diff --git a/docs/en_US/guide/q3.md b/docs/en_US/guide/q3.md
index c106745e..184eae83 100644
--- a/docs/en_US/guide/q3.md
+++ b/docs/en_US/guide/q3.md
@@ -63,4 +63,47 @@ Enable Cloudflare CDN (optional)
 According to Cloudflare gRPC requirements: gRPC services must listen on port 443 and must support TLS and HTTP/2.
 So if you need to enable CDN, you must use port 443 when configuring Nginx or Caddy reverse proxy gRPC and configure the certificate (Caddy will automatically apply and configure the certificate).
 
--  Log in to Cloudflare and select the domain you are using. Go to the `Network` page and turn on the `gRPC` switch, then go to the `DNS` page, find the resolution record of the domain with gRPC configuration, and turn on the orange cloud icon to enable CDN.
\ No newline at end of file
+-  Log in to Cloudflare and select the domain you are using. Go to the `Network` page and turn on the `gRPC` switch, then go to the `DNS` page, find the resolution record of the domain with gRPC configuration, and turn on the orange cloud icon to enable CDN.
+
+After enable `gRPC` at cloudflare, it may not work immediately，so you may need to wait for a while, about 24hour or more. To be test if gRPC work, we can use `curl` and `nezha-agent -d`：
+
+```bash
+localhost:~/agent# curl -H "content-type: application/grpc+proto" -H "authorization: Bearer test" https://xxx.xxx.ovh -v 
+* processing: https://xxx.xxx.ovh
+*   Trying [2606:4700:3035::ac43:8bed]:443...
+* Connected to xxx.xxx.ovh (2606:4700:3035::ac43:8bed) port 443
+# ... SSL info
+* using HTTP/2
+* h2 [:method: GET]
+* h2 [:scheme: https]
+* h2 [:authority: xxx.xxx.ovh]
+* h2 [:path: /]
+* h2 [user-agent: curl/8.2.1]
+* h2 [accept: */*]
+* Using Stream ID: 1
+> GET / HTTP/2
+> Host: xxx.xxx.ovh
+> User-Agent: curl/8.4.0
+> Accept: */*
+> content-type: application/grpc+proto
+> authorization: Bearer test
+> 
+< HTTP/2 405 
+< date: Wed, 20 Dec 2023 08:56:27 GMT
+< content-type: application/grpc+proto
+< cf-ray: 8386ac12dabd5ddc-HKG
+< cf-cache-status: DYNAMIC
+< grpc-message: Received a HEADERS frame with :method "GET" which should be POST
+< grpc-status: 13
+< report-to: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=%2BTjgJvXWyRF11nUOYx9Lq7UDC1xOYBLtjvWrdjVJQIqu9YqnFJeZFran2KRs6zabQc%2BLV8AubNqYRYDb7hQAZe6bglmVz0wQjrb0tNovYf%2B59SAp%2BQfZnH%2BAFDydNT95ZCmTPnKgWetcwQiUfXU%3D"}],"group":"cf-nel","max_age":604800}
+< nel: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
+< vary: Accept-Encoding
+< server: cloudflare
+< alt-svc: h3=":443"; ma=86400
+< 
+* Connection #0 to host xxx.xxx.ovh left intact
+localhost:~/agent# /opt/nezha/agent/nezha-agent -s xxx.xxx.ovh:443 -p YOUR_KEY --tls -d
+NEZHA@2023-12-20 05:14:00>> 检查更新： 0.15.14
+NEZHA@2023-12-20 05:14:01>> 上报系统信息失败： rpc error: code = Unknown desc = EOF # Edit GRPCHost and TLS at /opt/nezha/dashboard/data/config.yaml.
+NEZHA@2023-12-20 05:14:01>> Error to close connection ...
+```
diff --git a/docs/guide/q3.md b/docs/guide/q3.md
index e23448c0..2b56103a 100644
--- a/docs/guide/q3.md
+++ b/docs/guide/q3.md
@@ -64,3 +64,46 @@ Agent 端配置
 所以如果需要开启 CDN，必须在配置 Nginx 或者 Caddy 反向代理 gRPC 时使用 443 端口，并配置证书（Caddy 会自动申请并配置证书）。
 
 - 登录 Cloudflare，选择使用的域名。打开 `网络` 选项将 `gRPC` 开关打开，打开 `DNS` 选项，找到 Nginx 或 Caddy 反代 gRPC 配置的域名的解析记录，打开橙色云启用 CDN。
+
+开启`gRPC`后，可能不能立即可用，需要等待一段时间。具体可通过`curl`和使用`nezha-agent -d`来验证：
+
+```bash
+localhost:~/agent# curl -H "content-type: application/grpc+proto" -H "authorization: Bearer test" https://xxx.xxx.ovh -v 
+* processing: https://xxx.xxx.ovh
+*   Trying [2606:4700:3035::ac43:8bed]:443...
+* Connected to xxx.xxx.ovh (2606:4700:3035::ac43:8bed) port 443
+# ... SSL info
+* using HTTP/2
+* h2 [:method: GET]
+* h2 [:scheme: https]
+* h2 [:authority: xxx.xxx.ovh]
+* h2 [:path: /]
+* h2 [user-agent: curl/8.2.1]
+* h2 [accept: */*]
+* Using Stream ID: 1
+> GET / HTTP/2
+> Host: xxx.xxx.ovh
+> User-Agent: curl/8.4.0
+> Accept: */*
+> content-type: application/grpc+proto
+> authorization: Bearer test
+> 
+< HTTP/2 405 
+< date: Wed, 20 Dec 2023 08:56:27 GMT
+< content-type: application/grpc+proto
+< cf-ray: 8386ac12dabd5ddc-HKG
+< cf-cache-status: DYNAMIC
+< grpc-message: Received a HEADERS frame with :method "GET" which should be POST
+< grpc-status: 13
+< report-to: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=%2BTjgJvXWyRF11nUOYx9Lq7UDC1xOYBLtjvWrdjVJQIqu9YqnFJeZFran2KRs6zabQc%2BLV8AubNqYRYDb7hQAZe6bglmVz0wQjrb0tNovYf%2B59SAp%2BQfZnH%2BAFDydNT95ZCmTPnKgWetcwQiUfXU%3D"}],"group":"cf-nel","max_age":604800}
+< nel: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
+< vary: Accept-Encoding
+< server: cloudflare
+< alt-svc: h3=":443"; ma=86400
+< 
+* Connection #0 to host xxx.xxx.ovh left intact
+localhost:~/agent# /opt/nezha/agent/nezha-agent -s nezha.xxx.xxx:443 -p YOUR_KEY --tls -d
+NEZHA@2023-12-20 05:14:00>> 检查更新： 0.15.14
+NEZHA@2023-12-20 05:14:01>> 上报系统信息失败： rpc error: code = Unknown desc = EOF # 需要修改主控端 /opt/nezha/dashboard/data/config.yaml的 GRPCHost 和 TLS 选项
+NEZHA@2023-12-20 05:14:01>> Error to close connection ...
+```