| AsyncInvoker | Uniform interface for asynchronous invocation of HTTP methods. | 
| Client | 
 Client is the main entry point to the fluent API used to build and execute client requests in order to consume
 responses returned. | 
| ClientBuilder | Main entry point to the client API used to bootstrap  Client instances. | 
| ClientRequestContext | Client request filter context. | 
| ClientResponseContext | Client response filter context. | 
| CompletionStageRxInvoker |  | 
| Entity | Encapsulates message entity including the associated variant information. | 
| Invocation | A client request invocation. | 
| Invocation.Builder | A client request invocation builder. | 
| InvocationCallback | Callback that can be implemented to receive the asynchronous processing events from the invocation processing. | 
| RxInvoker | Uniform interface for reactive invocation of HTTP methods. | 
| SyncInvoker | Uniform interface for synchronous invocation of HTTP methods. | 
| WebTarget | A resource target identified by the resource URI. |