add app json headers

components/modal.vue

@@ -34,15 +34,18 @@ const validate = () => {
     }
 }
 const submit = (e: any) => {
-    modal_phone.value = ''
-    isModalOpen.value = false
     fetch(`${apiBase}/custom_request/`, {
         method: 'post',
+        headers: {
+            'Content-Type': 'application/json'
+        },
         body: JSON.stringify({
             name: "from site",
             phone: modal_phone.value
         })
     })
+    modal_phone.value = ''
+    isModalOpen.value = false
 }
 </script>
 <template>