diff --git a/README.md b/README.md
index 60f4c353d..9d325795e 100644
--- a/README.md
+++ b/README.md
@@ -185,7 +185,7 @@ std::vector<char> buffer = struct_pack::serialize(person1);
 auto person2 = deserialize<person>(buffer);
 ```
 
-struct_pack is very faster. 
+struct_pack is very fast. 
 
 ![](https://alibaba.github.io/yalantinglibs/assets/struct_pack_bench_serialize.4ffb0ce6.png)
 
diff --git a/include/ylt/coro_io/coro_io.hpp b/include/ylt/coro_io/coro_io.hpp
index 058ffb730..d60b08f4d 100644
--- a/include/ylt/coro_io/coro_io.hpp
+++ b/include/ylt/coro_io/coro_io.hpp
@@ -25,6 +25,7 @@
 #endif
 
 #include <asio/connect.hpp>
+#include <asio/dispatch.hpp>
 #include <asio/ip/tcp.hpp>
 #include <asio/read.hpp>
 #include <asio/read_until.hpp>
@@ -282,20 +283,42 @@ inline async_simple::coro::Lazy<void> sleep_for(Duration d) {
   }
 }
 
-template <typename Func>
-inline async_simple::coro::Lazy<void> post(
-    Func func,
-    coro_io::ExecutorWrapper<> *e = coro_io::get_global_block_executor()) {
-  callback_awaitor<void> awaitor;
-
-  co_return co_await awaitor.await_resume(
-      [e, func = std::move(func)](auto handler) {
-        auto executor = e->get_asio_executor();
-        asio::post(executor, [=, func = std::move(func)]() {
+template <typename R, typename Func>
+struct post_helper {
+  void operator()(auto handler) const {
+    asio::dispatch(e->get_asio_executor(), [this, handler]() {
+      try {
+        if constexpr (std::is_same_v<R, async_simple::Try<void>>) {
           func();
           handler.resume();
-        });
-      });
+        }
+        else {
+          auto r = func();
+          handler.set_value_then_resume(std::move(r));
+        }
+      } catch (const std::exception &e) {
+        R er;
+        er.setException(std::current_exception());
+        handler.set_value_then_resume(std::move(er));
+      }
+    });
+  }
+  coro_io::ExecutorWrapper<> *e;
+  Func func;
+};
+
+template <typename Func>
+inline async_simple::coro::Lazy<
+    async_simple::Try<typename util::function_traits<Func>::return_type>>
+post(Func func,
+     coro_io::ExecutorWrapper<> *e = coro_io::get_global_block_executor()) {
+  using R =
+      async_simple::Try<typename util::function_traits<Func>::return_type>;
+
+  callback_awaitor<R> awaitor;
+
+  post_helper<R, Func> helper{e, std::move(func)};
+  co_return co_await awaitor.await_resume(helper);
 }
 
 template <typename Socket, typename AsioBuffer>
diff --git a/include/ylt/coro_rpc/impl/context.hpp b/include/ylt/coro_rpc/impl/context.hpp
index d9f1e6d5a..b4748b10e 100644
--- a/include/ylt/coro_rpc/impl/context.hpp
+++ b/include/ylt/coro_rpc/impl/context.hpp
@@ -159,8 +159,9 @@ struct get_type_t<async_simple::coro::Lazy<T>> {
 template <auto func>
 inline auto get_return_type() {
   using T = decltype(func);
-  using param_type = function_parameters_t<T>;
-  using return_type = typename get_type_t<function_return_type_t<T>>::type;
+  using param_type = util::function_parameters_t<T>;
+  using return_type =
+      typename get_type_t<util::function_return_type_t<T>>::type;
   if constexpr (std::is_void_v<param_type>) {
     if constexpr (std::is_void_v<return_type>) {
       return;
@@ -171,7 +172,8 @@ inline auto get_return_type() {
   }
   else {
     using First = std::tuple_element_t<0, param_type>;
-    constexpr bool is_conn = is_specialization<First, context_base>::value;
+    constexpr bool is_conn =
+        util::is_specialization<First, context_base>::value;
 
     if constexpr (is_conn) {
       using U = typename First::return_type;
diff --git a/include/ylt/coro_rpc/impl/coro_rpc_client.hpp b/include/ylt/coro_rpc/impl/coro_rpc_client.hpp
index 2a8bda43b..1a7529f45 100644
--- a/include/ylt/coro_rpc/impl/coro_rpc_client.hpp
+++ b/include/ylt/coro_rpc/impl/coro_rpc_client.hpp
@@ -486,41 +486,42 @@ class coro_rpc_client {
   template <auto func, typename... Args>
   void static_check() {
     using Function = decltype(func);
-    using param_type = function_parameters_t<Function>;
+    using param_type = util::function_parameters_t<Function>;
     if constexpr (!std::is_void_v<param_type>) {
       using First = std::tuple_element_t<0, param_type>;
       constexpr bool is_conn = requires { typename First::return_type; };
 
       if constexpr (std::is_member_function_pointer_v<Function>) {
-        using Self = class_type_t<Function>;
+        using Self = util::class_type_t<Function>;
         if constexpr (is_conn) {
-          static_assert(is_invocable<Function, Self, First, Args...>::value,
-                        "called rpc function and arguments are not match");
+          static_assert(
+              util::is_invocable<Function, Self, First, Args...>::value,
+              "called rpc function and arguments are not match");
         }
         else {
-          static_assert(is_invocable<Function, Self, Args...>::value,
+          static_assert(util::is_invocable<Function, Self, Args...>::value,
                         "called rpc function and arguments are not match");
         }
       }
       else {
         if constexpr (is_conn) {
-          static_assert(is_invocable<Function, First, Args...>::value,
+          static_assert(util::is_invocable<Function, First, Args...>::value,
                         "called rpc function and arguments are not match");
         }
         else {
-          static_assert(is_invocable<Function, Args...>::value,
+          static_assert(util::is_invocable<Function, Args...>::value,
                         "called rpc function and arguments are not match");
         }
       }
     }
     else {
       if constexpr (std::is_member_function_pointer_v<Function>) {
-        using Self = class_type_t<Function>;
-        static_assert(is_invocable<Function, Self, Args...>::value,
+        using Self = util::class_type_t<Function>;
+        static_assert(util::is_invocable<Function, Self, Args...>::value,
                       "called rpc function and arguments are not match");
       }
       else {
-        static_assert(is_invocable<Function, Args...>::value,
+        static_assert(util::is_invocable<Function, Args...>::value,
                       "called rpc function and arguments are not match");
       }
     }
@@ -661,7 +662,7 @@ class coro_rpc_client {
     std::vector<std::byte> buffer;
     std::size_t offset = coro_rpc_protocol::REQ_HEAD_LEN;
     if constexpr (sizeof...(Args) > 0) {
-      using arg_types = function_parameters_t<decltype(func)>;
+      using arg_types = util::function_parameters_t<decltype(func)>;
       pack_to<arg_types>(buffer, offset, std::forward<Args>(args)...);
     }
     else {
@@ -723,7 +724,7 @@ class coro_rpc_client {
   auto get_func_args() {
     using First = std::tuple_element_t<0, FuncArgs>;
     constexpr bool has_conn_v = requires { typename First::return_type; };
-    return get_args<has_conn_v, FuncArgs>();
+    return util::get_args<has_conn_v, FuncArgs>();
   }
 
   template <typename... FuncArgs, typename Buffer, typename... Args>
diff --git a/include/ylt/coro_rpc/impl/coro_rpc_server.hpp b/include/ylt/coro_rpc/impl/coro_rpc_server.hpp
index ccd6d0b29..9786912e3 100644
--- a/include/ylt/coro_rpc/impl/coro_rpc_server.hpp
+++ b/include/ylt/coro_rpc/impl/coro_rpc_server.hpp
@@ -236,12 +236,13 @@ class coro_rpc_server_base {
    */
 
   template <auto first, auto... functions>
-  void register_handler(class_type_t<decltype(first)> *self) {
+  void register_handler(util::class_type_t<decltype(first)> *self) {
     router_.template register_handler<first, functions...>(self);
   }
 
   template <auto first>
-  void register_handler(class_type_t<decltype(first)> *self, const auto &key) {
+  void register_handler(util::class_type_t<decltype(first)> *self,
+                        const auto &key) {
     router_.template register_handler<first>(self, key);
   }
 
diff --git a/include/ylt/coro_rpc/impl/router.hpp b/include/ylt/coro_rpc/impl/router.hpp
index c28f361ce..0e85aa96d 100644
--- a/include/ylt/coro_rpc/impl/router.hpp
+++ b/include/ylt/coro_rpc/impl/router.hpp
@@ -127,8 +127,9 @@ class router {
       AS_UNLIKELY { ELOGV(CRITICAL, "null connection!"); }
 
     constexpr auto name = get_func_name<func>();
-    using return_type = function_return_type_t<decltype(func)>;
-    if constexpr (is_specialization_v<return_type, async_simple::coro::Lazy>) {
+    using return_type = util::function_return_type_t<decltype(func)>;
+    if constexpr (util::is_specialization_v<return_type,
+                                            async_simple::coro::Lazy>) {
       auto it = coro_handlers_.emplace(
           key,
           [self](
@@ -179,10 +180,11 @@ class router {
   void regist_one_handler_impl(const route_key &key) {
     static_assert(!std::is_member_function_pointer_v<decltype(func)>,
                   "register member function but lack of the parent object");
-    using return_type = function_return_type_t<decltype(func)>;
+    using return_type = util::function_return_type_t<decltype(func)>;
 
     constexpr auto name = get_func_name<func>();
-    if constexpr (is_specialization_v<return_type, async_simple::coro::Lazy>) {
+    if constexpr (util::is_specialization_v<return_type,
+                                            async_simple::coro::Lazy>) {
       auto it = coro_handlers_.emplace(
           key,
           [](std::string_view data, rpc_context<rpc_protocol> &context_info,
@@ -350,13 +352,13 @@ class router {
    */
 
   template <auto first, auto... func>
-  void register_handler(class_type_t<decltype(first)> *self) {
+  void register_handler(util::class_type_t<decltype(first)> *self) {
     regist_one_handler<first>(self);
     (regist_one_handler<func>(self), ...);
   }
 
   template <auto func>
-  void register_handler(class_type_t<decltype(func)> *self,
+  void register_handler(util::class_type_t<decltype(func)> *self,
                         const route_key &key) {
     regist_one_handler_impl<func>(self, key);
   }
diff --git a/include/ylt/coro_rpc/impl/rpc_execute.hpp b/include/ylt/coro_rpc/impl/rpc_execute.hpp
index 1c0223e08..0a93a2338 100644
--- a/include/ylt/coro_rpc/impl/rpc_execute.hpp
+++ b/include/ylt/coro_rpc/impl/rpc_execute.hpp
@@ -54,8 +54,8 @@ inline std::optional<std::string> execute(
     std::string_view data, rpc_context<rpc_protocol> &context_info,
     Self *self = nullptr) {
   using T = decltype(func);
-  using param_type = function_parameters_t<T>;
-  using return_type = function_return_type_t<T>;
+  using param_type = util::function_parameters_t<T>;
+  using return_type = util::function_return_type_t<T>;
 
   if constexpr (!std::is_void_v<param_type>) {
     using First = std::tuple_element_t<0, param_type>;
@@ -69,7 +69,7 @@ inline std::optional<std::string> execute(
     constexpr bool has_coro_conn_v =
         std::is_convertible_v<context_base<conn_return_type, rpc_protocol>,
                               First>;
-    auto args = get_args<has_coro_conn_v, param_type>();
+    auto args = util::get_args<has_coro_conn_v, param_type>();
 
     bool is_ok = true;
     constexpr size_t size = std::tuple_size_v<decltype(args)>;
@@ -155,9 +155,9 @@ inline async_simple::coro::Lazy<std::optional<std::string>> execute_coro(
     std::string_view data, rpc_context<rpc_protocol> &context_info,
     Self *self = nullptr) {
   using T = decltype(func);
-  using param_type = function_parameters_t<T>;
-  using return_type =
-      typename get_type_t<typename function_return_type_t<T>::ValueType>::type;
+  using param_type = util::function_parameters_t<T>;
+  using return_type = typename get_type_t<
+      typename util::function_return_type_t<T>::ValueType>::type;
 
   if constexpr (!std::is_void_v<param_type>) {
     using First = std::tuple_element_t<0, param_type>;
@@ -170,7 +170,7 @@ inline async_simple::coro::Lazy<std::optional<std::string>> execute_coro(
     using conn_return_type = decltype(get_return_type<is_conn, First>());
     constexpr bool has_coro_conn_v =
         std::is_same_v<context_base<conn_return_type, rpc_protocol>, First>;
-    auto args = get_args<has_coro_conn_v, param_type>();
+    auto args = util::get_args<has_coro_conn_v, param_type>();
 
     bool is_ok = true;
     constexpr size_t size = std::tuple_size_v<decltype(args)>;
diff --git a/include/ylt/util/type_traits.h b/include/ylt/util/type_traits.h
index 6dabf57b2..15b1ad768 100644
--- a/include/ylt/util/type_traits.h
+++ b/include/ylt/util/type_traits.h
@@ -30,7 +30,7 @@ using remove_cvref_t = typename remove_cvref<T>::type;
 #endif
 #endif
 
-namespace coro_rpc {
+namespace util {
 template <typename Function>
 struct function_traits;
 
@@ -213,4 +213,4 @@ struct is_specialization<Ref<Args...>, Ref> : std::true_type {};
 template <typename Test, template <typename...> class Ref>
 inline constexpr bool is_specialization_v = is_specialization<Test, Ref>::value;
 
-}  // namespace coro_rpc
+}  // namespace util
diff --git a/src/coro_rpc/tests/test_coro_rpc_client.cpp b/src/coro_rpc/tests/test_coro_rpc_client.cpp
index 19653f188..4aee088cb 100644
--- a/src/coro_rpc/tests/test_coro_rpc_client.cpp
+++ b/src/coro_rpc/tests/test_coro_rpc_client.cpp
@@ -478,6 +478,7 @@ TEST_CASE("testing client call timeout") {
     CHECK_MESSAGE(val.error().code == std::errc::timed_out, val.error().msg);
     g_action = inject_action::nothing;
   }
+#ifdef __GNUC__
   SUBCASE("read timeout") {
     g_action = {};
     coro_rpc_server server(2, 8801);
@@ -494,6 +495,7 @@ TEST_CASE("testing client call timeout") {
     auto val = syncAwait(ret);
     CHECK_MESSAGE(val.error().code == std::errc::timed_out, val.error().msg);
   }
+#endif
   g_action = {};
 }
 std::errc init_acceptor(auto& acceptor_, auto port_) {
diff --git a/src/coro_rpc/tests/test_router.cpp b/src/coro_rpc/tests/test_router.cpp
index b72f50505..96636f12b 100644
--- a/src/coro_rpc/tests/test_router.cpp
+++ b/src/coro_rpc/tests/test_router.cpp
@@ -66,12 +66,12 @@ struct RPC_trait<void> {
 };
 using coro_rpc_protocol = coro_rpc::protocol::coro_rpc_protocol;
 template <auto func>
-rpc_result<function_return_type_t<decltype(func)>, coro_rpc_protocol>
+rpc_result<util::function_return_type_t<decltype(func)>, coro_rpc_protocol>
 get_result(const auto &pair) {
   auto &&[rpc_errc, buffer] = pair;
-  using T = function_return_type_t<decltype(func)>;
-  using return_type =
-      rpc_result<function_return_type_t<decltype(func)>, coro_rpc_protocol>;
+  using T = util::function_return_type_t<decltype(func)>;
+  using return_type = rpc_result<util::function_return_type_t<decltype(func)>,
+                                 coro_rpc_protocol>;
   rpc_return_type_t<T> ret;
   struct_pack::errc ec;
   coro_rpc_protocol::rpc_error err;
@@ -144,7 +144,7 @@ auto test_route(auto ctx, Args &&...args) {
 template <auto func, typename... Args>
 void test_route_and_check(auto conn, Args &&...args) {
   auto pair = test_route<func>(conn, std::forward<Args>(args)...);
-  using R = function_return_type_t<decltype(func)>;
+  using R = util::function_return_type_t<decltype(func)>;
   check_result<R>(pair, coro_rpc_protocol::RESP_HEAD_LEN);
 }
 }  // namespace test_util
diff --git a/src/util/tests/test_meta_string.cpp b/src/util/tests/test_meta_string.cpp
index 0613f6c96..79324fa6c 100644
--- a/src/util/tests/test_meta_string.cpp
+++ b/src/util/tests/test_meta_string.cpp
@@ -167,7 +167,7 @@ struct Plus {
 };
 
 constexpr void function_traits_test_return_type() {
-  using namespace coro_rpc;
+  using namespace util;
   static_assert(std::is_same_v<function_return_type_t<int(int)>, int>);
   auto f1 = []() {
   };
@@ -208,7 +208,7 @@ constexpr void function_traits_test_return_type() {
 }
 
 constexpr void function_traits_test_last_parameters_type() {
-  using namespace coro_rpc;
+  using namespace util;
   static_assert(std::is_same_v<last_parameters_type_t<int(int&&)>, int>);
   auto f1 = [](int&) {
   };
diff --git a/website/docs/zh/coro_rpc/coro_rpc_doc.hpp b/website/docs/zh/coro_rpc/coro_rpc_doc.hpp
index 57b370cdf..4f7dd8e44 100644
--- a/website/docs/zh/coro_rpc/coro_rpc_doc.hpp
+++ b/website/docs/zh/coro_rpc/coro_rpc_doc.hpp
@@ -135,7 +135,7 @@ class coro_rpc_server {
    * @param self 成员函数对应的对象指针
    */
   template <auto first, auto... func>
-  void register_handler(class_type_t<decltype(first)> *self);
+  void register_handler(util::class_type_t<decltype(first)> *self);
 };
 
 /*!
@@ -229,7 +229,8 @@ class coro_rpc_client {
    * @return rpc调用结果
    */
   template <auto func, typename... Args>
-  async_simple::coro::Lazy<rpc_result<function_return_type_t<decltype(func)>>>
+  async_simple::coro::Lazy<
+      rpc_result<util::function_return_type_t<decltype(func)>>>
   call(Args &&...args);
 
   /*!
@@ -241,7 +242,8 @@ class coro_rpc_client {
    * @return rpc调用结果
    */
   template <auto func, typename... Args>
-  async_simple::coro::Lazy<rpc_result<function_return_type_t<decltype(func)>>>
+  async_simple::coro::Lazy<
+      rpc_result<util::function_return_type_t<decltype(func)>>>
   call_for(const auto &duration, Args &&...args);
 
   /*!