401382 Prevent parseAvailable from parsing next chunk when previous has not been consumed. Handle no content-type in chunked request.

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

@@ -581,6 +581,12 @@ public class ProxyServlet implements Servlet
                     String hdr = (String)enm.nextElement();
                     String lhdr = hdr.toLowerCase();
 
+                    if ("transfer-encoding".equals(lhdr))
+                    {
+                        if (request.getHeader("transfer-encoding").indexOf("chunk")>=0)
+                            hasContent = true;
+                    }
+                    
                     if (_DontProxyHeaders.contains(lhdr))
                         continue;
                     if (connectionHdr != null && connectionHdr.indexOf(lhdr) >= 0)

jetty-servlets/src/test/java/org/eclipse/jetty/servlets/ProxyServletTest.java

@@ -265,7 +265,6 @@ public class ProxyServletTest
                 "PUT /proxy/test HTTP/1.1\r\n"+
                 "Host: localhost:"+_connector.getLocalPort()+"\r\n"+
                 "Transfer-Encoding: chunked\r\n"+
-                "Content-Type: text/plain\r\n"+
                 "Connection: close\r\n"+
                 "\r\n"+
                 "A\r\n"+