/*******************************************************************************
 * Copyright (c) 2017 IBM Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package com.ibm.liberty.starter.api;

import java.io.IOException;

import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.container.ContainerResponseContext;
import javax.ws.rs.container.ContainerResponseFilter;
import javax.ws.rs.core.MultivaluedMap;

public class CORSFilter implements ContainerResponseFilter {

    @Override
    public void filter(ContainerRequestContext req, ContainerResponseContext res) throws IOException {
        MultivaluedMap<String, String> headers = req.getHeaders();
        headers.add("Access-Control-Allow-Origin", "*");
        headers.add("Access-Control-Allow-Methods", "GET, POST");
        headers.add("Access-Control-Max-Age", "86400");
        headers.add("Access-Control-Allow-Credentials", "true");
        headers.add("Access-Control-Allow-Headers", "Content-Type");
    }

}

Add CORS filter class.