The command above will authenticate to the URI endpoint, pass the JSON sample via the HTTP POST method and tell the API that the content is JSON. If the API returns a response, Invoke-RestMethod will ...

With the RESTful API, the user cannot directly set the number of wins, losses or ties. The client can only use a POST invocation to increment values one at a time. This is not an idempotent function, ...

Solr has a HTTP/JSON-based API. However, it isn’t exactly a REST API because it doesn’t really follow any of the rules for a well-defined REST interface. I whine about this sometimes.