slight improvement in HttpSessionRequestCache

Closes gh-11666

web/src/main/java/org/springframework/security/web/savedrequest/HttpSessionRequestCache.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -67,12 +67,13 @@ public class HttpSessionRequestCache implements RequestCache {
 			}
 			return;
 		}
-		DefaultSavedRequest savedRequest = new DefaultSavedRequest(request, this.portResolver,
-				this.matchingRequestParameterName);
+
 		if (this.createSessionAllowed || request.getSession(false) != null) {
 			// Store the HTTP request itself. Used by
 			// AbstractAuthenticationProcessingFilter
 			// for redirection after successful authentication (SEC-29)
+			DefaultSavedRequest savedRequest = new DefaultSavedRequest(request, this.portResolver,
+					this.matchingRequestParameterName);
 			request.getSession().setAttribute(this.sessionAttrName, savedRequest);
 			if (this.logger.isDebugEnabled()) {
 				this.logger.debug(LogMessage.format("Saved request %s to session", savedRequest.getRedirectUrl()));