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Jersey managed client example.
There is a newer version: 4.0.0-M2
/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
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 *
 * Modifications:
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package org.glassfish.jersey.examples.managedclient;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import javax.ws.rs.container.DynamicFeature;
import javax.ws.rs.container.ResourceInfo;
import javax.ws.rs.core.FeatureContext;

/**
 *Dynamic feature that appends a properly configured {@link CustomHeaderFilter} instance
 * to every method that is annotated with {@link Require @Require} internal feature
 * annotation.
 *
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
public class CustomHeaderFeature implements DynamicFeature {

    /**
     * A method annotation to be placed on those resource methods to which a validating
     * {@link CustomHeaderFilter} instance should be added.
     */
    @Retention(RetentionPolicy.RUNTIME)
    @Documented
    @Target(ElementType.METHOD)
    public static @interface Require {
        /**
         * Expected custom header name to be validated by the {@link CustomHeaderFilter}.
         */
        public String headerName();

        /**
         * Expected custom header value to be validated by the {@link CustomHeaderFilter}.
         */
        public String headerValue();
    }

    @Override
    public void configure(ResourceInfo resourceInfo, FeatureContext context) {
        final Require va = resourceInfo.getResourceMethod().getAnnotation(Require.class);
        if (va != null) {
            context.register(new CustomHeaderFilter(va.headerName(), va.headerValue()));
        }
    }
}