001/*
002 * ====================================================================
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements.  See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership.  The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with the License.  You may obtain a copy of the License at
010 *
011 *   http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing,
014 * software distributed under the License is distributed on an
015 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
016 * KIND, either express or implied.  See the License for the
017 * specific language governing permissions and limitations
018 * under the License.
019 * ====================================================================
020 *
021 * This software consists of voluntary contributions made by many
022 * individuals on behalf of the Apache Software Foundation.  For more
023 * information on the Apache Software Foundation, please see
024 * <http://www.apache.org/>.
025 *
026 */
027
028package org.apache.http.client.protocol;
029
030import java.io.IOException;
031import java.util.Collection;
032
033import org.apache.http.Header;
034import org.apache.http.HttpException;
035import org.apache.http.HttpRequest;
036import org.apache.http.HttpRequestInterceptor;
037import org.apache.http.annotation.Contract;
038import org.apache.http.annotation.ThreadingBehavior;
039import org.apache.http.client.params.ClientPNames;
040import org.apache.http.protocol.HttpContext;
041import org.apache.http.util.Args;
042
043/**
044 * Request interceptor that adds default request headers.
045 *
046 * @since 4.0
047 */
048@SuppressWarnings("deprecation")
049@Contract(threading = ThreadingBehavior.IMMUTABLE_CONDITIONAL)
050public class RequestDefaultHeaders implements HttpRequestInterceptor {
051
052    private final Collection<? extends Header> defaultHeaders;
053
054    /**
055     * @since 4.3
056     */
057    public RequestDefaultHeaders(final Collection<? extends Header> defaultHeaders) {
058        super();
059        this.defaultHeaders = defaultHeaders;
060    }
061
062    public RequestDefaultHeaders() {
063        this(null);
064    }
065
066    @Override
067    public void process(final HttpRequest request, final HttpContext context)
068            throws HttpException, IOException {
069        Args.notNull(request, "HTTP request");
070
071        final String method = request.getRequestLine().getMethod();
072        if (method.equalsIgnoreCase("CONNECT")) {
073            return;
074        }
075
076        // Add default headers
077        @SuppressWarnings("unchecked")
078        Collection<? extends Header> defHeaders = (Collection<? extends Header>)
079            request.getParams().getParameter(ClientPNames.DEFAULT_HEADERS);
080        if (defHeaders == null) {
081            defHeaders = this.defaultHeaders;
082        }
083
084        if (defHeaders != null) {
085            for (final Header defHeader : defHeaders) {
086                request.addHeader(defHeader);
087            }
088        }
089    }
090
091}