diff --git a/crates/presenter/src/host/addon/http.rs b/crates/presenter/src/host/addon/http.rs
index f73368e..1655028 100644
--- a/crates/presenter/src/host/addon/http.rs
+++ b/crates/presenter/src/host/addon/http.rs
@@ -20,6 +20,7 @@
 use std::time::Duration;
 
 use unlucky_core::download::blocking::block_on;
+use unlucky_core::download::config::DEFAULT_MAX_ATTEMPTS_PER_SOURCE;
 use unlucky_core::download::{DownloadRequest, ResourceKind};
 
 use super::super::env::HostEnv;
@@ -29,7 +30,12 @@ pub(super) const USER_AGENT: &str =
     "Unlucky-Launcher/0.1 (+https://github.com/AskaEth/Unlucky-Launcher)";
 
 /// 最多重试次数（含首次）。
-const ATTEMPTS: u32 = 3;
+///
+/// **不在这里写数字**：取值就是下载引擎的出厂默认
+/// （`core::download::config::DEFAULT_MAX_ATTEMPTS_PER_SOURCE`，同一份 schema 默认值
+/// `download.retry_limit`）。这条带 header 的路径拿不到宿主设置，所以只吃出厂默认——
+/// 数字本身只有一处来源，改工厂默认时这里跟着走。
+const ATTEMPTS: u32 = DEFAULT_MAX_ATTEMPTS_PER_SOURCE;
 
 /// 取一段文本（JSON 原文）。
 pub(super) fn get(env: &HostEnv, url: &str, headers: &[(&str, &str)]) -> Result<String, String> {