# ServerWorker.java

    /*
     *  Copyright (c) 2009, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
     *
     *  Licensed 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.synapse.transport.passthru;

    import java.io.OutputStream;
    import java.net.InetAddress;
    import java.util.Comparator;
    import java.util.Map;
    import java.util.Set;
    import java.util.TreeMap;

    import javax.net.ssl.SSLPeerUnverifiedException;
    import javax.xml.parsers.FactoryConfigurationError;

    import org.apache.axiom.om.OMAbstractFactory;
    import org.apache.axiom.soap.SOAP11Constants;
    import org.apache.axiom.soap.SOAP12Constants;
    import org.apache.axiom.soap.SOAPEnvelope;
    import org.apache.axiom.soap.SOAPFactory;
    import org.apache.axiom.soap.impl.llom.soap11.SOAP11Factory;
    import org.apache.axiom.util.UIDGenerator;
    import org.apache.axis2.AxisFault;
    import org.apache.axis2.Constants;
    import org.apache.axis2.addressing.EndpointReference;
    import org.apache.axis2.builder.BuilderUtil;
    import org.apache.axis2.context.ConfigurationContext;
    import org.apache.axis2.context.MessageContext;
    import org.apache.axis2.description.AxisService;
    import org.apache.axis2.description.Parameter;
    import org.apache.axis2.dispatchers.RequestURIBasedDispatcher;
    import org.apache.axis2.engine.AxisEngine;
    import org.apache.axis2.transport.RequestResponseTransport;
    import org.apache.axis2.transport.TransportUtils;
    import org.apache.axis2.transport.http.HTTPConstants;
    import org.apache.axis2.transport.http.HTTPTransportUtils;
    import org.apache.axis2.util.MessageContextBuilder;
    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.apache.http.HttpInetConnection;
    import org.apache.http.HttpResponse;
    import org.apache.http.HttpStatus;
    import org.apache.http.HttpVersion;
    import org.apache.http.entity.BasicHttpEntity;
    import org.apache.http.nio.NHttpServerConnection;
    import org.apache.http.nio.reactor.ssl.SSLIOSession;
    import org.apache.http.protocol.HTTP;
    import org.apache.synapse.commons.util.ext.TenantInfoInitiator;
    import org.apache.synapse.commons.util.ext.TenantInfoInitiatorProvider;
    import org.apache.synapse.transport.customlogsetter.CustomLogSetter;
    import org.apache.synapse.transport.http.conn.SynapseDebugInfoHolder;
    import org.apache.synapse.transport.nhttp.HttpCoreRequestResponseTransport;
    import org.apache.synapse.transport.nhttp.NHttpConfiguration;
    import org.apache.synapse.transport.nhttp.NhttpConstants;
    import org.apache.synapse.transport.nhttp.util.NhttpUtil;
    import org.apache.synapse.transport.nhttp.util.RESTUtil;
    import org.apache.synapse.transport.passthru.config.PassThroughConfiguration;
    import org.apache.synapse.transport.passthru.config.SourceConfiguration;
    import org.apache.synapse.transport.passthru.util.SourceResponseFactory;

    /**
     * This is a worker thread for executing an incoming request in to the transport.
     */
    public class ServerWorker implements Runnable {

      	private static final Log log = LogFactory.getLog(ServerWorker.class);
        /** the incoming message to be processed */
        private org.apache.axis2.context.MessageContext msgContext = null;
        /** the http request */
        private SourceRequest request = null;
        /** The configuration of the receiver */
        private SourceConfiguration sourceConfiguration = null;

        private static final String SOAP_ACTION_HEADER = "SOAPAction";

        private static final String HTTP_METHOD = "HTTP_METHOD";

        /** WSDL processor for Get requests */
        private HttpGetRequestProcessor httpGetRequestProcessor = null;

        /** Weather we should do rest dispatching or not */
        private boolean isRestDispatching = true;

        private OutputStream os; //only used for WSDL  requests..

        public ServerWorker(final SourceRequest request,
                            final SourceConfiguration sourceConfiguration,final OutputStream os) {
            this.request = request;
            this.sourceConfiguration = sourceConfiguration;

            this.msgContext = createMessageContext(null, request);

            this.httpGetRequestProcessor = sourceConfiguration.getHttpGetRequestProcessor();

            this.os = os;

            // set these properties to be accessed by the engine
            msgContext.setProperty(
                    PassThroughConstants.PASS_THROUGH_SOURCE_REQUEST, request);
            msgContext.setProperty(
                    PassThroughConstants.PASS_THROUGH_SOURCE_CONFIGURATION, sourceConfiguration);
            msgContext.setProperty(PassThroughConstants.PASS_THROUGH_SOURCE_CONNECTION,
                    request.getConnection());
            msgContext.setProperty(SynapseDebugInfoHolder.SYNAPSE_WIRE_LOG_HOLDER_PROPERTY,
                                   request.getConnection().getContext().getAttribute(SynapseDebugInfoHolder.SYNAPSE_WIRE_LOG_HOLDER_PROPERTY));
            request.getConnection().getContext().setAttribute(NhttpConstants.SERVER_WORKER_INIT_TIME,
                    System.currentTimeMillis());
        }

        public void run() {
            try {
                CustomLogSetter.getInstance().clearThreadLocalContent();
                TenantInfoInitiator tenantInfoInitiator = TenantInfoInitiatorProvider.getTenantInfoInitiator();
                if (tenantInfoInitiator != null) {
                    tenantInfoInitiator.initTenantInfo(request.getUri());
                }
                request.getConnection().getContext().setAttribute(NhttpConstants.SERVER_WORKER_START_TIME, System.currentTimeMillis());
                if (log.isDebugEnabled()) {
                    log.debug("Starting a new Server Worker instance");
                }
                String method =
                        request.getRequest() != null ? request.getRequest().getRequestLine().getMethod().toUpperCase() : "";

                processHttpRequestUri(msgContext, method);

                //For requests to fetch wsdl, return the message flow without going through the normal flow
                if (isRequestToFetchWSDL()) {
                    return;
                }

                //need special case to handle REST
                boolean isRest = isRESTRequest(msgContext, method);

                //should be process normally
                if (!isRest) {
                    if (request.isEntityEnclosing()) {
                        processEntityEnclosingRequest(msgContext, true);
                    } else {
                        processNonEntityEnclosingRESTHandler(null, msgContext, true);
                    }
                } else {
                    String contentTypeHeader = request.getHeaders().get(HTTP.CONTENT_TYPE);
                    SOAPEnvelope soapEnvelope = this.handleRESTUrlPost(contentTypeHeader);
                    processNonEntityEnclosingRESTHandler(soapEnvelope, msgContext, true);
                }

                sendAck(msgContext);
            } finally {
                cleanup();
            }
        }

        private boolean isRequestToFetchWSDL() {
            //if WSDL done then moved out rather than hand over to entity handle methods.
            SourceContext info = (SourceContext) request.getConnection().getContext().
                    getAttribute(SourceContext.CONNECTION_INFORMATION);
            if (info != null && info.getState().equals(ProtocolState.WSDL_RESPONSE_DONE) ||
                (msgContext.getProperty(PassThroughConstants.WSDL_GEN_HANDLED) != null &&
                 Boolean.TRUE.equals((msgContext.getProperty(PassThroughConstants.WSDL_GEN_HANDLED))))) {
                return true;
            }
            return false;
        }

    	/**
    	 * Method will setup the necessary parameters for the rest url post action
    	 *
    	 * @param
    	 * @return
    	 * @throws FactoryConfigurationError
    	 */
    	public SOAPEnvelope handleRESTUrlPost(String contentTypeHdr) throws FactoryConfigurationError {
    	    SOAPEnvelope soapEnvelope = null;
            String contentType = contentTypeHdr != null ? TransportUtils.getContentType(contentTypeHdr, msgContext) : null;
            // When POST request doesn't contain a Content-Type,
            // recipient should consider it as application/octet-stream (rfc2616)
            if (contentType == null || contentType.isEmpty()) {
                contentType = PassThroughConstants.APPLICATION_OCTET_STREAM;
                // Temp fix for https://github.com/wso2/product-ei/issues/2001
                if (HTTPConstants.HTTP_METHOD_GET.equals(msgContext.getProperty(HTTP_METHOD))) {
                    contentType = HTTPConstants.MEDIA_TYPE_X_WWW_FORM;
                }
            }
            if (HTTPConstants.MEDIA_TYPE_X_WWW_FORM.equals(contentType) ||
                    (PassThroughConstants.APPLICATION_OCTET_STREAM.equals(contentType) && contentTypeHdr == null)) {
                msgContext.setTo(new EndpointReference(request.getRequest().getRequestLine().getUri()));
    	        msgContext.setProperty(Constants.Configuration.CONTENT_TYPE,contentType);
    	        String charSetEncoding = BuilderUtil.getCharSetEncoding(contentType);
    		    msgContext.setProperty(Constants.Configuration.CHARACTER_SET_ENCODING, charSetEncoding);
    	        try {
    	            RESTUtil.dispatchAndVerify(msgContext);
    	        } catch (AxisFault e1) {
    	        	log.error("Error while building message for REST_URL request",e1);
    	        }

    			try {
    				/**
    				 * This reverseProxyMode was introduce to avoid the LB exposing
    				 * it's own web service when REST call was initiated
    				 */
    				boolean reverseProxyMode = NHttpConfiguration.getInstance().isReverseProxyMode();
    				AxisService axisService = null;
    				if (!reverseProxyMode) {
    					RequestURIBasedDispatcher requestDispatcher = new RequestURIBasedDispatcher();
    					axisService = requestDispatcher.findService(msgContext);
    				}

    				// the logic determines which service dispatcher to get invoke,
    				// this will be determine
    				// based on parameter defines at disableRestServiceDispatching,
    				// and if super tenant invoke, with isTenantRequest
    				// identifies whether the request to be dispatch to custom REST
    				// Dispatcher Service.

                    boolean isCustomRESTDispatcher = false;
                    String requestURI = request.getRequest().getRequestLine().getUri();
                    if (requestURI.matches(NHttpConfiguration.getInstance().getRestUriApiRegex())
                            || requestURI.matches(NHttpConfiguration.getInstance().getRestUriProxyRegex())) {
                        isCustomRESTDispatcher = true;
                    }

                    if (!isCustomRESTDispatcher) {
                        if (axisService == null) {
                            String defaultSvcName = NHttpConfiguration.getInstance().getNhttpDefaultServiceName();
                            axisService = msgContext.getConfigurationContext().getAxisConfiguration().
                                    getService(defaultSvcName);
                            msgContext.setAxisService(axisService);
                        }
                    } else {
                        String multiTenantDispatchService = PassThroughConfiguration.getInstance().getRESTDispatchService();
                        axisService = msgContext.getConfigurationContext().getAxisConfiguration().getService(multiTenantDispatchService);
                        msgContext.setAxisService(axisService);
                    }
                } catch (AxisFault e) {
    				handleException("Error processing " + request.getMethod() + " request for : " + request.getUri(), e);
    			}

    	        try {
    	        	 soapEnvelope = TransportUtils.createSOAPMessage(msgContext, null, contentType);
    	           } catch (Exception e) {
    	        	log.error("Error while building message for REST_URL request");
    	        }
    	       //msgContext.setProperty(Constants.Configuration.CONTENT_TYPE,"application/xml");
    	       msgContext.setProperty(Constants.Configuration.MESSAGE_TYPE,HTTPConstants.MEDIA_TYPE_APPLICATION_XML);
    	    }
    	    return soapEnvelope;
        }

        public  void sendAck(MessageContext msgContext) {
            String respWritten = "";
            if (msgContext.getOperationContext() != null) {
                respWritten = (String) msgContext.getOperationContext().getProperty(
                        Constants.RESPONSE_WRITTEN);
            }

            if(msgContext.getProperty(PassThroughConstants.FORCE_SOAP_FAULT) != null){
            	respWritten ="SKIP";
            }

            boolean respWillFollow = !Constants.VALUE_TRUE.equals(respWritten)
                    && !"SKIP".equals(respWritten);
            boolean ack = (((RequestResponseTransport) msgContext.getProperty(
                        RequestResponseTransport.TRANSPORT_CONTROL)).getStatus()
                        == RequestResponseTransport.RequestResponseTransportStatus.ACKED);
            boolean forced = msgContext.isPropertyTrue(NhttpConstants.FORCE_SC_ACCEPTED);
            boolean nioAck = msgContext.isPropertyTrue("NIO-ACK-Requested", false);
            if (respWillFollow || ack || forced || nioAck) {
                NHttpServerConnection conn = request.getConnection();
                SourceResponse sourceResponse;
                if (!nioAck) {
                    msgContext.removeProperty(MessageContext.TRANSPORT_HEADERS);
                    sourceResponse = SourceResponseFactory.create(msgContext,
                            request, sourceConfiguration);
                    sourceResponse.setStatus(HttpStatus.SC_ACCEPTED);
                } else {
                    if (log.isDebugEnabled()) {
                        log.debug("Sending ACK response with status "
                                + msgContext.getProperty(NhttpConstants.HTTP_SC)
                                + ", for MessageID : " + msgContext.getMessageID());
                    }
                    sourceResponse = SourceResponseFactory.create(msgContext,
                            request, sourceConfiguration);
                    sourceResponse.setStatus(Integer.parseInt(
                            msgContext.getProperty(NhttpConstants.HTTP_SC).toString()));
                }

                SourceContext.setResponse(conn, sourceResponse);
                ProtocolState state = SourceContext.getState(conn);
                if (state != null && state.compareTo(ProtocolState.REQUEST_DONE) <= 0) {
                    conn.requestOutput();
                } else {
                    SourceContext.updateState(conn, ProtocolState.CLOSED);
                    sourceConfiguration.getSourceConnections().shutDownConnection(conn);
                }
            }
        }

        public void processNonEntityEnclosingRESTHandler(SOAPEnvelope soapEnvelope, MessageContext msgContext, boolean injectToAxis2Engine) {
            String soapAction = request.getHeaders().get(SOAP_ACTION_HEADER);
            if ((soapAction != null) && soapAction.startsWith("\"") && soapAction.endsWith("\"")) {
                soapAction = soapAction.substring(1, soapAction.length() - 1);
            }

            msgContext.setSoapAction(soapAction);
            msgContext.setTo(new EndpointReference(request.getUri()));
            msgContext.setServerSide(true);
            msgContext.setDoingREST(true);
            if (!(request.isEntityEnclosing())) {
            	msgContext.setProperty(PassThroughConstants.NO_ENTITY_BODY, Boolean.TRUE);
            }

            try {
            	if(soapEnvelope == null){
            		 msgContext.setEnvelope(new SOAP11Factory().getDefaultEnvelope());
            	}else{
            		 msgContext.setEnvelope(soapEnvelope);
            	}

                if (injectToAxis2Engine) {
                    AxisEngine.receive(msgContext);
                }
            } catch (AxisFault axisFault) {
                handleException("Error processing " + request.getMethod() +
                    " request for : " + request.getUri(), axisFault);
            } catch (Exception e) {
                handleException(
                        "Error processing " + request.getMethod() + " request for : "
                                + request.getUri() + ". Error detail: " + e.getMessage() + ". ", e);
            }
        }

        public  void processEntityEnclosingRequest(MessageContext msgContext, boolean injectToAxis2Engine) {
            try {
                String contentTypeHeader = request.getHeaders().get(HTTP.CONTENT_TYPE);
                contentTypeHeader = contentTypeHeader != null ? contentTypeHeader : inferContentType();

                String charSetEncoding = null;
                String contentType = null;

    			if (contentTypeHeader != null) {
    				charSetEncoding = BuilderUtil.getCharSetEncoding(contentTypeHeader);
    				contentType = TransportUtils.getContentType(contentTypeHeader, msgContext);
    			}
                // get the contentType of char encoding
                if (charSetEncoding == null) {
                    charSetEncoding = MessageContext.DEFAULT_CHAR_SET_ENCODING;
                }
                String method = request.getRequest() != null ? request.getRequest().getRequestLine().getMethod().toUpperCase():"";

                msgContext.setTo(new EndpointReference(request.getUri()));
                msgContext.setProperty(HTTPConstants.HTTP_METHOD, method);
                msgContext.setProperty(Constants.Configuration.CHARACTER_SET_ENCODING, charSetEncoding);
                msgContext.setServerSide(true);

                msgContext.setProperty(Constants.Configuration.CONTENT_TYPE, contentTypeHeader);
                msgContext.setProperty(Constants.Configuration.MESSAGE_TYPE, contentType);

                if (contentTypeHeader == null || HTTPTransportUtils.isRESTRequest(contentTypeHeader) || isRest(contentTypeHeader)) {
                    msgContext.setProperty(PassThroughConstants.REST_REQUEST_CONTENT_TYPE, contentType);
                    msgContext.setDoingREST(true);
                    SOAPEnvelope soapEnvelope = this.handleRESTUrlPost(contentTypeHeader);
                    msgContext.setProperty(PassThroughConstants.PASS_THROUGH_PIPE, request.getPipe());
                    processNonEntityEnclosingRESTHandler(soapEnvelope, msgContext, injectToAxis2Engine);
        			return;
                } else {
                    String soapAction = request.getHeaders().get(SOAP_ACTION_HEADER);

                    int soapVersion = HTTPTransportUtils.
                            initializeMessageContext(msgContext, soapAction,
                                    request.getUri(), contentTypeHeader);
                    SOAPEnvelope envelope;

                    if (soapVersion == 1) {
                        SOAPFactory fac = OMAbstractFactory.getSOAP11Factory();
                        envelope = fac.getDefaultEnvelope();
                    } else if (soapVersion == 2) {
                        SOAPFactory fac = OMAbstractFactory.getSOAP12Factory();
                        envelope = fac.getDefaultEnvelope();
                    } else {
                        SOAPFactory fac = OMAbstractFactory.getSOAP12Factory();
                        envelope = fac.getDefaultEnvelope();
                    }

                    if ((soapAction != null) && soapAction.startsWith("\"") && soapAction.endsWith("\"")) {
                        soapAction = soapAction.substring(1, soapAction.length() - 1);
                        msgContext.setSoapAction(soapAction);
                    }

                    msgContext.setEnvelope(envelope);
                }

                msgContext.setProperty(PassThroughConstants.PASS_THROUGH_PIPE, request.getPipe());
                if (injectToAxis2Engine) {
                    AxisEngine.receive(msgContext);
                }
            } catch (AxisFault axisFault) {
                handleException("Error processing " + request.getMethod() +
                    " request for : " + request.getUri(), axisFault);
            } catch (Exception e) {
                handleException(
                        "Error processing " + request.getMethod() + " request for : "
                                + request.getUri() + ". Error detail: " + e.getMessage() + ". ", e);
            }
        }

        private boolean isRest(String contentType) {
            return contentType != null &&
                    contentType.indexOf(SOAP11Constants.SOAP_11_CONTENT_TYPE) == -1 &&
                    contentType.indexOf(SOAP12Constants.SOAP_12_CONTENT_TYPE) == -1;
        }

        /**
         * Create an Axis2 message context for the given http request. The request may be in the
         * process of being streamed
         *
         * @param request the http request to be used to create the corresponding Axis2 message context
         * @return the Axis2 message context created
         */
        public MessageContext createMessageContext(MessageContext msgContext, SourceRequest request) {

        	Map excessHeaders = request.getExcessHeaders();
            ConfigurationContext cfgCtx = sourceConfiguration.getConfigurationContext();

            if (msgContext == null) {
                msgContext = new MessageContext();
            }
            msgContext.setMessageID(UIDGenerator.generateURNString());

            // Axis2 spawns a new threads to send a message if this is TRUE - and it has to
            // be the other way
            msgContext.setProperty(MessageContext.CLIENT_API_NON_BLOCKING,
                    Boolean.FALSE);
            msgContext.setConfigurationContext(cfgCtx);

    //        msgContext.setTransportOut(cfgCtx.getAxisConfiguration()
    //                .getTransportOut(Constants.TRANSPORT_HTTP));
    //        msgContext.setTransportIn(cfgCtx.getAxisConfiguration()
    //                .getTransportIn(Constants.TRANSPORT_HTTP));
    //        msgContext.setIncomingTransportName(Constants.TRANSPORT_HTTP);
    //        msgContext.setProperty(Constants.OUT_TRANSPORT_INFO, this);

            NHttpServerConnection conn = request.getConnection();

            if (sourceConfiguration.getScheme().isSSL()) {
                msgContext.setTransportOut(cfgCtx.getAxisConfiguration()
                    .getTransportOut(Constants.TRANSPORT_HTTPS));
                msgContext.setTransportIn(cfgCtx.getAxisConfiguration()
                    .getTransportIn(Constants.TRANSPORT_HTTPS));
    			msgContext.setIncomingTransportName(sourceConfiguration.getInDescription() != null?
    			                                    sourceConfiguration.getInDescription().getName(): Constants.TRANSPORT_HTTPS);

                SSLIOSession ssliosession = (SSLIOSession) (conn.getContext()).getAttribute(SSLIOSession.SESSION_KEY);
                //set SSL certificates to message context if SSLVerifyClient parameter is set
                if (ssliosession != null && msgContext.getTransportIn() != null
                    && msgContext.getTransportIn().getParameter(NhttpConstants.SSL_VERIFY_CLIENT) != null) {
                    try {
                        msgContext.setProperty(NhttpConstants.SSL_CLIENT_AUTH_CERT_X509,
                                               ssliosession.getSSLSession().getPeerCertificateChain());
                    } catch (SSLPeerUnverifiedException e) {
                        //Peer Certificate Chain may not be available always.(in case of Mutual SSL is not enabled)
                        if (log.isTraceEnabled()) {
                            log.trace("Peer certificate chain is not available for MsgContext " + msgContext.getMessageID());
                        }
                    }
                }
            } else {
                msgContext.setTransportOut(cfgCtx.getAxisConfiguration()
                    .getTransportOut(Constants.TRANSPORT_HTTP));
                msgContext.setTransportIn(cfgCtx.getAxisConfiguration()
                    .getTransportIn(Constants.TRANSPORT_HTTP));
                msgContext.setIncomingTransportName(sourceConfiguration.getInDescription() != null?
                                                   	sourceConfiguration.getInDescription().getName(): Constants.TRANSPORT_HTTP);

            }

            msgContext.setProperty(Constants.OUT_TRANSPORT_INFO, this);
            msgContext.setServerSide(true);
            msgContext.setProperty(
                    Constants.Configuration.TRANSPORT_IN_URL, request.getUri());

            // http transport header names are case insensitive
            Map<String, String> headers = new TreeMap<String, String>(new Comparator<String>() {
                public int compare(String o1, String o2) {
                    return o1.compareToIgnoreCase(o2);
                }
            });

            Set<Map.Entry<String, String>> entries = request.getHeaders().entrySet();
            for (Map.Entry<String, String> entry : entries) {
                headers.put(entry.getKey(), entry.getValue());
            }
            msgContext.setProperty(MessageContext.TRANSPORT_HEADERS, headers);
            msgContext.setProperty(NhttpConstants.EXCESS_TRANSPORT_HEADERS, excessHeaders);

            // Following section is required for throttling to work

            if (conn instanceof HttpInetConnection) {
                HttpInetConnection netConn = (HttpInetConnection) conn;
                InetAddress remoteAddress = netConn.getRemoteAddress();
                if (remoteAddress != null) {
                    msgContext.setProperty(
                            MessageContext.REMOTE_ADDR, remoteAddress.getHostAddress());
                    msgContext.setProperty(
                            NhttpConstants.REMOTE_HOST, NhttpUtil.getHostName(remoteAddress));
                }
            }

            msgContext.setProperty(RequestResponseTransport.TRANSPORT_CONTROL,
                    new HttpCoreRequestResponseTransport(msgContext));

            return msgContext;
        }

        private void handleException(String msg, Exception e) {
            if (e == null) {
                log.error(msg);
            } else {
                log.error(msg, e);
            }

            if (e == null) {
                e = new Exception(msg);
            }

            try {
                MessageContext faultContext = MessageContextBuilder
                        .createFaultMessageContext(msgContext, e);
                msgContext.setProperty(PassThroughConstants.FORCE_SOAP_FAULT,
                        Boolean.TRUE);
                AxisEngine.sendFault(faultContext);

            } catch (Exception ex) {
                NHttpServerConnection conn = request.getConnection();
                SourceResponse sourceResponse;
                msgContext.removeProperty(MessageContext.TRANSPORT_HEADERS);
                if (log.isDebugEnabled()) {
                    log.debug("Sending ACK response with status "
                            + msgContext.getProperty(NhttpConstants.HTTP_SC)
                            + ", for MessageID : " + msgContext.getMessageID());
                }
                sourceResponse = SourceResponseFactory.create(msgContext, request,
                        sourceConfiguration);
                sourceResponse.addHeader(HTTP.CONTENT_TYPE, "text/html");
                sourceResponse.setStatus(HttpStatus.SC_INTERNAL_SERVER_ERROR);

                Pipe pipe = new Pipe(sourceConfiguration.getBufferFactory()
                        .getBuffer(), "Test", sourceConfiguration);
                msgContext
                        .setProperty(PassThroughConstants.PASS_THROUGH_PIPE, pipe);
                msgContext.setProperty(
                        PassThroughConstants.MESSAGE_BUILDER_INVOKED, Boolean.TRUE);
                pipe.attachConsumer(conn);
                sourceResponse.connect(pipe);

                OutputStream os = pipe.getOutputStream();

                try {
                    String body = "<html><body><h1>"
                            + "Failed to process the request" + "</h1><p>" + msg
                            + "</p>";
                    if (e != null) {
                        body = body + "<p>" + e.getMessage() + "</p></body></html>";
                    }
                    if (ex != null) {
                        body = body + "<p>" + ex.getMessage()
                                + "</p></body></html>";
                    }
                    os.write(body.getBytes());
                    os.flush();
                    os.close();
                } catch (Exception ignore) {
                }

                pipe.setSerializationCompleteWithoutData(true);

                SourceContext.setResponse(conn, sourceResponse);
                ProtocolState state = SourceContext.getState(conn);
                if (state != null
                        && state.compareTo(ProtocolState.REQUEST_DONE) <= 0) {
                    conn.requestOutput();
                } else {
                    SourceContext.updateState(conn, ProtocolState.CLOSED);
                    sourceConfiguration.getSourceConnections().shutDownConnection(
                            conn,true);
                }

            }
        }

        private String inferContentType() {
            Map<String, String> headers = request.getHeaders();
            for (String header : headers.keySet()) {
                if (HTTP.CONTENT_TYPE.equalsIgnoreCase(header)) {
                    return headers.get(header);
                }
            }
            Parameter param = sourceConfiguration.getConfigurationContext().getAxisConfiguration().
                    getParameter(PassThroughConstants.REQUEST_CONTENT_TYPE);
            if (param != null) {
                return param.getValue().toString();
            }
            return null;
        }

        protected MessageContext getRequestContext() {
            return msgContext;
        }

        /**
         * @return Get SourceRequest Processed by ServerWorker
         */
        public SourceRequest getSourceRequest() {
            return request;
        }

        /**
         * @param request Set SourceRequest to be processed by ServerWorker
         */
        public void setSourceRequest(SourceRequest request) {
            this.request = request;
        }

        /**
         * Adding REST related properties to the message context if request is  REST
         * @param msgContext Axis2MessageContext of the request
         * @param method HTTP Method of the request
         * @return whether request is REST or SOAP
         */
        public boolean isRESTRequest(MessageContext msgContext, String method){
            if(msgContext.getProperty
                    (PassThroughConstants.REST_GET_DELETE_INVOKE) != null && (Boolean)msgContext.getProperty
                                                                             (PassThroughConstants.REST_GET_DELETE_INVOKE)){
                msgContext.setProperty(HTTPConstants.HTTP_METHOD, method);
                msgContext.setServerSide(true);
                msgContext.setDoingREST(true);
                return true;
            }
            return false;
        }

        /**
         * Get Uri of underlying SourceRequest and  calculate service prefix and add to message context
         * create response buffers for  HTTP GET, DELETE, OPTION and HEAD methods
         * @param msgContext Axis2MessageContext of the request
         * @param method HTTP Method of the request
         */
        public void processHttpRequestUri(MessageContext msgContext, String method){
            String servicePrefixIndex="://";
            ConfigurationContext cfgCtx = sourceConfiguration.getConfigurationContext();
            msgContext.setProperty(Constants.Configuration.HTTP_METHOD, request.getMethod());

            //String uri = request.getUri();
            String oriUri = request.getUri();
            String restUrlPostfix = NhttpUtil.getRestUrlPostfix(oriUri, cfgCtx.getServicePath());

            String servicePrefix = oriUri.substring(0, oriUri.indexOf(restUrlPostfix));
            if (servicePrefix.indexOf(servicePrefixIndex) == -1) {
                HttpInetConnection inetConn = (HttpInetConnection) request.getConnection();
                InetAddress localAddr = inetConn.getLocalAddress();
                if (localAddr != null) {
                    servicePrefix = sourceConfiguration.getScheme().getName() + servicePrefixIndex +
                            localAddr.getHostAddress() + ":" + inetConn.getLocalPort() + servicePrefix;
                }
            }

            msgContext.setProperty(PassThroughConstants.SERVICE_PREFIX, servicePrefix);
            msgContext.setTo(new EndpointReference(restUrlPostfix));
            msgContext.setProperty(PassThroughConstants.REST_URL_POSTFIX, restUrlPostfix);

            if (PassThroughConstants.HTTP_GET.equals(method) ||  PassThroughConstants.HTTP_HEAD.equals(method)||
                    PassThroughConstants.HTTP_OPTIONS.equals(method)) {
                HttpResponse response = sourceConfiguration.getResponseFactory().newHttpResponse(
                        request.getVersion(), HttpStatus.SC_OK,
                        request.getConnection().getContext());

                // create a basic HttpEntity using the source channel of the response pipe
                BasicHttpEntity entity = new BasicHttpEntity();
                if (request.getVersion().greaterEquals(HttpVersion.HTTP_1_1)) {
                    entity.setChunked(true);
                }
                response.setEntity(entity);

                httpGetRequestProcessor.process(request.getRequest(), response,msgContext,
                        request.getConnection(), os, isRestDispatching);
            }
        }

        /**
         * Get the shared pass-through source configuration
         * @return source configuration
         */
        public SourceConfiguration getSourceConfiguration() {
            return sourceConfiguration;
        }

        /**
         * Perform cleanup of ServerWorker
         */
        private void cleanup () {
            //clean threadLocal variables
            MessageContext.destroyCurrentMessageContext();
            //clean tenantInfo
            TenantInfoInitiator tenantInfoInitiator = TenantInfoInitiatorProvider.getTenantInfoInitiator();
            if (tenantInfoInitiator != null) {
                tenantInfoInitiator.cleanTenantInfo();
            }

        }

    }