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/*
* 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.myfaces.trinidad.webapp;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.InterruptedIOException;
import java.io.OutputStream;
import java.io.Reader;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.net.SocketException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import javax.faces.FacesException;
import javax.faces.FactoryFinder;
import javax.faces.application.ProjectStage;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.faces.context.FacesContextFactory;
import javax.faces.event.PhaseListener;
import javax.faces.lifecycle.Lifecycle;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.myfaces.trinidad.config.Configurator;
import org.apache.myfaces.trinidad.logging.TrinidadLogger;
import org.apache.myfaces.trinidad.resource.CachingResourceLoader;
import org.apache.myfaces.trinidad.resource.DirectoryResourceLoader;
import org.apache.myfaces.trinidad.resource.ResourceLoader;
import org.apache.myfaces.trinidad.resource.ServletContextResourceLoader;
import org.apache.myfaces.trinidad.util.URLUtils;
/**
* A Servlet which serves up web application resources (images, style sheets,
* JavaScript libraries) by delegating to a ResourceLoader.
*
* The servlet path at which this servlet is registered is used to lookup the
* class name of the resource loader implementation.
* For example, if this servlet is registered with name "resources" and
* URL pattern "/images/*", then its servlet path is "/images". This is used
* to construct the class loader lookup for the text file
* "/META-INF/servlets/resources/images.resources" which contains a single line entry
* with the class name of the resource loader to use. This technique is very
* similar to "/META-INF/services" lookup that allows the implementation object
* to implement an interface in the public API and be used by the public API
* but reside in a private implementation JAR.
*/
// TODO use ClassLoader.getResources() and make hierarchical
// TODO verify request headers and (cached) response headers
// TODO set "private" cache headers in debug mode?
public class ResourceServlet extends HttpServlet
{
/**
*
*/
@SuppressWarnings("compatibility:8282627001212629976")
private static final long serialVersionUID = 4547362994406585148L;
/**
* Override of Servlet.destroy();
*/
@Override
public void destroy()
{
_loaders = null;
_loaderErrors = null;
_facesContextFactory = null;
_lifecycle = null;
super.destroy();
}
/**
* Override of Servlet.init();
*/
@Override
public void init(
ServletConfig config
) throws ServletException
{
super.init(config);
// Acquire our FacesContextFactory instance
try
{
_facesContextFactory = (FacesContextFactory)
FactoryFinder.getFactory
(FactoryFinder.FACES_CONTEXT_FACTORY);
}
catch (FacesException e)
{
Throwable rootCause = e.getCause();
if (rootCause == null)
{
throw e;
}
else
{
throw new ServletException(e.getMessage(), rootCause);
}
}
// Acquire our Lifecycle instance
_lifecycle = new _ResourceLifecycle();
_initDebug(config);
_loaders = new ConcurrentHashMap();
_loaderErrors = new ConcurrentHashMap>();
}
@Override
public void service(
ServletRequest request,
ServletResponse response
) throws ServletException, IOException
{
boolean hasFacesContext = false;
FacesContext context = FacesContext.getCurrentInstance();
// If we happen to invoke the ResourceServlet *via* the
// FacesServlet, you get a lot of fun from the recursive
// attempt to create a FacesContext. Developers should not
// do this, but it's easy to check
if (context != null)
{
// Additional _isContextValid check on the context to workaround Mojarra issues like this one...
// https://java.net/jira/browse/JAVASERVERFACES-2533
if (_isContextValid(context))
{
hasFacesContext = true;
}
else
{
// clean up the invalid context before we try to create one
context.release();
}
}
if (!hasFacesContext)
{
Configurator.disableConfiguratorServices(request);
//=-= Scott O'Bryan =-=
// Be careful. This can be wrapped by other things even though it's meant to be a
// Trinidad only resource call.
context = _facesContextFactory.getFacesContext(getServletContext(), request, response, _lifecycle);
}
try
{
super.service(request, response);
}
catch (ServletException e)
{
_logServiceException(e, request);
throw e;
}
catch (IOException e)
{
if (!_canIgnore(e))
_logServiceException(e, request);
throw e;
}
catch (RuntimeException e)
{
_logServiceException(e, request);
throw e;
}
catch (Error e)
{
_logServiceException(e, request);
throw e;
}
finally
{
// cleanup the context we created for serving this request
if (!hasFacesContext)
context.release();
}
}
/**
* Override of HttpServlet.doGet()
*/
@Override
protected void doGet(
HttpServletRequest request,
HttpServletResponse response
) throws ServletException, IOException
{
ResourceLoader loader = _getResourceLoader(request);
String resourcePath = getResourcePath(request);
URL url = loader.getResource(resourcePath);
// Make sure the resource is available
if (url == null)
{
_logURLNotFound(request, loader, resourcePath);
response.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
// Stream the resource contents to the servlet response
URLConnection connection = url.openConnection();
connection.setDoInput(true);
connection.setDoOutput(false);
//We need to do a connect here. Some connections, like file connections and
//whatnot may have header information right away. Other connections, like
//to external resources, will not have been able to connect until this is called.
//The reason this worked before is the getInputStream implicitly called the
//connect, but the header information which was returned would before the stream
//was obtained would not be avialble.
connection.connect();
_setHeaders(connection, response, loader);
InputStream in = connection.getInputStream();
OutputStream out = response.getOutputStream();
byte[] buffer = new byte[_BUFFER_SIZE];
try
{
_pipeBytes(in, out, buffer);
}
finally
{
try
{
in.close();
}
finally
{
out.close();
}
}
}
/**
* Override of HttpServlet.getLastModified()
*/
@Override
protected long getLastModified(
HttpServletRequest request)
{
try
{
ResourceLoader loader = _getResourceLoader(request);
String resourcePath = getResourcePath(request);
URL url = loader.getResource(resourcePath);
if (url == null)
return super.getLastModified(request);
return URLUtils.getLastModified(url);
}
catch (IOException e)
{
// Note: API problem with HttpServlet.getLastModified()
// should throw ServletException, IOException
return super.getLastModified(request);
}
}
/**
* Returns the resource path from the http servlet request.
*
* @param request the http servlet request
*
* @return the resource path
*/
protected String getResourcePath(
HttpServletRequest request)
{
return request.getServletPath() + request.getPathInfo();
}
/**
* Checks if the faces context that we have is valid for this request
*/
private boolean _isContextValid(FacesContext context)
{
ExternalContext ec = context.getExternalContext();
// a bogus context would not have a request object
return ((ec != null) && (ec.getRequest() != null));
}
/**
* Returns the resource loader for the requested servlet path.
*/
private ResourceLoader _getResourceLoader(
String servletPath)
{
ResourceLoader loader = null;
try
{
String key = "META-INF/servlets/resources" +
servletPath +
".resources";
ClassLoader cl = Thread.currentThread().getContextClassLoader();
URL url = cl.getResource(key);
if (url != null)
{
Reader r = new InputStreamReader(url.openStream());
BufferedReader br = new BufferedReader(r);
try
{
String className = br.readLine();
if (className != null)
{
className = className.trim();
Class clazz = cl.loadClass(className);
try
{
// check if this is a decorator first, and if not, fall back to the no-arg constructor.
Constructor decorator = clazz.getConstructor(_DECORATOR_SIGNATURE);
ServletContext context = getServletContext();
File tempdir = (File)
context.getAttribute("javax.servlet.context.tempdir");
ResourceLoader delegate = new DirectoryResourceLoader(tempdir);
loader = (ResourceLoader) decorator.newInstance(new Object[]{delegate});
}
catch (InvocationTargetException e)
{
// by default, create new instance with no-args constructor
_logLoaderException(e, servletPath);
loader = (ResourceLoader) clazz.newInstance();
}
catch (NoSuchMethodException e)
{
// by default, create new instance with no-args constructor
loader = (ResourceLoader) clazz.newInstance();
}
}
}
finally
{
br.close();
}
}
else
{
// default to serving resources from the servlet context
if (_LOG.isWarning())
{
_LOG.warning("Unable to find ResourceLoader for ResourceServlet" +
" at servlet path:{0}" +
"\nCause: Could not find resource:{1}",
new Object[] {servletPath, key});
}
loader = new ServletContextResourceLoader(getServletContext())
{
@Override
public URL getResource(
String path) throws IOException
{
return super.getResource(path);
}
};
}
// Enable resource caching, but only if we aren't debugging
if (!_debug && loader.isCachable())
{
loader = new CachingResourceLoader(loader);
}
}
catch (IllegalAccessException e)
{
loader = logExceptionAndReturnFailureLoader(e, servletPath);
}
catch (InstantiationException e)
{
loader = logExceptionAndReturnFailureLoader(e, servletPath);
}
catch (ClassNotFoundException e)
{
loader = logExceptionAndReturnFailureLoader(e, servletPath);
}
catch (IOException e)
{
loader = logExceptionAndReturnFailureLoader(e, servletPath);
}
return loader;
}
/**
* Get the servlet path from the request and see if we've already cached the resource loader for this path.
* If not, call _getResourceLoader(String servletPath) to find it.
*
* @param request
* @return
*/
private ResourceLoader _getResourceLoader(
HttpServletRequest request)
{
final String servletPath = request.getServletPath();
ResourceLoader loader = _loaders.get(servletPath);
if (loader == null)
{
loader = _getResourceLoader(servletPath);
// add the new loader to the loader cache
_registerLoader(servletPath, loader);
}
return loader;
}
/**
* Add the loader to the loader map
* @param servletPath
* @param loader
*/
private void _registerLoader(String servletPath, ResourceLoader loader)
{
_loaders.put(servletPath, loader);
}
/*
* exception logger for _getResourceLoader() that will only log one error for multiple failures of the same servlet
*/
private void _logLoaderException(Exception e, String servletPath)
{
Class previousExceptionClass = _loaderErrors.get(servletPath);
// if we haven't logged an error for this servletPath, or the exception class differs, log an error
if (previousExceptionClass == null || previousExceptionClass != e.getClass())
{
_LOG.severe(e);
if (e.getCause() != null)
_LOG.severe("Caused by ", e.getCause());
_loaderErrors.put(servletPath, e.getClass());
}
}
/**
* Method to log a warning message with helpful details when we fail to find a URL.
*
* @param request
* @param loader
* @param resourcePath
*/
private void _logURLNotFound(HttpServletRequest request,
ResourceLoader loader,
String resourcePath)
{
// log some details on the failure
if (_LOG.isWarning())
{
FacesContext context = FacesContext.getCurrentInstance();
Object servletContext = _getServletContextFromFacesContext(context);
_LOG.warning("URL for resource not found.\n"+
" resourcePath: {0}\n"+
" loader class name: {1}\n"+
" request.pathTranslated: {2}\n"+
" request.requestURL: {3}\n"+
" FacesContext: {4}\n" +
" ServletContext: {5}\n",
new Object[] { resourcePath,
loader,
request.getPathTranslated(),
request.getRequestURL(),
context,
servletContext});
}
}
/**
* Method to log a severe error when we get an exception in the .service() method.
*
* @param e
* @param request
*/
private void _logServiceException(Throwable e, ServletRequest request)
{
// log some details on the service exception
FacesContext context = FacesContext.getCurrentInstance();
Object servletContext = _getServletContextFromFacesContext(context);
HttpServletRequest sr = (HttpServletRequest) request;
_LOG.severe("An Exception occured in ResourceServlet.service().\n"+
" request.pathTranslated:" + sr.getPathTranslated() + "\n" +
" request.requestURI:" + sr.getRequestURI() + "\n" +
" FacesContext: " + context + "\n" +
" ServletContext: " + servletContext + "\n",
e);
}
/**
*Returns the servlet context object from the FacesContext
*
* @param context
* @return
*/
private Object _getServletContextFromFacesContext(FacesContext context)
{
ExternalContext ec = null;
Object sc = null;
if (context != null)
{
ec = context.getExternalContext();
if (ec != null)
{
sc = ec.getContext();
}
}
return sc;
}
/**
* Reads the specified input stream into the provided byte array storage and
* writes it to the output stream.
*/
private static void _pipeBytes(
InputStream in,
OutputStream out,
byte[] buffer
) throws IOException
{
int length;
while ((length = (in.read(buffer))) >= 0)
{
out.write(buffer, 0, length);
}
}
/**
* Initialize whether resource debug mode is enabled.
*/
private void _initDebug(
ServletConfig config
)
{
String debug = config.getInitParameter(DEBUG_INIT_PARAM);
if (debug == null)
{
// Check for a context init parameter if servlet init
// parameter isn't set
debug = config.getServletContext().getInitParameter(DEBUG_INIT_PARAM);
}
// private call to get the used JSF 2.0 ProjectStage as we don't have
// access to the FacesContext object here...
ProjectStage currentStage = _getFacesProjectStage(config.getServletContext());
if (debug != null)
{
_debug = "true".equalsIgnoreCase(debug);
}
else
{
// if the DDEBUG_INIT_PARAM parameter has NOT been specified, let us
// apply the DEFAULT values for the certain Project Stages:
// -PRODUCTION we want this value to be FALSE;
// -other stages we use TRUE
_debug = !(ProjectStage.Production.equals(currentStage));
}
if (_debug)
{
// If DEBUG_INIT_PARAM is TRUE on Production-Stage, we
// generate a WARNING msg
if (ProjectStage.Production.equals(currentStage))
{
_LOG.warning("RESOURCESERVLET_IN_DEBUG_MODE",DEBUG_INIT_PARAM);
}
else
{
_LOG.info("RESOURCESERVLET_IN_DEBUG_MODE",DEBUG_INIT_PARAM);
}
}
}
/**
* private version of the Application.getProjectStage(). See the
* original JavaDoc for a description of the underlying algorithm.
*
* It is written as we do not have access to the FacesContext object at the point
* of executing this method.
*
* This code comes from the Apache MyFaces 2.0 implementation.
*/
private ProjectStage _getFacesProjectStage(ServletContext servletContext)
{
if (_projectStage == null)
{
String stageName = null;
// Look for a JNDI environment entry under the key given by the
// value of ProjectStage.PROJECT_STAGE_JNDI_NAME (a String)
try
{
Context ctx = new InitialContext();
Object temp = ctx.lookup(ProjectStage.PROJECT_STAGE_JNDI_NAME);
if (temp != null)
{
if (temp instanceof String)
{
stageName = (String) temp;
}
else
{
if (_LOG.isSevere())
{
_LOG.severe("Invalid JNDI lookup for key " + ProjectStage.PROJECT_STAGE_JNDI_NAME);
}
}
}
}
catch (NamingException e)
{
// no-op we need to ignore this...
}
/*
* If found, continue with the algorithm below, otherwise, look for an entry in the initParamMap of the
* ExternalContext from the current FacesContext with the key ProjectStage.PROJECT_STAGE_PARAM_NAME
*/
if (stageName == null)
{
stageName = servletContext.getInitParameter(ProjectStage.PROJECT_STAGE_PARAM_NAME);
}
// If a value is found found
if (stageName != null)
{
/*
* see if an enum constant can be obtained by calling ProjectStage.valueOf(), passing the value from the
* initParamMap. If this succeeds without exception, save the value and return it.
*/
try
{
_projectStage = ProjectStage.valueOf(stageName);
return _projectStage;
}
catch (IllegalArgumentException e)
{
_LOG.severe("Couldn't discover the current project stage", e);
}
}
else
{
if (_LOG.isInfo())
{
_LOG.info("Couldn't discover the current project stage, using " + ProjectStage.Production);
}
}
/*
* If not found, or any of the previous attempts to discover the enum constant value have failed, log a
* descriptive error message, assign the value as ProjectStage.Production and return it.
*/
_projectStage = ProjectStage.Production;
}
return _projectStage;
}
/**
* Sets HTTP headers on the response which tell
* the browser to cache the resource indefinitely.
*/
private void _setHeaders(
URLConnection connection,
HttpServletResponse response,
ResourceLoader loader)
{
String resourcePath;
URL url;
String contentType = ResourceLoader.getContentType(loader, connection);
if (contentType == null || "content/unknown".equals(contentType))
{
url = connection.getURL();
resourcePath = url.getPath();
// 'Case' statement for unknown content types
if (resourcePath.endsWith(".css"))
contentType = "text/css";
else if (resourcePath.endsWith(".js"))
contentType = "application/x-javascript";
else if (resourcePath.endsWith(".cur") || resourcePath.endsWith(".ico"))
contentType = "image/vnd.microsoft.icon";
else
contentType = getServletContext().getMimeType(resourcePath);
// The resource has an file extension we have not
// included in the case statement above
if (contentType == null)
{
_LOG.warning("ResourceServlet._setHeaders(): " +
"Content type for {0} is NULL!\n" +
"Cause: Unknown file extension",
resourcePath);
}
}
if (contentType != null)
{
response.setContentType(contentType);
int contentLength = connection.getContentLength();
if (contentLength >= 0)
response.setContentLength(contentLength);
}
long lastModified;
try
{
lastModified = URLUtils.getLastModified(connection);
}
catch (IOException exception)
{
lastModified = 0;
}
if (lastModified == 0)
response.setDateHeader("Last-Modified", lastModified);
//Handle cache controls. So this is a bit complex and confusing. If
//either of the cache headers are provide AND we are not in debug mode
//then we should set the cache to a default value. This is to maintain
//backward compatibility. If, however, the expiration or cache control
//headers are provided, we should just use those.
String cacheControl = connection.getHeaderField("cache-control");
Long expires = connection.getExpiration();
if (!_debug && null == cacheControl && 0 == expires)
{
// We set two headers: Cache-Control and Expires.
// This combination lets browsers know that it is
// okay to cache the resource indefinitely.
// Set Cache-Control to "Public".
cacheControl = "Public";
expires = System.currentTimeMillis() + ONE_YEAR_MILLIS;
}
if(null != cacheControl)
{
response.setHeader("Cache-Control", cacheControl);
}
if(0 != expires)
{
response.setDateHeader("Expires", expires);
}
Map> headerMap = connection.getHeaderFields();
if(null != headerMap) //There are some wonkey impl's out there, best to guard against null
{
//put additional headers
for(Map.Entry> entry: connection.getHeaderFields().entrySet())
{
//We handled a number of headers above and there are others we might want
//to exclude. We test for those headers here.
String key = entry.getKey();
if(Arrays.binarySearch(_INCLUDED_HEADERS, key.toLowerCase()) >= 0 && null != entry.getValue())
{
//Header is not excluded, add all the entries
for(String value:entry.getValue())
{
response.addHeader(key, value);
}
}
}
}
}
private static boolean _canIgnore(Throwable t)
{
if (t instanceof InterruptedIOException)
{
// All "interrupted" IO is not notable
return true;
}
else if (t instanceof SocketException)
{
// And any sort of SocketException should also be
// ignored (Internet Explorer is a prime source of these,
// as it doesn't try to close down sockets properly
// when a user cancels)
return true;
}
else if (t instanceof IOException)
{
String message = t.getMessage();
// Check for "Broken pipe" and "connection was aborted"/
// "connection abort" messages
if ((message != null) &&
((message.indexOf("Broken pipe") >= 0) ||
(message.indexOf("abort") >= 0)))
return true;
}
return false;
}
/**
* Instead of calling ResourceLoader.getNullResourceLoader(), we want to return our own version which will
* periodically attempt to get the real resource loader and start using that instead.
*/
private ResourceLoader logExceptionAndReturnFailureLoader(Exception e, String servletPath)
{
_logLoaderException(e, servletPath);
return new _ExponentialBackoffResourceLoader(servletPath);
}
/**
* The _ExponentialBackOffResourceLoader is a private class to be used in place of the resource loader returned by
* ResourceLoader.getNullResourceLoader(). We want to initially start out with a wait time of 10 miliseconds before
* we attempt to get the correct resource loader. We'll double the wait time for every attempt, until the wait time
* is longer than a minute. At that point, we will still keep trying but no longer double the wait time.
*/
private final class _ExponentialBackoffResourceLoader extends ResourceLoader
{
/**
* Constructs a new repairing resource loader.
*/
protected _ExponentialBackoffResourceLoader(String servletPath)
{
super(null);
// Set the timestamp for this request
_initialTimeStamp = System.currentTimeMillis();
_nextBackoffTime = _initialTimeStamp + _INITIAL_WAIT_TIME;
_servletPath = servletPath;
}
@Override
protected URL findResource(
String name
) throws IOException
{
long currentTime = System.currentTimeMillis();
// If we have waited the current wait time, we need to try again.
if (currentTime > _nextBackoffTime)
{
synchronized(this)
{
// We need to check this again, just in case a different thread already updated the value
// If another thread updated the value, we don't need try to get the resource loader or
// update the backoff time
if (currentTime > _nextBackoffTime)
{
ResourceLoader newLoader = _getResourceLoader(_servletPath);
if (!(newLoader instanceof _ExponentialBackoffResourceLoader))
{
// We got a real resource loader, lets repair ourself by updating the loader cache.
_registerLoader(_servletPath, newLoader);
//Log a message
_LOG.warning("Fixed resource loader for servlet path: {0}", _servletPath);
return newLoader.getResource(name);
}
// No new loader found, update the next backoff time.
// this doesn't produce an exact doubling of the _INITIAL_WAIT_TIME, but we really don't need to
// be exact here, as long as we reach the max wait time
_nextBackoffTime += Math.min((currentTime - _initialTimeStamp) * 2, _MAX_WAIT_TIME);
}
}
}
// We haven't waited long enough, just return null.
return null;
}
private volatile long _nextBackoffTime; // The number of miliseconds to wait before trying again.
private final long _initialTimeStamp; // The timestamp of the last failed attempt to get the resource loader
private final String _servletPath;
}
static private class _ResourceLifecycle extends Lifecycle
{
@Override
public void execute(FacesContext p0) throws FacesException
{
}
@Override
public PhaseListener[] getPhaseListeners()
{
return null;
}
@Override
public void removePhaseListener(PhaseListener p0)
{
}
@Override
public void render(FacesContext p0) throws FacesException
{
}
@Override
public void addPhaseListener(PhaseListener p0)
{
}
}
/**
* Context parameter for activating debug mode, which will disable
* caching.
*/
public static final String DEBUG_INIT_PARAM =
"org.apache.myfaces.trinidad.resource.DEBUG";
// One year in milliseconds. (Actually, just short of on year, since
// RFC 2616 says Expires should not be more than one year out, so
// cutting back just to be safe.)
public static final long ONE_YEAR_MILLIS = 31363200000L;
private static final long _INITIAL_WAIT_TIME = 10L; // 10 milliseconds
private static final long _MAX_WAIT_TIME = 60000L; // 60 * 1000 milliseconds
private static final Class[] _DECORATOR_SIGNATURE =
new Class[]{ResourceLoader.class};
private static final TrinidadLogger _LOG = TrinidadLogger.createTrinidadLogger(ResourceServlet.class);
// Size of buffer used to read in resource contents
private static final int _BUFFER_SIZE = 2048;
private volatile boolean _debug;
private volatile ConcurrentMap _loaders;
private volatile ConcurrentMap> _loaderErrors;
private volatile FacesContextFactory _facesContextFactory;
private volatile Lifecycle _lifecycle;
private volatile ProjectStage _projectStage;
//There are only a handful of headers that this servlet supports being propigated
//to the server. Headers must be included in this white-list in order to be sent
//over. The reason we provide a white-list instead of a black-list is primarily
//for security.
private static final String[] _INCLUDED_HEADERS;
static
{
//Here are some notable headers that are missing from the list:
// "Content-Type" - Set directly on the response
// "Last-Modified" - Sets directly on the response
// "Cache-Control" - This is added because the servlet sets its own
// "Expires" - This is addded because the servlet sets its own
// "Server" - This should reflect THIS server
// "Set-Cookie" - Cookies, right now, are not preserved in the client.
// We are a proxy, we need better cookie handling.
// "Status" - Returned by the servlet container
// "Via" - Intentionally mask any proxying behind the firwall
// "WWW-Authenticate" - This should be handled by this servlet
// "Allow" - Returned by this servlet
String[] tempArray = new String[]
{
"age",
"content-language",
"content-location",
"content-md5",
"content-disposition",
"content-range",
"date",
"link",
"p3p",
"refresh",
"retry-after",
"strict-transport-security",
"trailer",
// "transfer-encoding",
// "vary",
"warning"
};
//Ensure the items are in natural order so they can be binary searched.
Arrays.sort(tempArray);
_INCLUDED_HEADERS = tempArray;
}
}
