diff --git a/examples/custom-http-res/res/test.png b/examples/custom-http-res/res/test.png
new file mode 100644
index 0000000..73d8eb0
Binary files /dev/null and b/examples/custom-http-res/res/test.png differ
diff --git a/examples/custom-http-res/src/index.ts b/examples/custom-http-res/src/index.ts
index 8fed94d..ba933ad 100644
--- a/examples/custom-http-res/src/index.ts
+++ b/examples/custom-http-res/src/index.ts
@@ -1,4 +1,5 @@
-import * as path from "path";
+import fs from "fs/promises";
+import path from 'path';
 import { HttpConnection, HttpServer } from "tsrpc";
 import { serviceProto } from "./shared/protocols/serviceProto";
 
@@ -9,17 +10,24 @@ const server = new HttpServer(serviceProto, {
 });
 
 // Custom HTTP Reponse
-server.flows.preRecvBufferFlow.push(v => {
+server.flows.preRecvBufferFlow.push(async v => {
     let conn = v.conn as HttpConnection;
 
     if (conn.httpReq.method === 'GET') {
-        // 特定 URL: /test
-        if (conn.httpReq.url === '/test') {
-            conn.httpRes.end('test test')
-            return undefined;
+        // Static File Service
+        if (conn.httpReq.url) {
+            // Check whether the file is existed
+            let resFilePath = path.join('res', conn.httpReq.url)
+            let isExisted = await fs.access(resFilePath).then(() => true).catch(() => false);
+            if (isExisted) {
+                // Response the file
+                let content = await fs.readFile(resFilePath);
+                conn.httpRes.end(content);
+                return undefined;
+            }
         }
 
-        // 默认 GET 响应
+        // default GET response
         conn.httpRes.end('Hello World');
         return undefined;
     }