--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/eclipse/jetty/server/handler/ErrorHandler.java	Wed Sep 07 21:15:48 2016 -0600
@@ -0,0 +1,285 @@
+//
+//  ========================================================================
+//  Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
+//  ------------------------------------------------------------------------
+//  All rights reserved. This program and the accompanying materials
+//  are made available under the terms of the Eclipse Public License v1.0
+//  and Apache License v2.0 which accompanies this distribution.
+//
+//      The Eclipse Public License is available at
+//      http://www.eclipse.org/legal/epl-v10.html
+//
+//      The Apache License v2.0 is available at
+//      http://www.opensource.org/licenses/apache2.0.php
+//
+//  You may elect to redistribute this code under either of these licenses.
+//  ========================================================================
+//
+
+package org.eclipse.jetty.server.handler;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.io.StringWriter;
+import java.io.Writer;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.eclipse.jetty.http.HttpHeaders;
+import org.eclipse.jetty.http.HttpMethods;
+import org.eclipse.jetty.http.HttpStatus;
+import org.eclipse.jetty.http.MimeTypes;
+import org.eclipse.jetty.server.AbstractHttpConnection;
+import org.eclipse.jetty.server.Dispatcher;
+import org.eclipse.jetty.server.Request;
+import org.eclipse.jetty.util.ByteArrayISO8859Writer;
+import org.eclipse.jetty.util.log.Log;
+import org.eclipse.jetty.util.log.Logger;
+
+/* ------------------------------------------------------------ */
+/** Handler for Error pages
+ * An ErrorHandler is registered with {@link ContextHandler#setErrorHandler(ErrorHandler)} or 
+ * {@link org.eclipse.jetty.server.Server#addBean(Object)}.   
+ * It is called by the HttpResponse.sendError method to write a error page.
+ * 
+ */
+public class ErrorHandler extends AbstractHandler
+{    
+    private static final Logger LOG = Log.getLogger(ErrorHandler.class);
+    public final static String ERROR_PAGE="org.eclipse.jetty.server.error_page";
+    
+    boolean _showStacks=true;
+    boolean _showMessageInTitle=true;
+    String _cacheControl="must-revalidate,no-cache,no-store";
+    
+    /* ------------------------------------------------------------ */
+    /* 
+     * @see org.eclipse.jetty.server.server.Handler#handle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, int)
+     */
+    public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException
+    {
+        AbstractHttpConnection connection = AbstractHttpConnection.getCurrentConnection();
+        String method = request.getMethod();
+        if(!method.equals(HttpMethods.GET) && !method.equals(HttpMethods.POST) && !method.equals(HttpMethods.HEAD))
+        {
+            connection.getRequest().setHandled(true);
+            return;
+        }
+        
+        if (this instanceof ErrorPageMapper)
+        {
+            String error_page=((ErrorPageMapper)this).getErrorPage(request);
+            if (error_page!=null && request.getServletContext()!=null)
+            {
+                String old_error_page=(String)request.getAttribute(ERROR_PAGE);
+                if (old_error_page==null || !old_error_page.equals(error_page))
+                {
+                    request.setAttribute(ERROR_PAGE, error_page);
+
+                    Dispatcher dispatcher = (Dispatcher) request.getServletContext().getRequestDispatcher(error_page);
+                    try
+                    {
+                        if(dispatcher!=null)
+                        {
+                            dispatcher.error(request, response);
+                            return;
+                        }
+                        LOG.warn("No error page "+error_page);
+                    }
+                    catch (ServletException e)
+                    {
+                        LOG.warn(Log.EXCEPTION, e);
+                        return;
+                    }
+                }
+            }
+        }
+        
+        connection.getRequest().setHandled(true);
+        response.setContentType(MimeTypes.TEXT_HTML_8859_1);    
+        if (_cacheControl!=null)
+            response.setHeader(HttpHeaders.CACHE_CONTROL, _cacheControl);
+        ByteArrayISO8859Writer writer= new ByteArrayISO8859Writer(4096);
+        handleErrorPage(request, writer, connection.getResponse().getStatus(), connection.getResponse().getReason());
+        writer.flush();
+        response.setContentLength(writer.size());
+        writer.writeTo(response.getOutputStream());
+        writer.destroy();
+    }
+
+    /* ------------------------------------------------------------ */
+    protected void handleErrorPage(HttpServletRequest request, Writer writer, int code, String message)
+        throws IOException
+    {
+        writeErrorPage(request, writer, code, message, _showStacks);
+    }
+    
+    /* ------------------------------------------------------------ */
+    protected void writeErrorPage(HttpServletRequest request, Writer writer, int code, String message, boolean showStacks)
+        throws IOException
+    {
+        if (message == null)
+            message=HttpStatus.getMessage(code);
+
+        writer.write("<html>\n<head>\n");
+        writeErrorPageHead(request,writer,code,message);
+        writer.write("</head>\n<body>");
+        writeErrorPageBody(request,writer,code,message,showStacks);
+        writer.write("\n</body>\n</html>\n");
+    }
+
+    /* ------------------------------------------------------------ */
+    protected void writeErrorPageHead(HttpServletRequest request, Writer writer, int code, String message)
+        throws IOException
+        {
+        writer.write("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=ISO-8859-1\"/>\n");
+        writer.write("<title>Error ");
+        writer.write(Integer.toString(code));
+
+        if (_showMessageInTitle)
+        {
+            writer.write(' ');
+            write(writer,message);
+        }
+        writer.write("</title>\n");    
+    }
+
+    /* ------------------------------------------------------------ */
+    protected void writeErrorPageBody(HttpServletRequest request, Writer writer, int code, String message, boolean showStacks)
+        throws IOException
+    {
+        String uri= request.getRequestURI();
+        
+        writeErrorPageMessage(request,writer,code,message,uri);
+        if (showStacks)
+            writeErrorPageStacks(request,writer);
+        writer.write("<hr /><i><small>Powered by Jetty://</small></i>");
+        for (int i= 0; i < 20; i++)
+            writer.write("<br/>                                                \n");
+    }
+
+    /* ------------------------------------------------------------ */
+    protected void writeErrorPageMessage(HttpServletRequest request, Writer writer, int code, String message,String uri)
+    throws IOException
+    {
+        writer.write("<h2>HTTP ERROR ");
+        writer.write(Integer.toString(code));
+        writer.write("</h2>\n<p>Problem accessing ");
+        write(writer,uri);
+        writer.write(". Reason:\n<pre>    ");
+        write(writer,message);
+        writer.write("</pre></p>");
+    }
+
+    /* ------------------------------------------------------------ */
+    protected void writeErrorPageStacks(HttpServletRequest request, Writer writer)
+        throws IOException
+    {
+        Throwable th = (Throwable)request.getAttribute("javax.servlet.error.exception");
+        while(th!=null)
+        {
+            writer.write("<h3>Caused by:</h3><pre>");
+            StringWriter sw = new StringWriter();
+            PrintWriter pw = new PrintWriter(sw);
+            th.printStackTrace(pw);
+            pw.flush();
+            write(writer,sw.getBuffer().toString());
+            writer.write("</pre>\n");
+
+            th =th.getCause();
+        }
+    }
+        
+
+    /* ------------------------------------------------------------ */
+    /** Get the cacheControl.
+     * @return the cacheControl header to set on error responses.
+     */
+    public String getCacheControl()
+    {
+        return _cacheControl;
+    }
+
+    /* ------------------------------------------------------------ */
+    /** Set the cacheControl.
+     * @param cacheControl the cacheControl header to set on error responses.
+     */
+    public void setCacheControl(String cacheControl)
+    {
+        _cacheControl = cacheControl;
+    }
+
+    /* ------------------------------------------------------------ */
+    /**
+     * @return True if stack traces are shown in the error pages
+     */
+    public boolean isShowStacks()
+    {
+        return _showStacks;
+    }
+
+    /* ------------------------------------------------------------ */
+    /**
+     * @param showStacks True if stack traces are shown in the error pages
+     */
+    public void setShowStacks(boolean showStacks)
+    {
+        _showStacks = showStacks;
+    }
+    
+    /* ------------------------------------------------------------ */
+    /**
+     * @param showMessageInTitle if true, the error message appears in page title
+     */
+    public void setShowMessageInTitle(boolean showMessageInTitle)
+    {
+        _showMessageInTitle = showMessageInTitle;
+    }
+    
+    
+    /* ------------------------------------------------------------ */
+    public boolean getShowMessageInTitle()
+    {
+        return _showMessageInTitle;
+    }
+
+    /* ------------------------------------------------------------ */
+    protected void write(Writer writer,String string)
+        throws IOException
+    {
+        if (string==null)
+            return;
+        
+        for (int i=0;i<string.length();i++)
+        {
+            char c=string.charAt(i);
+            
+            switch(c)
+            {
+                case '&' :
+                    writer.write("&amp;");
+                    break;
+                case '<' :
+                    writer.write("&lt;");
+                    break;
+                case '>' :
+                    writer.write("&gt;");
+                    break;
+                    
+                default:
+                    if (Character.isISOControl(c) && !Character.isWhitespace(c))
+                        writer.write('?');
+                    else 
+                        writer.write(c);
+            }          
+        }
+    }
+
+    /* ------------------------------------------------------------ */
+    public interface ErrorPageMapper
+    {
+        String getErrorPage(HttpServletRequest request);
+    }
+}