diff --git a/include/ylt/thirdparty/cinatra/coro_http_connection.hpp b/include/ylt/thirdparty/cinatra/coro_http_connection.hpp
index 346aa3b95..b1b36180d 100644
--- a/include/ylt/thirdparty/cinatra/coro_http_connection.hpp
+++ b/include/ylt/thirdparty/cinatra/coro_http_connection.hpp
@@ -108,7 +108,7 @@ class coro_http_connection
       auto [ec, size] = co_await async_read_until(head_buf_, TWO_CRCF);
       if (ec) {
         if (ec != asio::error::eof) {
-          CINATRA_LOG_ERROR << "read http header error: " << ec.message();
+          CINATRA_LOG_WARNING << "read http header error: " << ec.message();
         }
         close();
         break;
diff --git a/include/ylt/thirdparty/cinatra/coro_http_server.hpp b/include/ylt/thirdparty/cinatra/coro_http_server.hpp
index 6225325db..b2ceddf04 100644
--- a/include/ylt/thirdparty/cinatra/coro_http_server.hpp
+++ b/include/ylt/thirdparty/cinatra/coro_http_server.hpp
@@ -13,6 +13,7 @@
 #include "cinatra/mime_types.hpp"
 #include "cinatra_log_wrapper.hpp"
 #include "coro_http_connection.hpp"
+#include "ylt/coro_io/coro_file.hpp"
 #include "ylt/coro_io/coro_io.hpp"
 #include "ylt/coro_io/io_context_pool.hpp"
 
diff --git a/include/ylt/thirdparty/frozen/bits/pmh.h b/include/ylt/thirdparty/frozen/bits/pmh.h
index 801f25433..24b38a07f 100644
--- a/include/ylt/thirdparty/frozen/bits/pmh.h
+++ b/include/ylt/thirdparty/frozen/bits/pmh.h
@@ -138,7 +138,7 @@ struct seed_or_index {
 
  private:
   static constexpr value_type MINUS_ONE =
-      std::numeric_limits<value_type>::max();
+      (std::numeric_limits<value_type>::max)();
   static constexpr value_type HIGH_BIT = ~(MINUS_ONE >> 1);
 
   value_type value_ = 0;
@@ -201,7 +201,7 @@ pmh_tables<M, Hash> constexpr make_pmh_tables(const carray<Item, N> &items,
   carray<seed_or_index, M> G;  // Default constructed to "index 0"
 
   // H becomes the second hash table in the resulting pmh function
-  constexpr std::size_t UNUSED = std::numeric_limits<std::size_t>::max();
+  constexpr std::size_t UNUSED = (std::numeric_limits<std::size_t>::max)();
   carray<std::size_t, M> H;
   H.fill(UNUSED);
 
diff --git a/include/ylt/thirdparty/frozen/random.h b/include/ylt/thirdparty/frozen/random.h
index 8089ecd8e..cbdcdcbdc 100644
--- a/include/ylt/thirdparty/frozen/random.h
+++ b/include/ylt/thirdparty/frozen/random.h
@@ -66,11 +66,11 @@ class linear_congruential_engine {
     state_ = modulo(tmp, std::integral_constant<UIntType, modulus>());
     return state_;
   }
-  constexpr void discard(unsigned long long n) {
-    while (n--) operator()();
-  }
-  static constexpr result_type min() { return increment == 0u ? 1u : 0u; }
-  static constexpr result_type max() { return modulus - 1u; }
+  // constexpr void discard(unsigned long long n) {
+  //   while (n--) operator()();
+  // }
+  // static constexpr result_type min() { return increment == 0u ? 1u : 0u; }
+  // static constexpr result_type max() { return modulus - 1u; }
   friend constexpr bool operator==(linear_congruential_engine const &self,
                                    linear_congruential_engine const &other) {
     return self.state_ == other.state_;
diff --git a/include/ylt/thirdparty/iguana/detail/fast_float.h b/include/ylt/thirdparty/iguana/detail/fast_float.h
index 0c32c0743..ddc7f9e4a 100644
--- a/include/ylt/thirdparty/iguana/detail/fast_float.h
+++ b/include/ylt/thirdparty/iguana/detail/fast_float.h
@@ -2708,7 +2708,7 @@ fastfloat_really_inline void round(adjusted_mantissa& am,
   if (-am.power2 >= mantissa_shift) {
     // have a denormal float
     int32_t shift = -am.power2 + 1;
-    cb(am, std::min(shift, 64));
+    cb(am, (std::min)(shift, 64));
     // check for round-up: if rounding-nearest carried us to the hidden bit.
     am.power2 = (am.mantissa <
                  (uint64_t(1) << binary_format<T>::mantissa_explicit_bits()))
diff --git a/src/coro_http/examples/CMakeLists.txt b/src/coro_http/examples/CMakeLists.txt
index 7d87880f2..81029f1f2 100644
--- a/src/coro_http/examples/CMakeLists.txt
+++ b/src/coro_http/examples/CMakeLists.txt
@@ -29,8 +29,10 @@ endif()
 
 add_executable(coro_http_example example.cpp)
 add_executable(coro_http_channel channel.cpp)
+add_executable(coro_chat_room chat_room.cpp)
 
 if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND CMAKE_SYSTEM_NAME MATCHES "Windows") # mingw-w64
     target_link_libraries(coro_http_example wsock32 ws2_32)
     target_link_libraries(coro_http_channel wsock32 ws2_32)
+    target_link_libraries(coro_chat_room wsock32 ws2_32)
 endif()
\ No newline at end of file
diff --git a/src/coro_http/examples/chat_room.cpp b/src/coro_http/examples/chat_room.cpp
new file mode 100644
index 000000000..bbb84a615
--- /dev/null
+++ b/src/coro_http/examples/chat_room.cpp
@@ -0,0 +1,126 @@
+#include <algorithm>
+#include <cstdint>
+#include <iostream>
+#include <mutex>
+#include <string>
+#include <string_view>
+#include <unordered_map>
+#include <vector>
+
+#include "async_simple/coro/Lazy.h"
+#include "ylt/coro_http/coro_http_server.hpp"
+#include "ylt/struct_json/json_reader.h"
+#include "ylt/struct_json/json_writer.h"
+
+using namespace coro_http;
+
+struct login_info_t {
+  std::string_view type;
+  std::string_view content;
+  std::vector<std::string> user_list;
+};
+REFLECTION(login_info_t, type, content, user_list);
+
+using logout_info_t = login_info_t;
+
+struct user_info_t {
+  std::string_view type;
+  std::string_view from;
+  std::string_view content;
+};
+REFLECTION(user_info_t, type, from, content);
+
+struct message_t {
+  std::string type;
+  std::string_view content;
+};
+REFLECTION(message_t, type, content);
+
+async_simple::coro::Lazy<void> broadcast(auto &conn_map,
+                                         std::string &resp_str) {
+  for (auto &[conn_ptr, user_name] : conn_map) {
+    auto conn = (coro_http_connection *)conn_ptr;
+    auto ec = co_await conn->write_websocket(resp_str);
+    if (ec) {
+      std::cout << ec.message() << "\n";
+      continue;
+    }
+  }
+  resp_str.clear();
+}
+
+int main() {
+  coro_http::coro_http_server server(1, 9001);
+  std::mutex mtx;
+  std::unordered_map<intptr_t, std::string> conn_map;
+  server.set_http_handler<cinatra::GET>(
+      "/",
+      [&](coro_http_request &req,
+          coro_http_response &resp) -> async_simple::coro::Lazy<void> {
+        websocket_result result{};
+
+        std::unordered_map<intptr_t, std::string> map;
+        std::string resp_str;
+        while (true) {
+          result = co_await req.get_conn()->read_websocket();
+          if (result.ec) {
+            break;
+          }
+
+          message_t msg{};
+          if (result.type == ws_frame_type::WS_CLOSE_FRAME) {
+            std::cout << "close frame\n";
+            msg.type = "logout";
+          }
+          else {
+            struct_json::from_json(msg, result.data);
+          }
+
+          if (msg.type == "user") {
+            std::string from;
+            {
+              std::scoped_lock lock(mtx);
+              from = conn_map.at((intptr_t)req.get_conn());
+              map = conn_map;
+            }
+
+            user_info_t info{msg.type, from, msg.content};
+            struct_json::to_json(info, resp_str);
+          }
+          else if (msg.type == "login" || msg.type == "logout") {
+            std::string user_name;
+
+            {
+              std::scoped_lock lock(mtx);
+              if (msg.type == "login") {
+                user_name = std::string{msg.content};
+                conn_map.emplace((intptr_t)req.get_conn(), user_name);
+              }
+              else {
+                user_name = conn_map.at((intptr_t)req.get_conn());
+                conn_map.erase((intptr_t)req.get_conn());
+              }
+              map = conn_map;
+            }
+
+            if (!map.empty()) {
+              std::vector<std::string> user_list;
+              std::transform(map.begin(), map.end(),
+                             std::back_inserter(user_list), [](auto &kv) {
+                               return kv.second;
+                             });
+              logout_info_t info{msg.type, user_name, std::move(user_list)};
+              struct_json::to_json(info, resp_str);
+            }
+          }
+
+          std::cout << result.data << "\n";
+
+          co_await broadcast(map, resp_str);
+          if (msg.type == "logout") {
+            break;
+          }
+        }
+      });
+  server.sync_start();
+}
\ No newline at end of file
diff --git a/src/coro_http/examples/client.html b/src/coro_http/examples/client.html
new file mode 100644
index 000000000..d0736ca77
--- /dev/null
+++ b/src/coro_http/examples/client.html
@@ -0,0 +1,156 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+    <title></title>
+    <meta http-equiv="content-type" content="text/html;charset=utf-8">
+    <style>
+        p {
+            text-align: left;
+            padding-left: 20px;
+        }
+    </style>
+</head>
+
+<body>
+    <div style="width: 800px;height: 600px;margin: 30px auto;text-align: center">
+        <h1>基于C++20 协程的websocket聊天室</h1>
+        <div style="width: 800px;border: 1px solid gray;height: 300px;">
+            <div style="width: 200px;height: 300px;float: left;text-align: left;">
+                <p><span>当前在线:</span><span id="user_num">0</span></p>
+                <div id="user_list" style="overflow: auto;">
+
+                </div>
+            </div>
+            <div id="msg_list"
+                style="width: 598px;border:  1px solid gray; height: 300px;overflow: scroll;float: left;">
+            </div>
+        </div>
+        <br>
+        <textarea id="msg_box" rows="6" cols="50" onkeydown="confirm(event)"></textarea><br>
+        <input type="button" value="发送" onclick="send()">
+    </div>
+</body>
+
+</html>
+
+<script type="text/javascript">
+    var uname = prompt('请输入用户名', 'user' + uuid(8, 16));
+    var ws = new WebSocket("ws://127.0.0.1:9001/");
+    ws.onopen = function () {
+        var data = "系统消息：建立连接成功";
+        let user_info = { 'type': 'login', 'content': uname };
+        sendMsg(user_info);
+    };
+
+    ws.onmessage = function (e) {
+        var msg = JSON.parse(e.data);
+        var sender, user_name, name_list, change_type;
+
+        switch (msg.type) {
+            case 'user':
+                sender = '<b style="color:green;">' + msg.from + '说: ' + '</b>';
+                break;
+            case 'login':
+            case 'logout':
+                user_name = msg.content;
+                name_list = msg.user_list;
+                change_type = msg.type;
+                dealUser(user_name, change_type, name_list);
+                return;
+        }
+
+        var data = sender + msg.content;
+        listMsg(data);
+    };
+
+    ws.onerror = function () {
+        var data = "系统消息 : 出错了,请退出重试.";
+        listMsg(data);
+    };
+
+    function confirm(event) {
+        var key_num = event.keyCode;
+        if (13 == key_num) {
+            send();
+        } else {
+            return false;
+        }
+    }
+
+    function send() {
+        var msg_box = document.getElementById("msg_box");
+        var content = msg_box.value;
+        var reg = new RegExp("\r\n", "g");
+        content = content.replace(reg, "");
+        var msg = { 'type': 'user', 'content': content.trim() };
+        sendMsg(msg);
+        msg_box.value = '';
+    }
+
+    function listMsg(data) {
+        var msg_list = document.getElementById("msg_list");
+        var msg = document.createElement("p");
+
+        msg.innerHTML = data;
+        msg_list.appendChild(msg);
+        msg_list.scrollTop = msg_list.scrollHeight;
+    }
+
+    /**
+     * 处理用户登陆消息
+     *
+     * @param user_name 用户名
+     * @param type  login/logout
+     * @param name_list 用户列表
+     */
+    function dealUser(user_name, type, name_list) {
+        var user_list = document.getElementById("user_list");
+        var user_num = document.getElementById("user_num");
+        while (user_list.hasChildNodes()) {
+            user_list.removeChild(user_list.firstChild);
+        }
+
+        for (var index in name_list) {
+            var user = document.createElement("p");
+            user.innerHTML = name_list[index];
+            user_list.appendChild(user);
+        }
+        user_num.innerHTML = name_list.length;
+        user_list.scrollTop = user_list.scrollHeight;
+
+        var change = type == 'login' ? '上线' : '下线';
+
+        var data = '<b style="color:red;">系统消息</b>: ' + user_name + ' 已' + change;
+        listMsg(data);
+    }
+
+    function sendMsg(msg) {
+        var data = JSON.stringify(msg);
+        ws.send(data);
+    }
+
+    function uuid(len, radix) {
+        var chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('');
+        var uuid = [], i;
+        radix = radix || chars.length;
+
+        if (len) {
+            for (i = 0; i < len; i++) uuid[i] = chars[0 | Math.random() * radix];
+        } else {
+            var r;
+
+            uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-';
+            uuid[14] = '4';
+
+            for (i = 0; i < 36; i++) {
+                if (!uuid[i]) {
+                    r = 0 | Math.random() * 16;
+                    uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r];
+                }
+            }
+        }
+
+        return uuid.join('');
+    }
+</script>
\ No newline at end of file