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Async Http Client library purpose is to allow Java applications to easily execute HTTP requests and asynchronously process the HTTP responses.

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/*
 * Copyright (c) 2010-2012 Sonatype, Inc. All rights reserved.
 *
 * This program is licensed to you under the Apache License Version 2.0,
 * and you may not use this file except in compliance with the Apache License Version 2.0.
 * You may obtain a copy of the Apache License Version 2.0 at http://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the Apache License Version 2.0 is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
 */
package com.ning.http.client.providers.jdk;

import com.ning.http.client.AsyncHttpProvider;
import com.ning.http.client.FluentCaseInsensitiveStringsMap;
import com.ning.http.client.HttpResponseHeaders;
import com.ning.http.client.uri.Uri;

import java.net.HttpURLConnection;
import java.util.List;
import java.util.Map;

/**
 * A class that represent the HTTP headers.
 */
public class ResponseHeaders extends HttpResponseHeaders {

    private final FluentCaseInsensitiveStringsMap headers;

    public ResponseHeaders(Uri uri, HttpURLConnection urlConnection, AsyncHttpProvider provider) {
        headers = computerHeaders(urlConnection);
    }

    private FluentCaseInsensitiveStringsMap computerHeaders(HttpURLConnection urlConnection) {
        FluentCaseInsensitiveStringsMap h = new FluentCaseInsensitiveStringsMap();

        Map> uh = urlConnection.getHeaderFields();

        for (Map.Entry> e : uh.entrySet()) {
            if (e.getKey() != null) {
                h.add(e.getKey(), e.getValue());
            }
        }
        return h;
    }

    /**
     * Return the HTTP header
     *
     * @return an {@link com.ning.http.client.FluentCaseInsensitiveStringsMap}
     */
    @Override
    public FluentCaseInsensitiveStringsMap getHeaders() {
        return headers;
    }
}