Tests pass

For Tomcat, failures occur if HttpHandlerServlet buffer size is
significantly less than the Tomcat input buffer size.

Also on command line Jetty tests fail with port unavailable unless
the server from the Tomcat tests is also destroyed.

spring-web-reactive/src/main/java/org/springframework/reactive/web/servlet/HttpHandlerServlet.java

@@ -34,7 +34,7 @@ import org.springframework.reactive.web.HttpHandler;
 @WebServlet(asyncSupported = true )
 public class HttpHandlerServlet extends HttpServlet {
 
-	private static final int BUFFER_SIZE = 4096;
+	private static final int BUFFER_SIZE = 8192;
 
 	private HttpHandler handler;