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48.5. Configuring the Client Endpoint

Overview
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It is possible to augment the functionality of the base javax.ws.rs.client.Client object by registering and configuring features and providers.

Example
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The following example shows a client configured to have a logging feature, a custom entity provider, and to set the prettyLogging property to true: 
// Java
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.Client;
import org.apache.cxf.feature.LoggingFeature;
...
Client client = ClientBuilder.newClient();
client.register(LoggingFeature.class)
      .register(MyCustomEntityProvider.class)
      .property("LoggingFeature.prettyLogging","true");
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Configurable API for registering objects
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The Client class supports the Configurable API for registering objects, which provides several variants of the register method. In most cases, you would register either a class or an object instance, as shown in the following examples: 
client.register(LoggingFeature.class)
client.register(new LoggingFeature())
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For more details about the register variants, see the reference documentation for Configurable.

What can you configure on the client?
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You can configure the following aspects of a client endpoint:
  • Features
  • Providers
  • Properties
  • Filters
  • Interceptors

Features
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A javax.ws.rs.core.Feature is effectively a plug-in that adds an extra feature or functionality to a JAX-RS client. Often, a feature installs one or more interceptors in order to provide the required functionality.

Providers
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A provider is a particular kind of client plug-in that provides a mapping capability. The JAX-RS 2.0 specification defines the following kinds of provider:
Entity providers
An entity provider provides the capability of mapping between a specific media type a Java type. For more details, see Section 48.4, “Parsing Requests and Responses”.
Exception mapping providers
An exception mapping provider maps a checked runtime exception to an instance of Response.
Context providers
A context provider is used on the server side, to supply context to resource classes and other service providers.

Filters
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A JAX-RS 2.0 filter is a plug-in that gives you access to the URI, headers, and miscellaneous context data at various points (extension points) of the message processing pipeline. For details, see Chapter 60, JAX-RS 2.0 Filters and Interceptors.

Interceptors
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A JAX-RS 2.0 interceptor is a plug-in that gives you access to the message body of a request or response as it is being read or written. For details, see Chapter 60, JAX-RS 2.0 Filters and Interceptors.

Properties
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By setting one or more properties on the client, you can customize the configuration of a registered feature or a registered provider.

Other configurable types
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It is possible, not only to configure a javax.ws.rs.client.Client (and javax.ws.rs.client.ClientBuilder) object, but also a WebTarget object. When you change the configuration of a WebTarget object, the underlying client configuration is deep copied to give the new WebTarget configuration. Hence, it is possible to change the configuration of the WebTarget object without changing the configuration of the original Client object.
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