with 401 instead with 500 and a custom error code in the response body. How can I rewrite the Response in such a way that the ktor client uses the `refreshTokens` method provided ?

I already tried using _`HttpResponseValidator`_  with `handleResponseExceptionWithRequest` but I can only throw another Exception in there and not sure wich i need to throw to let the client react with refreshTokens.

The standard `Auth` plugin :

```install(Auth) {
    bearer {
        loadTokens {
            ....
        }
        refreshTokens {
             ....
        }
    }
}```

You can try using this <https://youtrack.jetbrains.com/issue/KTOR-580#focus=Comments-27-5135012.0-0|workaround>.

I already tried that, however i cannot access `body()` in there unfortunatley and i need to parse the responses content json

``` io.ktor.client.call.NoTransformationFoundException: No transformation found: class io.ktor.utils.io.ByteBufferChannel (Kotlin reflection is not available)```
This is what I get to be perceise. when I do the following:

``` install("CustomAuthError") {
                receivePipeline.intercept(HttpReceivePipeline.Before) { response -&gt;
                    if (response.status == HttpStatusCode.InternalServerError) {
val error = response.body&lt;ErrorContent&gt;()```


The Solution otherwise would work I just unfortunately cannot access the content body :confused: