Why does the async client accept the client type along with */*
常规客户端只接受客户端类型 https://github.com/ServiceStack/ServiceStack/blob/master/src/ServiceStack.Common/ServiceClient.Web/XmlServiceClient.cs#L32
Also, is the best way to accept */* (or application/atom+xml,
which is what i need) to create a new service client for non-async calls?