| /* |
| * ==================================================================== |
| * 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 |
| * <http://www.apache.org/>. |
| * |
| */ |
| |
| package org.apache.hc.core5.http.protocol; |
| |
| import java.io.IOException; |
| |
| import org.apache.hc.core5.annotation.Contract; |
| import org.apache.hc.core5.annotation.ThreadingBehavior; |
| import org.apache.hc.core5.http.EntityDetails; |
| import org.apache.hc.core5.http.HeaderElements; |
| import org.apache.hc.core5.http.HttpException; |
| import org.apache.hc.core5.http.HttpHeaders; |
| import org.apache.hc.core5.http.HttpRequest; |
| import org.apache.hc.core5.http.HttpRequestInterceptor; |
| import org.apache.hc.core5.http.HttpVersion; |
| import org.apache.hc.core5.http.ProtocolVersion; |
| import org.apache.hc.core5.util.Args; |
| |
| /** |
| * RequestExpectContinue is responsible for enabling the 'expect-continue' |
| * handshake by adding {@code Expect} header. This interceptor is |
| * recommended for client side protocol processors. |
| * |
| * @since 4.0 |
| */ |
| @Contract(threading = ThreadingBehavior.IMMUTABLE) |
| public class RequestExpectContinue implements HttpRequestInterceptor { |
| |
| public RequestExpectContinue() { |
| super(); |
| } |
| |
| @Override |
| public void process(final HttpRequest request, final EntityDetails entity, final HttpContext context) |
| throws HttpException, IOException { |
| Args.notNull(request, "HTTP request"); |
| |
| if (!request.containsHeader(HttpHeaders.EXPECT)) { |
| if (entity != null) { |
| final ProtocolVersion ver = context.getProtocolVersion(); |
| // Do not send the expect header if request body is known to be empty |
| if (entity.getContentLength() != 0 && !ver.lessEquals(HttpVersion.HTTP_1_0)) { |
| request.addHeader(HttpHeaders.EXPECT, HeaderElements.CONTINUE); |
| } |
| } |
| } |
| } |
| |
| } |