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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
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 *   http://www.apache.org/licenses/LICENSE-2.0
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 * Unless required by applicable law or agreed to in writing,
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 * KIND, either express or implied.  See the License for the
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package org.apache.http.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.ProtocolException;
import org.apache.http.ProtocolVersion;
import org.apache.http.annotation.ThreadingBehavior;
import org.apache.http.annotation.Contract;
import org.apache.http.util.Args;

RequestContent is the most important interceptor for outgoing requests. It is responsible for delimiting content length by adding Content-Length or Transfer-Content 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/**
 * RequestContent is the most important interceptor for outgoing requests.
 * It is responsible for delimiting content length by adding
 * {@code Content-Length} or {@code Transfer-Content} 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
 */
@Contract(threading = ThreadingBehavior.IMMUTABLE)
public class RequestContent implements HttpRequestInterceptor {

    private final boolean overwrite;

    
Default constructor. The Content-Length or Transfer-Encoding will cause the interceptor to throw ProtocolException if already present in the response message. /**
     * Default constructor. The {@code Content-Length} or {@code Transfer-Encoding}
     * 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.
Params:
overwrite – If set to true the Content-Length and Transfer-Encoding headers will be created or updated if already present. If set to false the Content-Length and Transfer-Encoding headers will cause the interceptor to throw ProtocolException if already present in the response message.
Since:
4.2/**
     * Constructor that can be used to fine-tune behavior of this interceptor.
     *
     * @param overwrite If set to {@code true} the {@code Content-Length} and
     * {@code Transfer-Encoding} headers will be created or updated if already present.
     * If set to {@code false} the {@code Content-Length} and
     * {@code Transfer-Encoding} 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;
    }

    @Override
    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());
            }
        }
    }

}