fix: headers missing

playground/pages/cookie.vue

@@ -0,0 +1,19 @@
+<script setup lang="ts">
+const counter = useCookie('counter')
+counter.value = counter.value || Math.round(Math.random() * 1000)
+</script>
+
+<template>
+  <div>
+    <h1> Counter: {{ counter || '-' }}</h1>
+    <button @click="counter = null">
+      reset
+    </button>
+    <button @click="counter--">
+      -
+    </button>
+    <button @click="counter++">
+      +
+    </button>
+  </div>
+</template>