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/*
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 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
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 * 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,
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 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
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package org.apache.http.client.protocol;

import java.io.IOException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpException;
import org.apache.http.HttpRequest;
import org.apache.http.HttpRequestInterceptor;
import org.apache.http.HttpVersion;
import org.apache.http.ProtocolVersion;
import org.apache.http.annotation.Contract;
import org.apache.http.annotation.ThreadingBehavior;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.protocol.HTTP;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.Args;

/**
 * RequestExpectContinue is responsible for enabling the 'expect-continue'
 * handshake by adding {@code Expect} header.
 * 

* This interceptor takes into account {@link RequestConfig#isExpectContinueEnabled()} * setting. *

* * @since 4.3 */ @Contract(threading = ThreadingBehavior.IMMUTABLE) public class RequestExpectContinue implements HttpRequestInterceptor { public RequestExpectContinue() { super(); } @Override public void process(final HttpRequest request, final HttpContext context) throws HttpException, IOException { Args.notNull(request, "HTTP request"); if (!request.containsHeader(HTTP.EXPECT_DIRECTIVE)) { if (request instanceof HttpEntityEnclosingRequest) { final ProtocolVersion ver = request.getRequestLine().getProtocolVersion(); final HttpEntity entity = ((HttpEntityEnclosingRequest)request).getEntity(); // Do not send the expect header if request body is known to be empty if (entity != null && entity.getContentLength() != 0 && !ver.lessEquals(HttpVersion.HTTP_1_0)) { final HttpClientContext clientContext = HttpClientContext.adapt(context); final RequestConfig config = clientContext.getRequestConfig(); if (config.isExpectContinueEnabled()) { request.addHeader(HTTP.EXPECT_DIRECTIVE, HTTP.EXPECT_CONTINUE); } } } } } }




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