Make logError() in AbstractErrorWebExceptionHandler overrideable

See gh-17863

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/reactive/error/AbstractErrorWebExceptionHandler.java

@@ -263,17 +263,7 @@ public abstract class AbstractErrorWebExceptionHandler implements ErrorWebExcept
 				.flatMap((response) -> write(exchange, response));
 	}
 
-	private boolean isDisconnectedClientError(Throwable ex) {
-		return DISCONNECTED_CLIENT_EXCEPTIONS.contains(ex.getClass().getSimpleName())
-				|| isDisconnectedClientErrorMessage(NestedExceptionUtils.getMostSpecificCause(ex).getMessage());
-	}
-
-	private boolean isDisconnectedClientErrorMessage(String message) {
-		message = (message != null) ? message.toLowerCase() : "";
-		return (message.contains("broken pipe") || message.contains("connection reset by peer"));
-	}
-
-	private void logError(ServerRequest request, ServerResponse response, Throwable throwable) {
+	protected void logError(ServerRequest request, ServerResponse response, Throwable throwable) {
 		if (logger.isDebugEnabled()) {
 			logger.debug(request.exchange().getLogPrefix() + formatError(throwable, request));
 		}
@@ -284,6 +274,16 @@ public abstract class AbstractErrorWebExceptionHandler implements ErrorWebExcept
 		}
 	}
 
+	private boolean isDisconnectedClientError(Throwable ex) {
+		return DISCONNECTED_CLIENT_EXCEPTIONS.contains(ex.getClass().getSimpleName())
+				|| isDisconnectedClientErrorMessage(NestedExceptionUtils.getMostSpecificCause(ex).getMessage());
+	}
+
+	private boolean isDisconnectedClientErrorMessage(String message) {
+		message = (message != null) ? message.toLowerCase() : "";
+		return (message.contains("broken pipe") || message.contains("connection reset by peer"));
+	}
+
 	private String formatError(Throwable ex, ServerRequest request) {
 		String reason = ex.getClass().getSimpleName() + ": " + ex.getMessage();
 		return "Resolved [" + reason + "] for HTTP " + request.methodName() + " " + request.path();