David Wojtowicz

Thank you for sharing these changes. I was just about to implement similar functionality myself. In my case, the content at the source periodically changes, but the URL doesn't and...

I think the json serialization problem is the cause of the assignment problem. (The exception thrown when doing the assignment from another DotObject comes from inside the json serialization)

A PR was submitted that brings Guzzle (and other dependencies) up to date. If not yet merged, see [https://github.com/wojtow/RabbitMQ-Management-API-Client](https://github.com/wojtow/RabbitMQ-Management-API-Client) "circa2019" branch