Clean HTTP Resources when NettyWebServer stops

This commit is a temporary workaround for gh-9146; it cleans the HTTP
resources associated with the Netty server.

Author: bclozel

spring-boot/src/main/java/org/springframework/boot/web/embedded/netty/NettyWebServer.java

@@ -20,6 +20,7 @@
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
+import reactor.ipc.netty.http.HttpResources;
 import reactor.ipc.netty.http.server.HttpServer;
 import reactor.ipc.netty.tcp.BlockingNettyContext;
 
@@ -98,6 +99,8 @@ public void run() {
 	public void stop() throws WebServerException {
 		if (this.nettyContext != null) {
 			this.nettyContext.shutdown();
+			// temporary fix for gh-9146
+			this.nettyContext.getContext().onClose().doOnSuccess(aVoid -> HttpResources.reset()).block();
 			this.nettyContext = null;
 		}
 	}