Use cached requestedSession info if available

Prevent fetching the session multiple times when checking whether the
sessionId has to be sent to the client, by comparing values before
clearing the requestedSessionCache.

Resolves: #1424

Author: oxc

spring-session-core/src/main/java/org/springframework/session/web/http/SessionRepositoryFilter.java

@@ -221,10 +221,11 @@ private void commitSession() {
 			}
 			else {
 				S session = wrappedSession.getSession();
+				String sessionId = session.getId();
+				final boolean isRequestedSession = isRequestedSessionIdValid() && sessionId.equals(getRequestedSessionId());
 				clearRequestedSessionCache();
 				SessionRepositoryFilter.this.sessionRepository.save(session);
-				String sessionId = session.getId();
-				if (!isRequestedSessionIdValid() || !sessionId.equals(getRequestedSessionId())) {
+				if (!isRequestedSession) {
 					SessionRepositoryFilter.this.httpSessionIdResolver.setSessionId(this, this.response, sessionId);
 				}
 			}