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Camel HTTP (Apache HttpClient 4.x) support
There is a newer version: 3.0.0-M4
/**
 * 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.
 */
package org.apache.camel.component.http4;

import java.io.IOException;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.camel.Exchange;
import org.apache.camel.ExchangePattern;
import org.apache.camel.component.http4.helper.HttpHelper;
import org.apache.camel.impl.DefaultExchange;

/**
 * @version 
 */
@Deprecated
public class CamelServlet extends HttpServlet {

    private static final long serialVersionUID = -7061982839117697829L;

    private ConcurrentMap consumers = new ConcurrentHashMap();
   
    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        try {

            // Is there a consumer registered for the request.
            HttpConsumer consumer = resolve(request);
            if (consumer == null) {
                response.sendError(HttpServletResponse.SC_NOT_FOUND);
                return;
            }
            
            if (consumer.getEndpoint().getHttpMethodRestrict() != null 
                && !consumer.getEndpoint().getHttpMethodRestrict().equals(request.getMethod())) {
                response.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED);
                return;
            }

            if ("TRACE".equals(request.getMethod()) && !consumer.isTraceEnabled()) {
                response.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED);
                return;
            }
            
            // Have the camel process the HTTP exchange.
            DefaultExchange exchange = new DefaultExchange(consumer.getEndpoint(), ExchangePattern.InOut);
            if (consumer.getEndpoint().isBridgeEndpoint()) {
                exchange.setProperty(Exchange.SKIP_GZIP_ENCODING, Boolean.TRUE);
                exchange.setProperty(Exchange.SKIP_WWW_FORM_URLENCODED, Boolean.TRUE);
            }
            if (consumer.getEndpoint().isDisableStreamCache()) {
                exchange.setProperty(Exchange.DISABLE_HTTP_STREAM_CACHE, Boolean.TRUE);
            }
            HttpHelper.setCharsetFromContentType(request.getContentType(), exchange);
            exchange.setIn(new HttpMessage(exchange, request, response));
            // set context path as header
            String contextPath = consumer.getEndpoint().getPath();
            exchange.getIn().setHeader("CamelServletContextPath", contextPath);

            consumer.getProcessor().process(exchange);

            // now lets output to the response
            consumer.getBinding().writeResponse(exchange, response);

        } catch (Exception e) {
            throw new ServletException(e);
        }
    }

    protected HttpConsumer resolve(HttpServletRequest request) {
        String path = request.getPathInfo();
        if (path == null) {
            return null;
        }
        HttpConsumer answer = consumers.get(path);
               
        if (answer == null) {
            for (String key : consumers.keySet()) {
                if (consumers.get(key).getEndpoint().isMatchOnUriPrefix() && path.startsWith(key)) {
                    answer = consumers.get(key);
                    break;
                }
            }
        }
        return answer;
    }

    public void connect(HttpConsumer consumer) {
        consumers.put(consumer.getPath(), consumer);
    }

    public void disconnect(HttpConsumer consumer) {
        consumers.remove(consumer.getPath());
    }
    
}