static class Content {
	String error;
	String message;
}

Unirest.get(url)
	.asBytes()
	.ifFailure((HttpResponse<byte[]> httpResponse) -> {
		// this will invoke BaseResponse.getErrorBody
		// which will invoke getBody() that returns the byte array
		// and the byte array passed through `config.getObjectMapper().writeValue(body)`
		// which returns something like Arrays.toString(byteArray)
		Content error = response.mapError(Content.class);
		response.getParsingError()
			// no parsing error here actually, the object will be empty
			.ifPresent(e -> logger.error("Unable to parse body", e));
		if (error.message == null) {
			// this will have the same result as Arrays.toString(body)
			// not the actual string representation constructed from the byte array, like new String(body)
			System.out.println(response.mapError(String.class));
		}
	});

String url = "https://httpbin.org/bytes/-1";
Unirest.get(url)
	.asBytes()
	.ifFailure((HttpResponse<byte[]> httpResponse) -> {
		// we don't really know the response encoding, since it's stored in the request, doh, assuming UTF-8
		String body = httpResponse.mapBody(bytes -> new String(bytes, StandardCharsets.UTF_8));
		System.out.println(body);
		// this should have printed the same HTML as above
		System.out.println(httpResponse.mapError(String.class));
	});