diff --git a/src/main/kotlin/com/android/trisolarisserver/controller/Auth.kt b/src/main/kotlin/com/android/trisolarisserver/controller/Auth.kt
index 3eda562..f3e7f1d 100644
--- a/src/main/kotlin/com/android/trisolarisserver/controller/Auth.kt
+++ b/src/main/kotlin/com/android/trisolarisserver/controller/Auth.kt
@@ -7,6 +7,7 @@ import com.android.trisolarisserver.repo.PropertyUserRepo
 import com.android.trisolarisserver.security.MyPrincipal
 import com.google.firebase.auth.FirebaseAuth
 import jakarta.servlet.http.HttpServletRequest
+import org.slf4j.LoggerFactory
 import org.springframework.security.core.annotation.AuthenticationPrincipal
 import org.springframework.web.bind.annotation.GetMapping
 import org.springframework.web.bind.annotation.PostMapping
@@ -21,12 +22,14 @@ class Auth(
     private val appUserRepo: AppUserRepo,
     private val propertyUserRepo: PropertyUserRepo
 ) {
+    private val logger = LoggerFactory.getLogger(Auth::class.java)
 
     @PostMapping("/verify")
     fun verify(
         @AuthenticationPrincipal principal: MyPrincipal?,
         request: HttpServletRequest
     ): AuthResponse {
+        logger.info("Auth verify hit, principalPresent={}", principal != null)
         return buildAuthResponse(principal ?: resolvePrincipalFromHeader(request))
     }