My endpoint correctly returns XML but RestSharp is failing to deserialize the object. Manually overriding the request "Accept" header causes the endpoint to return JSON and properly deserialize.

RestSharp is a lightweight HTTP API client library. It's a wrapper around HttpClient, not a full-fledged client on its own. What RestSharp adds to HttpClient: Default parameters of any kind, not just ...

At its core, communicating with an API simply involves creating and sending an HTTP request to the API, and then doing something with the response. Most modern APIs will return JSON, though you may ...

RestSharp makes it easy by abstracting away some of the complication of dealing with raw HTTP requests and providing a developer-friendly way of getting at what's important: the data.