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{new: 8.2.0; todo} 
Interceptors

<p>
	The {@link oajr.client2.RestCallInterceptor} API provides a quick way of intercepting and manipulating requests and responses beyond
	the existing {@link org.apache.http.protocol.HttpRequestInterceptor} and {@link org.apache.http.protocol.HttpResponseInterceptor} APIs.
</p>

<ul class='javatree'>
	<li class='jc'>{@link oajr.client2.RestClientBuilder}
	<ul>
		<li class='jm'>{@link oajr.client2.RestClientBuilder#interceptors(Object...) interceptors(Object...)}
	</ul>
	<li class='jc'>{@link oajr.client2.RestRequest}
	<ul>
		<li class='jm'>{@link oajr.client2.RestRequest#interceptors(RestCallInterceptor...) interceptors(RestCallInterceptor...)}
	</ul>
	<li class='jic'>{@link oajr.client2.RestCallInterceptor}
	<ul>
		<li class='jm'>{@link oajr.client2.RestCallInterceptor#onInit(RestRequest) onInit(RestRequest)}
		<li class='jm'>{@link oajr.client2.RestCallInterceptor#onConnect(RestRequest,RestResponse) onConnect(RestRequest,RestResponse)}
		<li class='jm'>{@link oajr.client2.RestCallInterceptor#onClose(RestRequest,RestResponse) onClose(RestRequest,RestResponse)}
	</ul>
</ul>

<h5 class='section'>Example:</h5>
<p class='bpcode w800'>
	<jc>// Create a client with a customized interceptor.</jc>
	RestClient <jv>client</jv> = RestClient
		.<jsm>create</jsm>()
		.interceptors(
			<jk>new</jk> RestCallInterceptor() {

				<ja>@Override</ja>
				<jk>public void</jk> onInit(RestRequest <jv>req</jv>) <jk>throws</jk> Exception {
					<jc>// Intercept immediately after RestRequest object is created and all headers/query/form-data has been
					// set on the request from the client.</jc>
				}

				<ja>@Override</ja>
				<jk>public void</jk> onConnect(RestRequest <jv>req</jv>, RestResponse <jv>res</jv>) <jk>throws</jk> Exception {
					<jc>// Intercept immediately after an HTTP response has been received.</jc>
				}

				<ja>@Override</ja>
				<jk>public void</jk> onClose(RestRequest <jv>req</jv>, RestResponse <jv>res</jv>) <jk>throws</jk> Exception {
					<jc>// Intercept when the response body is consumed.</jc>
				}
			}
		)
		.build();
</p>