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Can anybody give me a hint, how I can access the actual response body in a ktor server plugin within the `ResponseBodyReadyForSend` hook?
I have found the `onCallRespond` callback, but I want to be sure, that I get the final response body content which is not further transformed or modified before sent to the client.

The second parameter of the handler for `on(ResponseBodyReadyForSend)` is the response body after all transformations.

```val plugin = createApplicationPlugin("myplugin") {
    on(ResponseBodyReadyForSend) { call, content -&gt;
        println(content)
    }
}```

The second param is of type `OutgoingContent` which has several properties like `contentType`, `headers`, `status` but none for the response body itself.
How doe I get the response body from that content?

Since `OutgoingContent` is a sealed class, you can check the actual type and, depending on it, read the body. Here is an example:
```on(ResponseBodyReadyForSend) { call, content -&gt;
    when(content) {
        is OutgoingContent.ByteArrayContent -&gt; {
            content.bytes() // ByteArray
        }

        is OutgoingContent.ReadChannelContent -&gt; {
            content.readFrom() // ByteReadChannel
        }

        // ...
    }
}```

one more question: it seems, adding another header within `ResponseBodyReadyForSend` is not possible, because:
• adding it to ``call.response.headers`  has no effect
• modifying `content.headers` is not possible, as `io.ktor.http.Headers` has no methods for appending an header
Right?

Appending a header through `call.response.headers` should work.