@Override
    public String toString() {
        return toStringHelper(this).omitNullValues()
                                   .add("ctx", ctx)
                                   .add("eventLoop", eventLoop)
                                   .add("responseStarted", responseStarted)
                                   .add("maxContentLength", maxContentLength)
                                   .add("contentLengthHeaderValue", contentLengthHeaderValue)
                                   .add("delegate", delegate)
                                   .toString();
    }
This method is called when the delegate is completed.
core/src/main/java/com/linecorp/armeria/client/HttpResponseWrapper.java