diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6a83176..9ccb6ab 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -348,6 +348,7 @@ tile_add_test(fiber_detail_scheduler_test "tile/fiber/detail/scheduler_test.cc")
   tile_add_test(base_internal_logging_test "tile/base/internal/logging_test.cc")
   tile_add_test(base_chrono_test "tile/base/chrono_test.cc")
   tile_add_test(init_override_flag_test "tile/init/override_flag_test.cc")
+  # tile_add_test("custom_http_client_test" "tests/http_client_test.cc")
   # tile_add_test(base_internal_time_keeper_test
   # "tile/base/internal/time_keeper_test.cc")
 endif(TILE_BUILD_TESTS)
diff --git a/tests/http_client_test.cc b/tests/http_client_test.cc
new file mode 100644
index 0000000..985050e
--- /dev/null
+++ b/tests/http_client_test.cc
@@ -0,0 +1,47 @@
+#include "tile/net/http/http_client.h"
+
+#include "gtest/gtest.h"
+
+const std::string url = "http://127.0.0.1:8000/";
+
+TEST(HttpClient, Request) {
+  tile::HttpClient client;
+  std::vector<tile::Future<
+      std::expected<tile::HttpResponse, tile::HttpClient::ErrorCode>>>
+      v;
+  tile::HttpClient::RequestOptions options;
+  options.timeout = std::chrono::seconds(20);
+
+  std::atomic<int> count{0};
+
+  for (int i = 0; i != 1000; ++i) {
+    for (auto code : tile::AllHttpStatus) {
+      if (static_cast<int>(code) < 200) {
+        continue;
+      }
+
+      v.emplace_back(
+          client.AsyncGet(url + std::to_string(static_cast<int>(code)), options)
+              .Then([&](std::expected<tile::HttpResponse,
+                                      tile::HttpClient::ErrorCode> &&res) {
+                int cnt = count.fetch_add(1) + 1;
+                TILE_LOG_INFO_EVERY_SECOND("complete {}", cnt);
+                return res;
+              }));
+    }
+  }
+
+  int j = 0;
+  for (int i = 0; i != 1000; ++i) {
+    for (auto &code : tile::AllHttpStatus) {
+      if (static_cast<int>(code) < 200) {
+        continue;
+      }
+
+      auto resp = tile::future::BlockingGet(std::move(v[j++]));
+
+      EXPECT_TRUE(resp) << tile::HttpClient::ErrorCodeToString(resp.error());
+      EXPECT_EQ(resp->status(), code);
+    }
+  }
+}
diff --git a/tests/http_server.py b/tests/http_server.py
new file mode 100644
index 0000000..446730c
--- /dev/null
+++ b/tests/http_server.py
@@ -0,0 +1,24 @@
+#!/usr/bin/python3
+import http.server
+import socket
+import socketserver
+from http.server import HTTPServer, BaseHTTPRequestHandler
+
+PORT = 8000
+
+class Request(BaseHTTPRequestHandler):
+    def do_GET(self):
+        code = int(self.path.split("/")[1])
+        
+        self.send_response(code)
+        self.send_header('Content-type', 'text/plain')
+        self.end_headers()
+
+class HTTPServer(socketserver.TCPServer):
+    def server_bind(self):
+        self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+        self.socket.bind(self.server_address)
+
+Handler = http.server.SimpleHTTPRequestHandler
+with HTTPServer(("", PORT), Request) as httpd:
+    httpd.serve_forever()
diff --git a/tile/init.cc b/tile/init.cc
index e280072..4afaccf 100644
--- a/tile/init.cc
+++ b/tile/init.cc
@@ -53,31 +53,18 @@ int Start(int argc, char **argv, std::function<int(int, char **)> cb,
     google::InstallFailureSignalHandler();
   }
 
-  // Init gflags
   gflags::SetVersionString("0.1.0");
   gflags::ParseCommandLineFlags(&argc, &argv, true);
   detail::ApplyFlagOverrider();
-  auto gflags_handler = tile::make_unique_with_deleter<uint32_t>(
-      [](void *) { gflags::ShutDownCommandLineFlags(); });
 
-  // Init Glog
   google::InitGoogleLogging(argv[0]);
-  auto glog_handler = tile::make_unique_with_deleter<uint32_t>(
-      [](void *) { google::ShutdownGoogleLogging(); });
 
   TILE_LOG_INFO("Tile started.");
 
   TILE_PCHECK(signal(SIGPIPE, SIG_IGN) != SIG_ERR);
 
-  // Init BasicRuntime
   InitializeBasicRuntime();
-  auto basic_runtime_handler = tile::make_unique_with_deleter<uint32_t>(
-      [](void *) { TerminateBasicRuntime(); });
-
-  // Run all initializers
   detail::RunAllInitializers();
-  auto initializers_handler = tile::make_unique_with_deleter<uint32_t>(
-      [](void *) { detail::RunAllInitializers(); });
 
   int rc = 0;
 
@@ -100,9 +87,9 @@ int Start(int argc, char **argv, std::function<int(int, char **)> cb,
     worker.join();
   }
 
-  // detail::RunAllFinalizers();
-  // TerminateBasicRuntime();
-  // gflags::ShutDownCommandLineFlags();
+  detail::RunAllFinalizers();
+  TerminateBasicRuntime();
+  gflags::ShutDownCommandLineFlags();
   TILE_LOG_INFO("Exited");
 
   return rc;
diff --git a/tile/init/on_init.cc b/tile/init/on_init.cc
index 7f0fbfa..3ad04b0 100644
--- a/tile/init/on_init.cc
+++ b/tile/init/on_init.cc
@@ -83,6 +83,7 @@ void RegisterOnInitCallback(std::int32_t priority, std::function<void()> init,
       !registry_prepared.load(std::memory_order_relaxed),
       "Callbacks may only be registered before `tile::Start()` is called");
   auto &&registry = *GetStagingRegistry();
+  TILE_CHECK(init != nullptr, "Initializer must be provided");
   registry[priority].push_back({std::move(init), std::move(fini)});
 }
 
diff --git a/tile/net/http/http_client.cc b/tile/net/http/http_client.cc
index 924500a..ade386f 100644
--- a/tile/net/http/http_client.cc
+++ b/tile/net/http/http_client.cc
@@ -49,10 +49,15 @@ HttpClient::ErrorCode GetErrorCodeFromCurlCode(int c) {
     return HttpClient::ERROR_IO;
   case CURLE_TOO_MANY_REDIRECTS:
     return HttpClient::ERROR_TOO_MANY_REDIRECTS;
-  default:
-    TILE_LOG_WARNING_EVERY_SECOND("ERROR_UNKNOWN CURLcode {}", c);
+  case CURLE_GOT_NOTHING:
+    return HttpClient::ERROR_GET_NOTHING;
+
+  default: {
+    TILE_LOG_WARNING_EVERY_SECOND("ERROR_UNKNOWN CURLcode {}, curl msg: ", c,
+                                  curl_easy_strerror(static_cast<CURLcode>(c)));
     return HttpClient::ERROR_UNKNOWN;
   }
+  }
 }
 
 long TileHttpVersionToCurlHttpVersion(HttpVersion v,
@@ -446,6 +451,8 @@ const char *HttpClient::ErrorCodeToString(int error_code) {
     return "ERROR_INTERNAL_ERROR";
   case ERROR_DRY_RUN:
     return "ERROR_DRY_RUN";
+  case ERROR_GET_NOTHING:
+    return "ERROR_GET_NOTHING";
   case ERROR_UNKNOWN:
     return "<Unknown>";
   }
diff --git a/tile/net/http/http_client.h b/tile/net/http/http_client.h
index f9057f7..77eea63 100644
--- a/tile/net/http/http_client.h
+++ b/tile/net/http/http_client.h
@@ -11,6 +11,8 @@
 
 #include "gflags/gflags_declare.h"
 
+#include <ostream>
+
 DECLARE_int32(tile_http_client_default_timeout_ms);
 
 namespace tile {
@@ -45,6 +47,7 @@ public:
     ERROR_IO,
     ERROR_INTERNAL_ERROR,
     ERROR_DRY_RUN,
+    ERROR_GET_NOTHING,
     ERROR_UNKNOWN = 100,
   };
 
diff --git a/tile/net/http/types.h b/tile/net/http/types.h
index 7a9aa91..317181e 100644
--- a/tile/net/http/types.h
+++ b/tile/net/http/types.h
@@ -79,6 +79,28 @@ enum class HttpStatus { // `HttpStatusCode`?
   NetworkAuthenticationRequired = 511
 };
 
+// AllHttpStatus for for_each
+static HttpStatus AllHttpStatus[] = {
+    HttpStatus::Continue,
+    HttpStatus::SwitchingProtocols,
+    HttpStatus::EarlyHints,
+    HttpStatus::OK,
+    HttpStatus::Created,
+    HttpStatus::Accepted,
+    HttpStatus::NonAuthoritativeInformation,
+    HttpStatus::NoContent,
+    HttpStatus::ResetContent,
+    HttpStatus::PartialContent,
+    HttpStatus::MultipleChoices,
+    HttpStatus::MovedPermanently,
+    HttpStatus::Found,
+    HttpStatus::SeeOther,
+    HttpStatus::NotModified,
+    HttpStatus::TemporaryRedirect,
+    HttpStatus::PermanentRedirect,
+    HttpStatus::BadRequest,
+};
+
 Slice ToSlice(HttpVersion method) noexcept;
 Slice ToSlice(HttpMethod) noexcept;
 Slice ToSlice(HttpStatus status) noexcept;