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/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * .
 *
 */
package org.apache.http.client.protocol;

import java.io.IOException;
import java.util.List;

import org.apache.http.HttpException;
import org.apache.http.HttpRequest;
import org.apache.http.HttpRequestInterceptor;
import org.apache.http.annotation.Contract;
import org.apache.http.annotation.ThreadingBehavior;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.protocol.HttpContext;

/**
 * Class responsible for handling Content Encoding requests in HTTP.
 * 

* Instances of this class are stateless, therefore they're thread-safe and immutable. * * @see "http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.5" * * @since 4.1 */ @Contract(threading = ThreadingBehavior.IMMUTABLE) public class RequestAcceptEncoding implements HttpRequestInterceptor { private final String acceptEncoding; /** * @since 4.4 */ public RequestAcceptEncoding(final List encodings) { if (encodings != null && !encodings.isEmpty()) { final StringBuilder buf = new StringBuilder(); for (int i = 0; i < encodings.size(); i++) { if (i > 0) { buf.append(","); } buf.append(encodings.get(i)); } this.acceptEncoding = buf.toString(); } else { this.acceptEncoding = "gzip,deflate"; } } public RequestAcceptEncoding() { this(null); } @Override public void process( final HttpRequest request, final HttpContext context) throws HttpException, IOException { final HttpClientContext clientContext = HttpClientContext.adapt(context); final RequestConfig requestConfig = clientContext.getRequestConfig(); /* Signal support for Accept-Encoding transfer encodings. */ if (!request.containsHeader("Accept-Encoding") && requestConfig.isContentCompressionEnabled()) { request.addHeader("Accept-Encoding", acceptEncoding); } } }





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