diff --git a/src-tauri/src/api_client.rs b/src-tauri/src/api_client.rs
index 85e6ffc..81f5139 100644
--- a/src-tauri/src/api_client.rs
+++ b/src-tauri/src/api_client.rs
@@ -14,6 +14,7 @@ use crate::api_crypto::{self, ENCRYPTED_HEADER};
 use crate::app_config;
 use crate::auth_session::AuthSession;
 use crate::device_serial;
+use crate::oem_context;
 
 pub async fn request_json(
     method: &str,
@@ -48,6 +49,7 @@ pub async fn request_json(
     if let Ok(val) = HeaderValue::from_str(device_serial::device_serial()) {
         headers.insert(HeaderName::from_static("device_serial"), val);
     }
+    oem_context::apply_install_headers(&mut headers);
     for (k, v) in extra_headers {
         if let (Ok(name), Ok(val)) = (
             HeaderName::from_bytes(k.as_bytes()),
diff --git a/src-tauri/src/lib.rs b/src-tauri/src/lib.rs
index 4471906..8720cfd 100644
--- a/src-tauri/src/lib.rs
+++ b/src-tauri/src/lib.rs
@@ -43,7 +43,9 @@ pub fn run() {
             let heartbeat_handle = handle.clone();
             let oem_id = oem_id::load_oem_id(&handle);
             let agent_id = agent_id::load_agent_id(&handle);
-            app.manage(oem_context::OemContext { oem_id, agent_id });
+            let install_ctx = oem_context::OemContext { oem_id, agent_id };
+            oem_context::init(install_ctx.clone());
+            app.manage(install_ctx);
 
             tauri::async_runtime::block_on(async move {
                 let app_config = handle.state::<app_config::AppConfig>();
diff --git a/src-tauri/src/oem_context.rs b/src-tauri/src/oem_context.rs
index 1c7f6cb..aee94b6 100644
--- a/src-tauri/src/oem_context.rs
+++ b/src-tauri/src/oem_context.rs
@@ -1,8 +1,37 @@
 //! 启动时从 `resources/data/oem`、`resources/data/agent` 解析的安装配置。
 
+use once_cell::sync::OnceCell;
+use reqwest::header::{HeaderMap, HeaderName, HeaderValue};
+
+static INSTALL_CTX: OnceCell<OemContext> = OnceCell::new();
+
 #[derive(Debug, Clone)]
 pub struct OemContext {
     pub oem_id: i64,
     /// 代理版安装包配置；无 `agent` 文件时为 `None`。
     pub agent_id: Option<i64>,
 }
+
+/// 应用启动时写入，供 `api_client` 等模块读取请求头。
+pub fn init(ctx: OemContext) {
+    let _ = INSTALL_CTX.set(ctx);
+}
+
+pub fn current() -> Option<&'static OemContext> {
+    INSTALL_CTX.get()
+}
+
+/// 向 HTTP 请求头写入 `oem_id`、`agent_id`（与 `device_serial` 一致）。
+pub fn apply_install_headers(headers: &mut HeaderMap) {
+    let Some(ctx) = current() else {
+        return;
+    };
+    if let Ok(val) = HeaderValue::from_str(&ctx.oem_id.to_string()) {
+        headers.insert(HeaderName::from_static("oem_id"), val);
+    }
+    if let Some(agent_id) = ctx.agent_id {
+        if let Ok(val) = HeaderValue::from_str(&agent_id.to_string()) {
+            headers.insert(HeaderName::from_static("agent_id"), val);
+        }
+    }
+}