Merge branch 'stable-3.0' into stable-3.1

* stable-3.0:
  Create HTTP session only for login requests

Change-Id: Ib0c8e2a2a5fa0c153de294df4b04e612bf25bed4

src/main/java/com/googlesource/gerrit/plugins/saml/SamlWebFilter.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/saml/SamlWebFilter.java b/src/main/java/com/googlesource/gerrit/plugins/saml/SamlWebFilter.java
index ee4c72f..2c6549f 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/saml/SamlWebFilter.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/saml/SamlWebFilter.java
@@ -145,13 +145,13 @@
     */
     HttpServletRequest httpRequest = new AnonymousHttpRequest((HttpServletRequest) incomingRequest);
     HttpServletResponse httpResponse = (HttpServletResponse) response;
-    AuthenticatedUser user = userFromRequest(httpRequest);
 
     try {
       if (isSamlPostback(httpRequest)) {
         J2EContext context = new J2EContext(httpRequest, httpResponse);
         signin(context);
       } else if (isGerritLogin(httpRequest)) {
+        AuthenticatedUser user = userFromRequest(httpRequest);
         if (user == null) {
           J2EContext context = new J2EContext(httpRequest, httpResponse);
           redirectToIdentityProvider(context);