Can't extract binary data after post

[kschroeer]

I'm using the REST Easy add-on in Firefox for testing my rest api. I posted some data to an endpoint and successfully got a response. I selected "custom", mime type=application/json and a json string.
But I'm not able to get the content. I can only see the header lines. If I click on "raw data" then I will see:

Unable to display binary data

The content-type of the response is applicaton/hal+json.