diff --git a/include/cinatra/http_server.hpp b/include/cinatra/http_server.hpp
index 35b50429..35c524e9 100644
--- a/include/cinatra/http_server.hpp
+++ b/include/cinatra/http_server.hpp
@@ -601,6 +601,29 @@ class http_server_ : private noncopyable {
     }
   }
 
+  int get_static_dir_filenames(const std::string &dir,
+                               std::vector<std::string> &filenames,
+                               size_t dir_name_length) {
+    fs::path path(dir);
+    if (!fs::exists(path))
+      return -1;
+    fs::directory_iterator end_iter;
+    for (fs::directory_iterator iter(path); iter != end_iter; ++iter) {
+      if (fs::is_directory(iter->status())) {
+        get_static_dir_filenames(iter->path().string(), filenames,
+                                 dir_name_length);
+      }
+      else {
+        auto u8_path_name = iter->path().u8string();
+        std::string relative_path(u8_path_name.begin(), u8_path_name.end());
+        size_t length = relative_path.length();
+        relative_path = relative_path.substr(dir_name_length + 1, length);
+        filenames.push_back(relative_path);
+      }
+    }
+    return filenames.size();
+  }
+
   bool build_http_download_lists_response(request &req,
                                           std::string &&resp_str) {
     std::string res_str = "";
@@ -608,17 +631,13 @@ class http_server_ : private noncopyable {
                                std::string(req.get_header_value("host")) + "/";
     std::string href_of_tail = "\"target=\"_blank\">";
     if (req.get_res_path() == download_display_file_dir_) {
-      std::string file_dir_str = static_dir_;
-      std::filesystem::path dir_path(file_dir_str);
-
-      for (const auto &entry : std::filesystem::directory_iterator(dir_path)) {
-        if (!entry.is_directory()) {
-          auto u8_file_name = entry.path().filename().u8string();
-          std::string file_name_str(u8_file_name.begin(), u8_file_name.end());
-          std::string full_href = href_of_head + file_name_str + href_of_tail +
-                                  file_name_str + "</a></br>";
-          res_str += full_href;
-        }
+      std::vector<std::string> files;
+      size_t static_dir_length = static_dir_.length();
+      get_static_dir_filenames(static_dir_, files, static_dir_length);
+      for (const auto &file : files) {
+        std::string full_href =
+            href_of_head + file + href_of_tail + file + "</a></br>";
+        res_str += full_href;
       }
       std::string ret =
           download_dir_response_head_ + res_str + download_dir_response_tail_;