diff --git a/CMakeLists.txt b/CMakeLists.txt
index 576a396..d206d10 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -92,7 +92,7 @@ add_subdirectory("third_party/gflags")
 set(GFLAGS_USE_TARGET_NAMESPACE ON)
 set(gflags_DIR "${CMAKE_CURRENT_BINARY_DIR}/third_party/gflags")
 add_subdirectory("third_party/glog")
-add_subdirectory("third_party/context")
+# add_subdirectory("third_party/context")
 
 set(CURL_DISABLE_TESTS ON)
 set(CURL_CA_PATH
@@ -189,7 +189,7 @@ set(TILE_SRCS
     "tile/base/thread/scoped_lock.cc"
     "tile/base/thread/spinlock.cc"
     "tile/base/memory_barrier.cc"
-    "tile/fiber/detail/fiber.cc"
+    # "tile/fiber/detail/fiber.cc"
     "tile/io/detail/eintr_safe.cc"
     "tile/io/native/acceptor.cc"
     "tile/io/descriptor.cc"
@@ -238,7 +238,8 @@ target_include_directories(
 target_link_libraries(
   tile
   PUBLIC # -Wl,--start-group
-         nova_context zlib gflags::gflags glog::glog
+         # nova_context 
+         zlib gflags::gflags glog::glog
          jsoncpp_static
          # -Wl,--end-group
          libcurl fmt)
@@ -291,7 +292,7 @@ if(TILE_BUILD_TESTS)
   endmacro()
 
   tile_add_test(base_exposed_var_test "tile/base/exposed_var_test.cc")
-  tile_add_test(fiber_detail_scheduler_test "tile/fiber/detail/scheduler_test.cc")
+    #   tile_add_test(fiber_detail_scheduler_test "tile/fiber/detail/scheduler_test.cc")
   tile_add_test(base_internal_meta_test "tile/base/internal/meta_test.cc")
   # tile_add_test(net_internal_http_engine_test
   # "tile/net/internal/http_engine_test.cc")
@@ -380,7 +381,7 @@ if(TILE_BUILD_BENCHMARKS)
     target_sources(tile_bm_all PRIVATE ${benchmark_file})
   endmacro()
 
-tile_add_bm(fiber_detail_fiber_benchmark "tile/fiber/detail/fiber_benchmark.cc")
+    # tile_add_bm(fiber_detail_fiber_benchmark "tile/fiber/detail/fiber_benchmark.cc")
   tile_add_bm(base_casting_benchmark "tile/base/casting_benchmark.cc")
   tile_add_bm(base_thread_mutex_benchmark "tile/base/thread/mutex_benchmark.cc")
   tile_add_bm(base_encoding_benchmark "tile/base/encoding_benchmark.cc")
diff --git a/tile/net/internal/http_engine.cc b/tile/net/internal/http_engine.cc
index 2b12a2c..4296278 100644
--- a/tile/net/internal/http_engine.cc
+++ b/tile/net/internal/http_engine.cc
@@ -374,7 +374,7 @@ void HttpEngine::Join() {
 HttpEngine::HttpEngine() {
   auto ret = curl_global_init(CURL_GLOBAL_DEFAULT);
   TILE_CHECK(!ret, "Curl Init failed {}", ret);
-  for (auto i = 0; i < 1; ++i) {
+  for (auto i = 0; i < 5; ++i) {
     curl_client_groups.push_back(make_unique<CurlClientGroup>(
         FLAGS_tile_http_engine_workers_per_scheduling_group, i));
   }
diff --git a/tile/util/config.h b/tile/util/config.h
new file mode 100644
index 0000000..2c4a545
--- /dev/null
+++ b/tile/util/config.h
@@ -0,0 +1,65 @@
+#ifndef TILE_UTIL_CONFIG_H
+#define TILE_UTIL_CONFIG_H
+
+#pragma once
+
+#include "tile/base/ref_ptr.h"
+#include "tile/base/slice.h"
+#include <cstdint>
+
+namespace tile {
+namespace util {
+class Config : public RefCounted<Config> {
+public:
+  using Keys = std::vector<std::string>;
+  using Ptr = RefPtr<Config>;
+
+  bool Has(const Slice &key) const;
+
+#define TILE_DECLARE_CONFIG_GETTER(type, name)                                 \
+  type Get##name(const Slice &key) const;                                      \
+  type Get##name(const Slice &key, type default_value) const;
+
+#define TILE_DECLARE_CONFIG_SETTER(type, name)                                 \
+  virtual void Set##name(const Slice &key, type value);
+
+  std::string GetRawString(const Slice &key, const Slice &default_value) const;
+
+  // getters
+  TILE_DECLARE_CONFIG_GETTER(std::string, String)
+  TILE_DECLARE_CONFIG_GETTER(int, Int)
+  TILE_DECLARE_CONFIG_GETTER(unsigned int, UInt)
+  TILE_DECLARE_CONFIG_GETTER(int16_t, Int16)
+  TILE_DECLARE_CONFIG_GETTER(int32_t, Int32)
+  TILE_DECLARE_CONFIG_GETTER(int64_t, Int64)
+  TILE_DECLARE_CONFIG_GETTER(uint16_t, UInt16)
+  TILE_DECLARE_CONFIG_GETTER(uint32_t, UInt32)
+  TILE_DECLARE_CONFIG_GETTER(uint64_t, UInt64)
+  TILE_DECLARE_CONFIG_GETTER(double, Double)
+  TILE_DECLARE_CONFIG_GETTER(bool, Bool)
+
+protected:
+  // setters
+  TILE_DECLARE_CONFIG_SETTER(const std::string &, String)
+  TILE_DECLARE_CONFIG_SETTER(int, Int)
+  TILE_DECLARE_CONFIG_SETTER(unsigned int, UInt)
+  TILE_DECLARE_CONFIG_SETTER(int16_t, Int16)
+  TILE_DECLARE_CONFIG_SETTER(int32_t, Int32)
+  TILE_DECLARE_CONFIG_SETTER(int64_t, Int64)
+  TILE_DECLARE_CONFIG_SETTER(uint16_t, UInt16)
+  TILE_DECLARE_CONFIG_SETTER(uint32_t, UInt32)
+  TILE_DECLARE_CONFIG_SETTER(uint64_t, UInt64)
+  TILE_DECLARE_CONFIG_SETTER(double, Double)
+  TILE_DECLARE_CONFIG_SETTER(bool, Bool)
+
+#undef TILE_DECLARE_CONFIG_GETTER
+#undef TILE_DECLARE_CONFIG_SETTER
+
+  void Remove(const Slice &key);
+
+  Keys keys(const Slice &key_root = "") const;
+};
+} // namespace util
+} // namespace tile
+
+#endif // TILE_UTIL_CONFIG_H
diff --git a/tile/util/layerd_config.h b/tile/util/layerd_config.h
new file mode 100644
index 0000000..731f394
--- /dev/null
+++ b/tile/util/layerd_config.h
@@ -0,0 +1,25 @@
+#ifndef TILE_UTIL_LAYERD_CONFIG_H
+#define TILE_UTIL_LAYERD_CONFIG_H
+
+#pragma once
+
+#include "tile/util/config.h"
+
+namespace tile {
+namespace util {
+class LayerdConfig : public Config {
+public:
+protected:
+  struct ConfigItem {
+    Config::Ptr cfg;
+    // 1 < 2 < 3 < 4 ...
+    int priority;
+    // can remove or set new?
+    bool writeable;
+    std::string label;
+  };
+};
+} // namespace util
+} // namespace tile
+
+#endif // TILE_UTIL_LAYERD_CONFIG_H