presto-proxy/src/main/java/io/prestosql/proxy/ProxyResponseHandler.java/ProxyResponseHandler/readBody
class ProxyResponseHandler:    private static String readBody(Response response)
    {
        try {
            return new String(toByteArray(response.getInputStream()), US_ASCII);
        }
        catch (IOException e) {
            return "";
        }
    }