lib/api: Add /rest/noauth/health health-check (fixes #8430) (#8585)

lib/api/api_auth.go

@@ -44,6 +44,12 @@ func basicAuthAndSessionMiddleware(cookieName string, guiCfg config.GUIConfigura
 			return
 		}
 
+		// Exception for REST calls that don't require authentication.
+		if strings.HasPrefix(r.URL.Path, "/rest/noauth") {
+			next.ServeHTTP(w, r)
+			return
+		}
+
 		cookie, err := r.Cookie(cookieName)
 		if err == nil && cookie != nil {
 			sessionsMut.Lock()