diff --git a/config/docker/caddy/web-app/Caddyfile b/config/docker/caddy/web-app/Caddyfile
index 5ea67c25..f8f93c07 100644
--- a/config/docker/caddy/web-app/Caddyfile
+++ b/config/docker/caddy/web-app/Caddyfile
@@ -25,13 +25,14 @@
 			header_up Host {upstream_hostport}
 			header_up X-Real-IP {remote_host}
 			header_up X-Forwarded-For {remote_host}
+			header_up X-Forwarded-Proto {scheme}
 		}
 
 		header {
 			Access-Control-Allow-Origin "*"
 			Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS"
 			Access-Control-Allow-Headers "*"
-			X-Caddy-Strategy "same-origin-v28"
+			X-Caddy-Strategy "same-origin-v31"
 		}
 	}
 
diff --git a/frontend/features/nennung-feature/src/commonMain/kotlin/at/mocode/frontend/features/nennung/presentation/web/OnlineNennungFormular.kt b/frontend/features/nennung-feature/src/commonMain/kotlin/at/mocode/frontend/features/nennung/presentation/web/OnlineNennungFormular.kt
index a32cd5c1..99bdf8b0 100644
--- a/frontend/features/nennung-feature/src/commonMain/kotlin/at/mocode/frontend/features/nennung/presentation/web/OnlineNennungFormular.kt
+++ b/frontend/features/nennung-feature/src/commonMain/kotlin/at/mocode/frontend/features/nennung/presentation/web/OnlineNennungFormular.kt
@@ -401,7 +401,7 @@ fun OnlineNennungFormular(
                 onNennenAbgeschickt(payload) { success, error ->
                   isLoading = false
                   if (!success) {
-                    errorMessage = "Senden fehlgeschlagen: " + (error ?: "Netzwerkfehler oder Server nicht erreichbar. Bitte die Browser-Konsole (F12) prüfen.")
+                    errorMessage = "Senden fehlgeschlagen: " + (error ?: "Fehler beim Server-Aufruf. Bitte prüfen Sie die Browser-Konsole (F12) auf Netzwerk-Fehler.")
                   }
                 }
               }
diff --git a/frontend/shells/meldestelle-web/src/wasmJsMain/kotlin/at/mocode/frontend/shell/web/WebMainScreen.kt b/frontend/shells/meldestelle-web/src/wasmJsMain/kotlin/at/mocode/frontend/shell/web/WebMainScreen.kt
index ed8f62eb..3c6745f6 100644
--- a/frontend/shells/meldestelle-web/src/wasmJsMain/kotlin/at/mocode/frontend/shell/web/WebMainScreen.kt
+++ b/frontend/shells/meldestelle-web/src/wasmJsMain/kotlin/at/mocode/frontend/shell/web/WebMainScreen.kt
@@ -126,7 +126,7 @@ fun MainAppContent() {
       // Dezentraler Versions-Marker in der unteren rechten Ecke
       Box(modifier = Modifier.fillMaxSize().padding(8.dp), contentAlignment = Alignment.BottomEnd) {
         Text(
-          text = "v2026-04-23.30 - COMPILE FIX",
+          text = "v2026-04-23.31 - SAME-ORIGIN v3",
           style = MaterialTheme.typography.labelSmall,
           color = Color.LightGray.copy(alpha = 0.5f)
         )