ResponseStatusExceptionHandler logs exception message only

No need to log the full exception for a resolved exception, and as the
comment suggests that it mirrors Spring MVC equivalent, which also
logs the message only.

spring-web/src/main/java/org/springframework/web/server/handler/ResponseStatusExceptionHandler.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -70,7 +70,7 @@ public class ResponseStatusExceptionHandler implements WebExceptionHandler {
 		// Mirrors AbstractHandlerExceptionResolver in spring-webmvc...
 		String logPrefix = exchange.getLogPrefix();
 		if (this.warnLogger != null && this.warnLogger.isWarnEnabled()) {
-			this.warnLogger.warn(logPrefix + formatError(ex, exchange.getRequest()), ex);
+			this.warnLogger.warn(logPrefix + formatError(ex, exchange.getRequest()));
 		}
 		else if (logger.isDebugEnabled()) {
 			logger.debug(logPrefix + formatError(ex, exchange.getRequest()));