@Override
    public String toString() {
        return "SimpleBody{content length=" + (bodyAsBytes != null ? bodyAsBytes.length : "chunked") +
                ", content type=" + contentType + "}";
    }
Tests whether the body is currently cached as a byte array.

@return whether the body is currently cached as a byte array.
httpclient5/src/main/java/org/apache/hc/client5/http/async/methods/SimpleBody.java