[binding-http] How to use readmultipleproperties operation with a usual REST Client

The hosted TestThing has the meta interaction `readmultipleproperties`, however, how would I execute this operation with a REST Client like Postman? What is the needed HTTP request?

I have tried sending a GET request to `http://plugfest.thingweb.io:8083/TestThing/all/properties` with the body of the request being an array like `["bool","int"]` but I still get all the properties.