Disposing

The HttpContent object is disposed for you, so trying to read the Content stream by caling ReadAsStringAsync() etc will throw an exception. You can access the returned content as a string by calling ToString().

Disposing of RestClient and therefore the underlying HttpClient is left up to you. The general advice is to create one instance for the lifetime of your application as the RestClient and HttpClient it wraps are generally stateless and reusable across multiple calls.

Since version 3.3.0 you have better control over the underlying HttpClient using IHttpClientFactory, which is how I now recommend you instantiate the RestClient.