Polish ServletWebRequest

Closes gh-33698

Author: smartandhandsome

spring-web/src/main/java/org/springframework/web/context/request/ServletWebRequest.java

@@ -202,18 +202,23 @@ public boolean checkNotModified(String etag) {
 
 	@Override
 	public boolean checkNotModified(@Nullable String etag, long lastModifiedTimestamp) {
+		if (this.notModified) {
+			return true;
+		}
+
 		HttpServletResponse response = getResponse();
-		if (this.notModified || (response != null && HttpStatus.OK.value() != response.getStatus())) {
-			return this.notModified;
+		if (response != null && HttpStatus.OK.value() != response.getStatus()) {
+			return false;
 		}
+
 		// Evaluate conditions in order of precedence.
 		// See https://datatracker.ietf.org/doc/html/rfc9110#section-13.2.2
 		if (validateIfMatch(etag)) {
 			updateResponseStateChanging(etag, lastModifiedTimestamp);
 			return this.notModified;
 		}
 		// 2) If-Unmodified-Since
-		else if (validateIfUnmodifiedSince(lastModifiedTimestamp)) {
+		if (validateIfUnmodifiedSince(lastModifiedTimestamp)) {
 			updateResponseStateChanging(etag, lastModifiedTimestamp);
 			return this.notModified;
 		}