@UnstableApi
    public TransformingRequestPreparation<AggregatedHttpResponse, ResponseEntity<byte[]>> asBytes() {
        return as(AggregatedResponseAs.bytes());
    }
Converts the response content into bytes.
For example:
<pre>{@code
BlockingWebClient client = BlockingWebClient.of("https://api.example.com");
ResponseEntity<byte[]> response = client.prepare()
                                        .get("/v1/items/1")
                                        .asBytes()
                                        .execute();
}</pre>
core/src/main/java/com/linecorp/armeria/client/BlockingWebClientRequestPreparation.java