proxy server timeout on continuation checks for 0 client and exchange timeout and set continuation as 'infinite'

git-svn-id: svn+ssh://dev.eclipse.org/svnroot/rt/org.eclipse.jetty/jetty/trunk@3405 7e9141cc-0065-0410-87d8-b60c137991c4

jetty-servlets/src/main/java/org/eclipse/jetty/servlets/ProxyServlet.java

@@ -608,7 +608,14 @@ public class ProxyServlet implements Servlet
                 
                 // continuation fudge factor of 1000, underlying components
                 // should fail/expire first
+                if ( ctimeout == 0 )
+                {
+                    continuation.setTimeout(0);  // ideally never times out
+                }
+                else
+                {    
                     continuation.setTimeout(ctimeout + 1000);
+                }
                                 
                 customizeContinuation(continuation);