diff --git a/src/server/vercel/api/index.js b/src/server/vercel/api/index.js
index 82796d269..96403ded5 100644
--- a/src/server/vercel/api/index.js
+++ b/src/server/vercel/api/index.js
@@ -614,9 +614,8 @@ async function commentSubmit (event, request) {
   try {
     logger.log('开始异步垃圾检测、发送评论通知')
     logger.log('POST_SUBMIT')
-    const baseUrl = process.env.CUSTOM_DOMAIN ? `https://${process.env.CUSTOM_DOMAIN}` : `https://${request.headers.host}`
     await Promise.race([
-      axios.post(baseUrl, {
+      axios.post(`https://${process.env.CUSTOM_DOMAIN}`, {
         event: 'POST_SUBMIT',
         comment
       }, { headers: { 'x-twikoo-recursion': config.ADMIN_PASS || 'true' } }),