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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
+ * <http://www.apache.org/>.
+ *
+ */
+
+package ch.boye.httpclientandroidlib.protocol;
+
+import java.io.IOException;
+
+import ch.boye.httpclientandroidlib.HttpEntity;
+import ch.boye.httpclientandroidlib.HttpEntityEnclosingRequest;
+import ch.boye.httpclientandroidlib.HttpException;
+import ch.boye.httpclientandroidlib.HttpRequest;
+import ch.boye.httpclientandroidlib.HttpRequestInterceptor;
+import ch.boye.httpclientandroidlib.HttpVersion;
+import ch.boye.httpclientandroidlib.ProtocolException;
+import ch.boye.httpclientandroidlib.ProtocolVersion;
+import ch.boye.httpclientandroidlib.annotation.Immutable;
+import ch.boye.httpclientandroidlib.util.Args;
+
+/**
+ * RequestContent is the most important interceptor for outgoing requests.
+ * It is responsible for delimiting content length by adding
+ * <code>Content-Length</code> or <code>Transfer-Content</code> headers based
+ * on the properties of the enclosed entity and the protocol version.
+ * This interceptor is required for correct functioning of client side protocol
+ * processors.
+ *
+ * @since 4.0
+ */
+@Immutable
+public class RequestContent implements HttpRequestInterceptor {
+
+ private final boolean overwrite;
+
+ /**
+ * Default constructor. The <code>Content-Length</code> or <code>Transfer-Encoding</code>
+ * will cause the interceptor to throw {@link ProtocolException} if already present in the
+ * response message.
+ */
+ public RequestContent() {
+ this(false);
+ }
+
+ /**
+ * Constructor that can be used to fine-tune behavior of this interceptor.
+ *
+ * @param overwrite If set to <code>true</code> the <code>Content-Length</code> and
+ * <code>Transfer-Encoding</code> headers will be created or updated if already present.
+ * If set to <code>false</code> the <code>Content-Length</code> and
+ * <code>Transfer-Encoding</code> headers will cause the interceptor to throw
+ * {@link ProtocolException} if already present in the response message.
+ *
+ * @since 4.2
+ */
+ public RequestContent(final boolean overwrite) {
+ super();
+ this.overwrite = overwrite;
+ }
+
+ public void process(final HttpRequest request, final HttpContext context)
+ throws HttpException, IOException {
+ Args.notNull(request, "HTTP request");
+ if (request instanceof HttpEntityEnclosingRequest) {
+ if (this.overwrite) {
+ request.removeHeaders(HTTP.TRANSFER_ENCODING);
+ request.removeHeaders(HTTP.CONTENT_LEN);
+ } else {
+ if (request.containsHeader(HTTP.TRANSFER_ENCODING)) {
+ throw new ProtocolException("Transfer-encoding header already present");
+ }
+ if (request.containsHeader(HTTP.CONTENT_LEN)) {
+ throw new ProtocolException("Content-Length header already present");
+ }
+ }
+ final ProtocolVersion ver = request.getRequestLine().getProtocolVersion();
+ final HttpEntity entity = ((HttpEntityEnclosingRequest)request).getEntity();
+ if (entity == null) {
+ request.addHeader(HTTP.CONTENT_LEN, "0");
+ return;
+ }
+ // Must specify a transfer encoding or a content length
+ if (entity.isChunked() || entity.getContentLength() < 0) {
+ if (ver.lessEquals(HttpVersion.HTTP_1_0)) {
+ throw new ProtocolException(
+ "Chunked transfer encoding not allowed for " + ver);
+ }
+ request.addHeader(HTTP.TRANSFER_ENCODING, HTTP.CHUNK_CODING);
+ } else {
+ request.addHeader(HTTP.CONTENT_LEN, Long.toString(entity.getContentLength()));
+ }
+ // Specify a content type if known
+ if (entity.getContentType() != null && !request.containsHeader(
+ HTTP.CONTENT_TYPE )) {
+ request.addHeader(entity.getContentType());
+ }
+ // Specify a content encoding if known
+ if (entity.getContentEncoding() != null && !request.containsHeader(
+ HTTP.CONTENT_ENCODING)) {
+ request.addHeader(entity.getContentEncoding());
+ }
+ }
+ }
+
+}