defaultservlet.java

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            pathInfo=(String)request.getAttribute(Dispatcher.__INCLUDE_PATH_INFO);
            if (servletPath==null)
            {
                servletPath=request.getServletPath();
                pathInfo=request.getPathInfo();
            }
        }
        else
        {
            included=Boolean.FALSE;
            servletPath=request.getServletPath();
            pathInfo=request.getPathInfo();
            
            // Is this a range request?
            reqRanges = request.getHeaders(HttpHeaders.RANGE);
            if (reqRanges!=null && !reqRanges.hasMoreElements())
                reqRanges=null;
        }
        
        String pathInContext=URIUtil.addPaths(servletPath,pathInfo);
        boolean endsWithSlash=pathInContext.endsWith(URIUtil.SLASH);
        
        // Can we gzip this request?
        String pathInContextGz=null;
        boolean gzip=false;
        if (!included.booleanValue() && _gzip && reqRanges==null && !endsWithSlash )
        {
            String accept=request.getHeader(HttpHeaders.ACCEPT_ENCODING);
            if (accept!=null && accept.indexOf("gzip")>=0)
                gzip=true;
        }
        
        // Find the resource and content
        Resource resource=null;
        HttpContent content=null;
        
        Connector connector = HttpConnection.getCurrentConnection().getConnector();
        ResourceCache cache=(connector instanceof NIOConnector) ?_nioCache:_bioCache;
        try
        {   
            // Try gzipped content first
            if (gzip)
            {
                pathInContextGz=pathInContext+".gz";  
                resource=getResource(pathInContextGz);

                if (resource==null || !resource.exists()|| resource.isDirectory())
                {
                    gzip=false;
                    pathInContextGz=null;
                }
                else if (cache!=null)
                {
                    content=cache.lookup(pathInContextGz,resource);
                    if (content!=null)
                        resource=content.getResource();
                }

                if (resource==null || !resource.exists()|| resource.isDirectory())
                {
                    gzip=false;
                    pathInContextGz=null;
                }
            }
        
            // find resource
            if (!gzip)
            {
                if (cache==null)
                    resource=getResource(pathInContext);
                else
                {
                    content=cache.lookup(pathInContext,this);

                    if (content!=null)
                        resource=content.getResource();
                    else
                        resource=getResource(pathInContext);
                }
            }
            
            if (Log.isDebugEnabled())
                Log.debug("resource="+resource+(content!=null?" content":""));
                        
            // Handle resource
            if (resource==null || !resource.exists())
                response.sendError(HttpServletResponse.SC_NOT_FOUND);
            else if (!resource.isDirectory())
            {   
                // ensure we have content
                if (content==null)
                    content=new UnCachedContent(resource);
                
                if (included.booleanValue() || passConditionalHeaders(request,response, resource,content))  
                {
                    if (gzip)
                    {
                       response.setHeader(HttpHeaders.CONTENT_ENCODING,"gzip");
                       String mt=_context.getMimeType(pathInContext);
                       if (mt!=null)
                           response.setContentType(mt);
                    }
                    sendData(request,response,included.booleanValue(),resource,content,reqRanges);  
                }
            }
            else
            {
                String welcome=null;
                
                if (!endsWithSlash || (pathInContext.length()==1 && request.getAttribute("org.mortbay.jetty.nullPathInfo")!=null))
                {
                    StringBuffer buf=request.getRequestURL();
                    int param=buf.lastIndexOf(";");
                    if (param<0)
                        buf.append('/');
                    else
                        buf.insert(param,'/');
                    String q=request.getQueryString();
                    if (q!=null&&q.length()!=0)
                    {
                        buf.append('?');
                        buf.append(q);
                    }
                    response.setContentLength(0);
                    response.sendRedirect(response.encodeRedirectURL(buf.toString()));
                }
                // else look for a welcome file
                else if (null!=(welcome=getWelcomeFile(resource)))
                {
                    String ipath=URIUtil.addPaths(pathInContext,welcome);
                    if (_redirectWelcome)
                    {
                        // Redirect to the index
                        response.setContentLength(0);
                        String q=request.getQueryString();
                        if (q!=null&&q.length()!=0)
                            response.sendRedirect(URIUtil.addPaths( _context.getContextPath(),ipath)+"?"+q);
                        else
                            response.sendRedirect(URIUtil.addPaths( _context.getContextPath(),ipath));
                    }
                    else
                    {
                        // Forward to the index
                        RequestDispatcher dispatcher=request.getRequestDispatcher(ipath);
                        if (dispatcher!=null)
                        {
                            if (included.booleanValue())
                                dispatcher.include(request,response);
                            else
                            {
                                request.setAttribute("org.mortbay.jetty.welcome",ipath);
                                dispatcher.forward(request,response);
                            }
                        }
                    }
                }
                else 
                {
                    content=new UnCachedContent(resource);
                    if (included.booleanValue() || passConditionalHeaders(request,response, resource,content))
                        sendDirectory(request,response,resource,pathInContext.length()>1);
                }
            }
        }
        catch(IllegalArgumentException e)
        {
            Log.warn(Log.EXCEPTION,e);
            if(!response.isCommitted())
                response.sendError(500, e.getMessage());
        }
        finally
        {
            if (content!=null)
                content.release();
            else if (resource!=null)
                resource.release();
        }
        
    }
    
    /* ------------------------------------------------------------ */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException
    {
        doGet(request,response);
    }
    
    /* ------------------------------------------------------------ */
    /* (non-Javadoc)
     * @see javax.servlet.http.HttpServlet#doTrace(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     */
    protected void doTrace(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
    {
        resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED);
    }

    /* ------------------------------------------------------------ */
    /**
     * Finds a matching welcome file for the supplied {@link Resource}. This will be the first entry in the list of 
     * configured {@link #_welcomes welcome files} that existing within the directory referenced by the <code>Resource</code>.
     * If the resource is not a directory, or no matching file is found, then it may look for a valid servlet mapping. 
     * If there is none, then <code>null</code> is returned.
     * The list of welcome files is read from the {@link ContextHandler} for this servlet, or
     * <code>"index.jsp" , "index.html"</code> if that is <code>null</code>.
     * @param resource
     * @return The name of the matching welcome file.
     * @throws IOException
     * @throws MalformedURLException
     */
    private String getWelcomeFile(Resource resource) throws MalformedURLException, IOException
    {
        if (!resource.isDirectory() || _welcomes==null)
            return null;

        for (int i=0;i<_welcomes.length;i++)
        {
            Resource welcome=resource.addPath(_welcomes[i]);
            if (welcome.exists())
                return _welcomes[i];
        }
        
        if (_welcomeServlets) 
        {
            ServletHandler servletHandler = (ServletHandler)_context.getContextHandler().getChildHandlerByClass(ServletHandler.class);
            for (int i=0;i<_welcomes.length;i++)
            {
                if (servletHandler.matchesPath(_welcomes[i]))
                    return _welcomes[i];
            }
        }

        return null;
    }

    /* ------------------------------------------------------------ */
    /* Check modification date headers.
     */
    protected boolean passConditionalHeaders(HttpServletRequest request,HttpServletResponse response, Resource resource, HttpContent content)
    throws IOException
    {
        try
        {
            if (!request.getMethod().equals(HttpMethods.HEAD) )
            {
                String ifms=request.getHeader(HttpHeaders.IF_MODIFIED_SINCE);
                if (ifms!=null)
                {
                    if (content!=null)
                    {
                        Buffer mdlm=content.getLastModified();
                        if (mdlm!=null)
                        {
                            if (ifms.equals(mdlm.toString()))
                            {
                                response.reset();
                                response.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
                                response.flushBuffer();
                                return false;
                            }
                        }
                    }
                        
                    long ifmsl=request.getDateHeader(HttpHeaders.IF_MODIFIED_SINCE);
                    if (ifmsl!=-1)
                    {
                        if (resource.lastModified()/1000 <= ifmsl/1000)
                        {
                            response.reset();
                            response.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
                            response.flushBuffer();
                            return false;
                        }
                    }
                }

                // Parse the if[un]modified dates and compare to resource
                long date=request.getDateHeader(HttpHeaders.IF_UNMODIFIED_SINCE);
                
                if (date!=-1)
                {
                    if (resource.lastModified()/1000 > date/1000)
                    {
                        response.sendError(HttpServletResponse.SC_PRECONDITION_FAILED);
                        return false;
                    }
                }
                
            }
        }
        catch(IllegalArgumentException iae)
        {
            if(!response.isCommitted())
                response.sendError(400, iae.getMessage());
            throw iae;
        }
        return true;
    }
    
    
    /* ------------------------------------------------------------------- */
    protected void sendDirectory(HttpServletRequest request,
                                 HttpServletResponse response,
                                 Resource resource,
                                 boolean parent)
    throws IOException
    {
        if (!_dirAllowed)
        {
            response.sendError(HttpServletResponse.SC_FORBIDDEN);
            return;
        }
        
        byte[] data=null;
        String base = URIUtil.addPaths(request.getRequestURI(),URIUtil.SLASH);
        String dir = resource.getListHTML(base,parent);
        if (dir==null)
        {
            response.sendError(HttpServletResponse.SC_FORBIDDEN,
            "No directory");
            return;
        }
        
        data=dir.getBytes("UTF-8");
        response.setContentType("text/html; charset=UTF-8");
        response.setContentLength(data.length);
        response.getOutputStream().write(data);
    }
    
    /* ------------------------------------------------------------ */
    protected void sendData(HttpServletRequest request,