diff --git a/src/EventUtils.hh b/src/EventUtils.hh
index ba0cc80c..a109e531 100644
--- a/src/EventUtils.hh
+++ b/src/EventUtils.hh
@@ -4,5 +4,31 @@
 
 #include <functional>
 #include <memory>
+#include <mutex>
+#include <optional>
+#include <stdexcept>
 
 void forward_to_event_thread(std::shared_ptr<struct event_base> base, std::function<void()>&& fn);
+
+template <typename T>
+T call_on_event_thread(std::shared_ptr<struct event_base> base, std::function<T()>&& compute) {
+  std::optional<T> ret;
+  std::string exc_what;
+  std::mutex ret_lock;
+  std::condition_variable ret_cv;
+  std::unique_lock<std::mutex> g(ret_lock);
+  forward_to_event_thread(base, [&]() -> void {
+    std::lock_guard<std::mutex> g(ret_lock);
+    try {
+      ret = compute();
+    } catch (const std::exception& e) {
+      exc_what = e.what();
+    }
+    ret_cv.notify_one();
+  });
+  ret_cv.wait(g);
+  if (!ret.has_value()) {
+    throw std::runtime_error(exc_what);
+  }
+  return ret.value();
+}
diff --git a/src/HTTPServer.cc b/src/HTTPServer.cc
index 4e69de53..bcf8d5c0 100644
--- a/src/HTTPServer.cc
+++ b/src/HTTPServer.cc
@@ -10,6 +10,7 @@
 #include <string>
 #include <vector>
 
+#include "EventUtils.hh"
 #include "Loggers.hh"
 #include "ProxyServer.hh"
 #include "Server.hh"
@@ -164,7 +165,9 @@ const string& HTTPServer::get_url_param(
 
 HTTPServer::HTTPServer(shared_ptr<ServerState> state)
     : state(state),
-      http(evhttp_new(this->state->base.get()), evhttp_free) {
+      base(event_base_new(), event_base_free),
+      http(evhttp_new(this->base.get()), evhttp_free),
+      th(&HTTPServer::thread_fn, this) {
   evhttp_set_gencb(this->http.get(), this->dispatch_handle_request, this);
 }
 
@@ -193,11 +196,19 @@ void HTTPServer::add_socket(int fd) {
   evhttp_accept_socket(this->http.get(), fd);
 }
 
+void HTTPServer::schedule_stop() {
+  event_base_loopexit(this->base.get(), nullptr);
+}
+
+void HTTPServer::wait_for_stop() {
+  this->th.join();
+}
+
 void HTTPServer::dispatch_handle_request(struct evhttp_request* req, void* ctx) {
   reinterpret_cast<HTTPServer*>(ctx)->handle_request(req);
 }
 
-JSON HTTPServer::generate_quest_json(shared_ptr<const Quest> q) const {
+JSON HTTPServer::generate_quest_json_st(shared_ptr<const Quest> q) {
   if (!q) {
     return nullptr;
   }
@@ -215,7 +226,7 @@ JSON HTTPServer::generate_quest_json(shared_ptr<const Quest> q) const {
   });
 }
 
-JSON HTTPServer::generate_client_config_json(const Client::Config& config) const {
+JSON HTTPServer::generate_client_config_json_st(const Client::Config& config) {
   const char* drop_notifications_mode = "unknown";
   switch (config.get_drop_notification_mode()) {
     case Client::ItemDropNotificationMode::NOTHING:
@@ -255,7 +266,7 @@ JSON HTTPServer::generate_client_config_json(const Client::Config& config) const
   return ret;
 }
 
-JSON HTTPServer::generate_license_json(shared_ptr<const License> l) const {
+JSON HTTPServer::generate_license_json_st(shared_ptr<const License> l) {
   auto ret = JSON::dict({
       {"SerialNumber", l->serial_number},
       {"Flags", l->flags},
@@ -270,20 +281,20 @@ JSON HTTPServer::generate_license_json(shared_ptr<const License> l) const {
   return ret;
 };
 
-JSON HTTPServer::generate_game_client_json(shared_ptr<const Client> c) const {
+JSON HTTPServer::generate_game_client_json_st(shared_ptr<const Client> c, shared_ptr<const ItemNameIndex> item_name_index) {
   auto ret = JSON::dict({
       {"ID", c->id},
       {"RemoteAddress", render_sockaddr_storage(c->channel.remote_addr)},
       {"Version", name_for_enum(c->version())},
       {"SubVersion", c->sub_version},
-      {"Config", this->generate_client_config_json(c->config)},
+      {"Config", HTTPServer::generate_client_config_json_st(c->config)},
       {"Language", name_for_language_code(c->language())},
       {"LocationX", c->x},
       {"LocationZ", c->z},
       {"LocationFloor", c->floor},
       {"CanChat", c->can_chat},
   });
-  ret.emplace("license", c->license ? this->generate_license_json(c->license) : JSON(nullptr));
+  ret.emplace("license", c->license ? HTTPServer::generate_license_json_st(c->license) : JSON(nullptr));
   auto l = c->lobby.lock();
   if (l) {
     ret.emplace("LobbyID", l->lobby_id);
@@ -311,14 +322,14 @@ JSON HTTPServer::generate_game_client_json(shared_ptr<const Client> c) const {
       JSON items_json = JSON::list();
       for (size_t z = 0; z < p->inventory.num_items; z++) {
         const auto& item = p->inventory.items[z];
-        string description = this->state->describe_item(c->version(), item.data, false);
-        string data_str = item.data.hex();
         auto item_dict = JSON::dict({
             {"Flags", item.flags.load()},
-            {"Data", std::move(data_str)},
-            {"Description", std::move(description)},
+            {"Data", item.data.hex()},
             {"ItemID", item.data.id.load()},
         });
+        if (item_name_index) {
+          item_dict.emplace("Description", item_name_index->describe_item(item.data, false));
+        }
         items_json.emplace_back(std::move(item_dict));
       }
       ret.emplace("ATP", p->disp.stats.char_stats.atp.load());
@@ -419,7 +430,7 @@ JSON HTTPServer::generate_game_client_json(shared_ptr<const Client> c) const {
   return ret;
 }
 
-JSON HTTPServer::generate_proxy_client_json(shared_ptr<const ProxyServer::LinkedSession> ses) const {
+JSON HTTPServer::generate_proxy_client_json_st(shared_ptr<const ProxyServer::LinkedSession> ses) {
   struct LobbyPlayer {
     uint32_t guild_card_number = 0;
     uint64_t xb_user_id = 0;
@@ -459,7 +470,7 @@ JSON HTTPServer::generate_proxy_client_json(shared_ptr<const ProxyServer::Linked
       {"DCHardwareID", ses->hardware_id},
       {"RemoteGuildCardNumber", ses->remote_guild_card_number},
       {"RemoteClientConfigData", format_data_string(&ses->remote_client_config_data[0], ses->remote_client_config_data.size())},
-      {"Config", this->generate_client_config_json(ses->config)},
+      {"Config", HTTPServer::generate_client_config_json_st(ses->config)},
       {"Language", name_for_language_code(ses->language())},
       {"LobbyClientID", ses->lobby_client_id},
       {"LeaderClientID", ses->leader_client_id},
@@ -487,11 +498,11 @@ JSON HTTPServer::generate_proxy_client_json(shared_ptr<const ProxyServer::Linked
       ret.emplace("DropMode", "proxy");
       break;
   }
-  ret.emplace("License", ses->license ? this->generate_license_json(ses->license) : JSON(nullptr));
+  ret.emplace("License", ses->license ? HTTPServer::generate_license_json_st(ses->license) : JSON(nullptr));
   return ret;
 }
 
-JSON HTTPServer::generate_lobby_json(shared_ptr<const Lobby> l) const {
+JSON HTTPServer::generate_lobby_json_st(shared_ptr<const Lobby> l, shared_ptr<const ItemNameIndex> item_name_index) {
   std::array<std::shared_ptr<Client>, 12> clients;
 
   auto client_ids_json = JSON::list();
@@ -569,23 +580,23 @@ JSON HTTPServer::generate_lobby_json(shared_ptr<const Lobby> l) const {
       for (size_t floor = 0; floor < l->floor_item_managers.size(); floor++) {
         for (const auto& it : l->floor_item_managers[floor].items) {
           const auto& item = it.second;
-          string description = this->state->describe_item(l->base_version, item->data, false);
-          string data_str = item->data.hex();
           auto item_dict = JSON::dict({
               {"LocationFloor", floor},
               {"LocationX", item->x},
               {"LocationZ", item->z},
               {"DropNumber", item->drop_number},
               {"VisibilityFlags", item->visibility_flags},
-              {"Data", std::move(data_str)},
-              {"Description", std::move(description)},
+              {"Data", item->data.hex()},
               {"ItemID", item->data.id.load()},
           });
+          if (item_name_index) {
+            item_dict.emplace("Description", item_name_index->describe_item(item->data, false));
+          }
           floor_items_json.emplace_back(std::move(item_dict));
         }
       }
       ret.emplace("FloorItems", std::move(floor_items_json));
-      ret.emplace("Quest", this->generate_quest_json(l->quest));
+      ret.emplace("Quest", HTTPServer::generate_quest_json_st(l->quest));
 
     } else {
       ret.emplace("BattleInProgress", l->check_flag(Lobby::Flag::BATTLE_IN_PROGRESS));
@@ -691,119 +702,130 @@ JSON HTTPServer::generate_lobby_json(shared_ptr<const Lobby> l) const {
 }
 
 JSON HTTPServer::generate_game_server_clients_json() const {
-  JSON res = JSON::list();
-  for (const auto& it : this->state->channel_to_client) {
-    res.emplace_back(this->generate_game_client_json(it.second));
-  }
-  return res;
+  return call_on_event_thread<JSON>(this->state->base, [&]() {
+    auto res = JSON::list();
+    for (const auto& it : this->state->channel_to_client) {
+      res.emplace_back(this->generate_game_client_json_st(it.second, this->state->item_name_index_opt(it.second->version())));
+    }
+    return res;
+  });
 }
 
 JSON HTTPServer::generate_proxy_server_clients_json() const {
-  JSON res = JSON::list();
-  for (const auto& it : this->state->proxy_server->all_sessions()) {
-    res.emplace_back(this->generate_proxy_client_json(it.second));
-  }
-  return res;
+  return call_on_event_thread<JSON>(this->state->base, [&]() {
+    JSON res = JSON::list();
+    for (const auto& it : this->state->proxy_server->all_sessions()) {
+      res.emplace_back(this->generate_proxy_client_json_st(it.second));
+    }
+    return res;
+  });
 }
 
 JSON HTTPServer::generate_server_info_json() const {
-  size_t game_count = 0;
-  size_t lobby_count = 0;
-  for (const auto& it : this->state->id_to_lobby) {
-    if (it.second->is_game()) {
-      game_count++;
-    } else {
-      lobby_count++;
+  return call_on_event_thread<JSON>(this->state->base, [&]() {
+    size_t game_count = 0;
+    size_t lobby_count = 0;
+    for (const auto& it : this->state->id_to_lobby) {
+      if (it.second->is_game()) {
+        game_count++;
+      } else {
+        lobby_count++;
+      }
     }
-  }
-  uint64_t uptime_usecs = now() - this->state->creation_time;
-  return JSON::dict({
-      {"StartTimeUsecs", this->state->creation_time},
-      {"StartTime", format_time(this->state->creation_time)},
-      {"UptimeUsecs", uptime_usecs},
-      {"Uptime", format_duration(uptime_usecs)},
-      {"LobbyCount", lobby_count},
-      {"GameCount", game_count},
-      {"ClientCount", this->state->channel_to_client.size()},
-      {"ProxySessionCount", this->state->proxy_server->num_sessions()},
-      {"ServerName", this->state->name},
+    uint64_t uptime_usecs = now() - this->state->creation_time;
+    return JSON::dict({
+        {"StartTimeUsecs", this->state->creation_time},
+        {"StartTime", format_time(this->state->creation_time)},
+        {"UptimeUsecs", uptime_usecs},
+        {"Uptime", format_duration(uptime_usecs)},
+        {"LobbyCount", lobby_count},
+        {"GameCount", game_count},
+        {"ClientCount", this->state->channel_to_client.size()},
+        {"ProxySessionCount", this->state->proxy_server->num_sessions()},
+        {"ServerName", this->state->name},
+    });
   });
 }
 
 JSON HTTPServer::generate_lobbies_json() const {
-  JSON res = JSON::list();
-  for (const auto& it : this->state->id_to_lobby) {
-    res.emplace_back(this->generate_lobby_json(it.second));
-  }
-  return res;
+  return call_on_event_thread<JSON>(this->state->base, [&]() {
+    JSON res = JSON::list();
+    for (const auto& it : this->state->id_to_lobby) {
+      res.emplace_back(this->generate_lobby_json_st(it.second, this->state->item_name_index_opt(it.second->base_version)));
+    }
+    return res;
+  });
 }
 
 JSON HTTPServer::generate_summary_json() const {
-  auto clients_json = JSON::list();
-  for (const auto& it : this->state->channel_to_client) {
-    auto c = it.second;
-    auto p = c->character(false, false);
-    auto l = c->lobby.lock();
-    clients_json.emplace_back(JSON::dict({
-        {"ID", c->id},
-        {"SerialNumber", c->license ? c->license->serial_number : JSON(nullptr)},
-        {"Name", p ? p->disp.name.decode(it.second->language()) : JSON(nullptr)},
-        {"Version", name_for_enum(it.second->version())},
-        {"Language", name_for_language_code(it.second->language())},
-        {"Level", p ? p->disp.stats.level + 1 : JSON(nullptr)},
-        {"Class", p ? name_for_char_class(p->disp.visual.char_class) : JSON(nullptr)},
-        {"SectionID", p ? name_for_section_id(p->disp.visual.section_id) : JSON(nullptr)},
-        {"LobbyID", l ? l->lobby_id : JSON(nullptr)},
-    }));
-  }
-
-  auto proxy_clients_json = JSON::list();
-  for (const auto& it : this->state->proxy_server->all_sessions()) {
-    proxy_clients_json.emplace_back(JSON::dict({
-        {"SerialNumber", it.second->license ? it.second->license->serial_number : JSON(nullptr)},
-        {"Name", it.second->character_name},
-        {"Version", name_for_enum(it.second->version())},
-        {"Language", name_for_language_code(it.second->language())},
-    }));
-  }
-
-  auto games_json = JSON::list();
-  for (const auto& it : this->state->id_to_lobby) {
-    auto l = it.second;
-    if (l->is_game()) {
-      auto game_json = JSON::dict({
-          {"ID", l->lobby_id},
-          {"Name", l->name},
-          {"BaseVersion", name_for_enum(l->base_version)},
-          {"Players", l->count_clients()},
-          {"CheatsEnabled", l->check_flag(Lobby::Flag::CHEATS_ENABLED)},
-          {"Episode", name_for_episode(l->episode)},
-          {"HasPassword", !l->password.empty()},
-      });
-      if (l->episode == Episode::EP3) {
-        auto ep3s = l->ep3_server;
-        game_json.emplace("BattleInProgress", l->check_flag(Lobby::Flag::BATTLE_IN_PROGRESS));
-        game_json.emplace("IsSpectatorTeam", l->check_flag(Lobby::Flag::IS_SPECTATOR_TEAM));
-        game_json.emplace("MapNumber", (ep3s && ep3s->last_chosen_map) ? ep3s->last_chosen_map->map_number : JSON(nullptr));
-        game_json.emplace("Rules", (ep3s && ep3s->map_and_rules) ? ep3s->map_and_rules->rules.json() : nullptr);
-      } else {
-        game_json.emplace("QuestInProgress", l->check_flag(Lobby::Flag::QUEST_IN_PROGRESS));
-        game_json.emplace("JoinableQuestInProgress", l->check_flag(Lobby::Flag::JOINABLE_QUEST_IN_PROGRESS));
-        game_json.emplace("SectionID", name_for_section_id(l->section_id));
-        game_json.emplace("Mode", name_for_mode(l->mode));
-        game_json.emplace("Difficulty", name_for_difficulty(l->difficulty));
-        game_json.emplace("Quest", this->generate_quest_json(l->quest));
-      }
-      games_json.emplace_back(std::move(game_json));
+  auto ret = call_on_event_thread<JSON>(this->state->base, [&]() {
+    auto clients_json = JSON::list();
+    for (const auto& it : this->state->channel_to_client) {
+      auto c = it.second;
+      auto p = c->character(false, false);
+      auto l = c->lobby.lock();
+      clients_json.emplace_back(JSON::dict({
+          {"ID", c->id},
+          {"SerialNumber", c->license ? c->license->serial_number : JSON(nullptr)},
+          {"Name", p ? p->disp.name.decode(it.second->language()) : JSON(nullptr)},
+          {"Version", name_for_enum(it.second->version())},
+          {"Language", name_for_language_code(it.second->language())},
+          {"Level", p ? p->disp.stats.level + 1 : JSON(nullptr)},
+          {"Class", p ? name_for_char_class(p->disp.visual.char_class) : JSON(nullptr)},
+          {"SectionID", p ? name_for_section_id(p->disp.visual.section_id) : JSON(nullptr)},
+          {"LobbyID", l ? l->lobby_id : JSON(nullptr)},
+      }));
     }
-  }
 
-  return JSON::dict({
-      {"Clients", std::move(clients_json)},
-      {"ProxyClients", std::move(proxy_clients_json)},
-      {"Games", std::move(games_json)},
-      {"Server", this->generate_server_info_json()},
+    auto proxy_clients_json = JSON::list();
+    for (const auto& it : this->state->proxy_server->all_sessions()) {
+      proxy_clients_json.emplace_back(JSON::dict({
+          {"SerialNumber", it.second->license ? it.second->license->serial_number : JSON(nullptr)},
+          {"Name", it.second->character_name},
+          {"Version", name_for_enum(it.second->version())},
+          {"Language", name_for_language_code(it.second->language())},
+      }));
+    }
+
+    auto games_json = JSON::list();
+    for (const auto& it : this->state->id_to_lobby) {
+      auto l = it.second;
+      if (l->is_game()) {
+        auto game_json = JSON::dict({
+            {"ID", l->lobby_id},
+            {"Name", l->name},
+            {"BaseVersion", name_for_enum(l->base_version)},
+            {"Players", l->count_clients()},
+            {"CheatsEnabled", l->check_flag(Lobby::Flag::CHEATS_ENABLED)},
+            {"Episode", name_for_episode(l->episode)},
+            {"HasPassword", !l->password.empty()},
+        });
+        if (l->episode == Episode::EP3) {
+          auto ep3s = l->ep3_server;
+          game_json.emplace("BattleInProgress", l->check_flag(Lobby::Flag::BATTLE_IN_PROGRESS));
+          game_json.emplace("IsSpectatorTeam", l->check_flag(Lobby::Flag::IS_SPECTATOR_TEAM));
+          game_json.emplace("MapNumber", (ep3s && ep3s->last_chosen_map) ? ep3s->last_chosen_map->map_number : JSON(nullptr));
+          game_json.emplace("Rules", (ep3s && ep3s->map_and_rules) ? ep3s->map_and_rules->rules.json() : nullptr);
+        } else {
+          game_json.emplace("QuestInProgress", l->check_flag(Lobby::Flag::QUEST_IN_PROGRESS));
+          game_json.emplace("JoinableQuestInProgress", l->check_flag(Lobby::Flag::JOINABLE_QUEST_IN_PROGRESS));
+          game_json.emplace("SectionID", name_for_section_id(l->section_id));
+          game_json.emplace("Mode", name_for_mode(l->mode));
+          game_json.emplace("Difficulty", name_for_difficulty(l->difficulty));
+          game_json.emplace("Quest", this->generate_quest_json_st(l->quest));
+        }
+        games_json.emplace_back(std::move(game_json));
+      }
+    }
+
+    return JSON::dict({
+        {"Clients", std::move(clients_json)},
+        {"ProxyClients", std::move(proxy_clients_json)},
+        {"Games", std::move(games_json)},
+    });
   });
+  ret.emplace("Server", this->generate_server_info_json());
+  return ret;
 }
 
 JSON HTTPServer::generate_all_json() const {
@@ -816,13 +838,18 @@ JSON HTTPServer::generate_all_json() const {
 }
 
 JSON HTTPServer::generate_ep3_cards_json(bool trial) const {
-  const auto& index = trial ? this->state->ep3_card_index_trial : this->state->ep3_card_index;
+  auto index = call_on_event_thread<shared_ptr<const Episode3::CardIndex>>(this->state->base, [&]() {
+    return trial ? this->state->ep3_card_index_trial : this->state->ep3_card_index;
+  });
   return index->definitions_json();
 }
 
 JSON HTTPServer::generate_rare_tables_json() const {
+  auto sets = call_on_event_thread<unordered_map<string, shared_ptr<const RareItemSet>>>(this->state->base, [&]() {
+    return this->state->rare_item_sets;
+  });
   JSON ret = JSON::list();
-  for (const auto& it : this->state->rare_item_sets) {
+  for (const auto& it : sets) {
     ret.emplace_back(it.first);
   }
   return ret;
@@ -830,25 +857,28 @@ JSON HTTPServer::generate_rare_tables_json() const {
 
 JSON HTTPServer::generate_rare_table_json(const std::string& table_name) const {
   try {
-    const auto& table = this->state->rare_item_sets.at(table_name);
-    shared_ptr<const ItemNameIndex> name_index;
-    if (ends_with(table_name, "-v1")) {
-      name_index = this->state->item_name_index(Version::DC_V1);
-    } else if (ends_with(table_name, "-v2")) {
-      name_index = this->state->item_name_index(Version::PC_V2);
-    } else if (ends_with(table_name, "-v3")) {
-      name_index = this->state->item_name_index(Version::GC_V3);
-    } else if (ends_with(table_name, "-v4")) {
-      name_index = this->state->item_name_index(Version::BB_V4);
-    }
-    return table->json(name_index);
+    auto colls = call_on_event_thread<pair<shared_ptr<const RareItemSet>, shared_ptr<const ItemNameIndex>>>(this->state->base, [&]() {
+      const auto& table = this->state->rare_item_sets.at(table_name);
+      shared_ptr<const ItemNameIndex> name_index;
+      if (ends_with(table_name, "-v1")) {
+        name_index = this->state->item_name_index_opt(Version::DC_V1);
+      } else if (ends_with(table_name, "-v2")) {
+        name_index = this->state->item_name_index_opt(Version::PC_V2);
+      } else if (ends_with(table_name, "-v3")) {
+        name_index = this->state->item_name_index_opt(Version::GC_V3);
+      } else if (ends_with(table_name, "-v4")) {
+        name_index = this->state->item_name_index_opt(Version::BB_V4);
+      }
+      return make_pair(table, name_index);
+    });
+    return colls.first->json(colls.second);
   } catch (const out_of_range&) {
     throw http_error(404, "table does not exist");
   }
 }
 
 void HTTPServer::handle_request(struct evhttp_request* req) {
-  JSON ret;
+  shared_ptr<const JSON> ret;
   uint32_t serialize_options = 0;
   try {
     string uri = evhttp_request_get_uri(req);
@@ -862,7 +892,10 @@ void HTTPServer::handle_request(struct evhttp_request* req) {
 
     static const string default_format_option = "false";
     if (this->get_url_param(query, "format", &default_format_option) == "true") {
-      serialize_options = JSON::SerializeOption::FORMAT | JSON::SerializeOption::SORT_DICT_KEYS;
+      serialize_options |= JSON::SerializeOption::FORMAT | JSON::SerializeOption::SORT_DICT_KEYS;
+    }
+    if (this->get_url_param(query, "hex", &default_format_option) == "true") {
+      serialize_options |= JSON::SerializeOption::HEX_INTEGERS;
     }
 
     if (uri == "/") {
@@ -870,6 +903,7 @@ void HTTPServer::handle_request(struct evhttp_request* req) {
           "/y/data/ep3-cards",
           "/y/data/ep3-cards-trial",
           "/y/data/rare-tables",
+          "/y/data/rare-tables/<TABLE-NAME>",
           "/y/data/config",
           "/y/clients",
           "/y/proxy-clients",
@@ -878,30 +912,30 @@ void HTTPServer::handle_request(struct evhttp_request* req) {
           "/y/summary",
           "/y/all",
       });
-      ret = JSON::dict({{"endpoints", std::move(endpoints_json)}});
+      ret = make_shared<JSON>(JSON::dict({{"endpoints", std::move(endpoints_json)}}));
 
     } else if (uri == "/y/data/ep3-cards") {
-      ret = this->generate_ep3_cards_json(false);
+      ret = make_shared<JSON>(this->generate_ep3_cards_json(false));
     } else if (uri == "/y/data/ep3-cards-trial") {
-      ret = this->generate_ep3_cards_json(true);
+      ret = make_shared<JSON>(this->generate_ep3_cards_json(true));
     } else if (uri == "/y/data/rare-tables") {
-      ret = this->generate_rare_tables_json();
+      ret = make_shared<JSON>(this->generate_rare_tables_json());
     } else if (!strncmp(uri.c_str(), "/y/data/rare-tables/", 20)) {
-      ret = this->generate_rare_table_json(uri.substr(20));
+      ret = make_shared<JSON>(this->generate_rare_table_json(uri.substr(20)));
     } else if (uri == "/y/data/config") {
-      ret = this->state->config_json;
+      ret = call_on_event_thread<shared_ptr<const JSON>>(this->state->base, [this]() { return this->state->config_json; });
     } else if (uri == "/y/clients") {
-      ret = this->generate_game_server_clients_json();
+      ret = make_shared<JSON>(this->generate_game_server_clients_json());
     } else if (uri == "/y/proxy-clients") {
-      ret = this->generate_proxy_server_clients_json();
+      ret = make_shared<JSON>(this->generate_proxy_server_clients_json());
     } else if (uri == "/y/lobbies") {
-      ret = this->generate_lobbies_json();
+      ret = make_shared<JSON>(this->generate_lobbies_json());
     } else if (uri == "/y/server") {
-      ret = this->generate_server_info_json();
+      ret = make_shared<JSON>(this->generate_server_info_json());
     } else if (uri == "/y/summary") {
-      ret = this->generate_summary_json();
+      ret = make_shared<JSON>(this->generate_summary_json());
     } else if (uri == "/y/all") {
-      ret = this->generate_all_json();
+      ret = make_shared<JSON>(this->generate_all_json());
 
     } else {
       throw http_error(404, "unknown action");
@@ -922,10 +956,14 @@ void HTTPServer::handle_request(struct evhttp_request* req) {
   }
 
   unique_ptr<struct evbuffer, void (*)(struct evbuffer*)> out_buffer(evbuffer_new(), evbuffer_free);
-  string* serialized = new string(ret.serialize(JSON::SerializeOption::ESCAPE_CONTROLS_ONLY | serialize_options));
+  string* serialized = new string(ret->serialize(JSON::SerializeOption::ESCAPE_CONTROLS_ONLY | serialize_options));
   auto cleanup = +[](const void*, size_t, void* s) -> void {
     delete reinterpret_cast<string*>(s);
   };
   evbuffer_add_reference(out_buffer.get(), serialized->data(), serialized->size(), cleanup, serialized);
   this->send_response(req, 200, "application/json", out_buffer.get());
 }
+
+void HTTPServer::thread_fn() {
+  event_base_loop(this->base.get(), EVLOOP_NO_EXIT_ON_EMPTY);
+}
diff --git a/src/HTTPServer.hh b/src/HTTPServer.hh
index 72de625a..69845f74 100644
--- a/src/HTTPServer.hh
+++ b/src/HTTPServer.hh
@@ -25,6 +25,9 @@ public:
   void listen(int port);
   void add_socket(int fd);
 
+  void schedule_stop();
+  void wait_for_stop();
+
 protected:
   class http_error : public std::runtime_error {
   public:
@@ -33,7 +36,11 @@ protected:
   };
 
   std::shared_ptr<ServerState> state;
+  std::shared_ptr<struct event_base> base;
   std::shared_ptr<struct evhttp> http;
+  std::thread th;
+
+  void thread_fn();
 
   static void dispatch_handle_request(struct evhttp_request* req, void* ctx);
   void handle_request(struct evhttp_request* req);
@@ -49,12 +56,12 @@ protected:
       const std::string& key,
       const std::string* _default = nullptr);
 
-  JSON generate_quest_json(std::shared_ptr<const Quest> q) const;
-  JSON generate_client_config_json(const Client::Config& config) const;
-  JSON generate_license_json(std::shared_ptr<const License> l) const;
-  JSON generate_game_client_json(std::shared_ptr<const Client> c) const;
-  JSON generate_proxy_client_json(std::shared_ptr<const ProxyServer::LinkedSession> ses) const;
-  JSON generate_lobby_json(std::shared_ptr<const Lobby> l) const;
+  static JSON generate_quest_json_st(std::shared_ptr<const Quest> q);
+  static JSON generate_client_config_json_st(const Client::Config& config);
+  static JSON generate_license_json_st(std::shared_ptr<const License> l);
+  static JSON generate_game_client_json_st(std::shared_ptr<const Client> c, std::shared_ptr<const ItemNameIndex> item_name_index);
+  static JSON generate_proxy_client_json_st(std::shared_ptr<const ProxyServer::LinkedSession> ses);
+  static JSON generate_lobby_json_st(std::shared_ptr<const Lobby> l, std::shared_ptr<const ItemNameIndex> item_name_index);
   JSON generate_game_server_clients_json() const;
   JSON generate_proxy_server_clients_json() const;
   JSON generate_server_info_json() const;
diff --git a/src/Main.cc b/src/Main.cc
index 8c928d48..22c9650e 100644
--- a/src/Main.cc
+++ b/src/Main.cc
@@ -2518,6 +2518,9 @@ Action a_run_server_replay_log(
       if (state->bb_patch_server) {
         state->bb_patch_server->schedule_stop();
       }
+      if (http_server) {
+        http_server->schedule_stop();
+      }
       if (state->pc_patch_server) {
         config_log.info("Waiting for PC_V2 patch server to stop");
         state->pc_patch_server->wait_for_stop();
@@ -2526,6 +2529,10 @@ Action a_run_server_replay_log(
         config_log.info("Waiting for BB_V4 patch server to stop");
         state->bb_patch_server->wait_for_stop();
       }
+      if (http_server) {
+        config_log.info("Waiting for HTTP server to stop");
+        http_server->wait_for_stop();
+      }
       state->proxy_server.reset(); // Break reference cycle
     });
 
diff --git a/src/ServerState.cc b/src/ServerState.cc
index 3e4d2529..98e5b016 100644
--- a/src/ServerState.cc
+++ b/src/ServerState.cc
@@ -393,8 +393,12 @@ shared_ptr<const ItemData::StackLimits> ServerState::item_stack_limits(Version v
   return ret;
 }
 
+shared_ptr<const ItemNameIndex> ServerState::item_name_index_opt(Version version) const {
+  return this->item_name_indexes.at(static_cast<size_t>(version));
+}
+
 shared_ptr<const ItemNameIndex> ServerState::item_name_index(Version version) const {
-  auto ret = this->item_name_indexes.at(static_cast<size_t>(version));
+  auto ret = this->item_name_index_opt(version);
   if (ret == nullptr) {
     throw runtime_error("no item name index exists for this version");
   }
@@ -559,11 +563,11 @@ void ServerState::load_config_early() {
   }
 
   config_log.info("Loading configuration");
-  this->config_json = JSON::parse(load_file(this->config_filename));
+  this->config_json = make_shared<JSON>(JSON::parse(load_file(this->config_filename)));
 
   auto parse_behavior_switch = [&](const string& json_key, BehaviorSwitch default_value) -> ServerState::BehaviorSwitch {
     try {
-      string behavior = this->config_json.get_string(json_key);
+      string behavior = this->config_json->get_string(json_key);
       if (behavior == "Off") {
         return ServerState::BehaviorSwitch::OFF;
       } else if (behavior == "OffByDefault") {
@@ -580,11 +584,11 @@ void ServerState::load_config_early() {
     }
   };
 
-  this->name = this->config_json.at("ServerName").as_string();
+  this->name = this->config_json->at("ServerName").as_string();
 
   if (!this->one_time_config_loaded) {
     try {
-      this->username = this->config_json.at("User").as_string();
+      this->username = this->config_json->at("User").as_string();
       if (this->username == "$SUDO_USER") {
         const char* user_from_env = getenv("SUDO_USER");
         if (!user_from_env) {
@@ -595,15 +599,15 @@ void ServerState::load_config_early() {
     } catch (const out_of_range&) {
     }
 
-    this->set_port_configuration(parse_port_configuration(this->config_json.at("PortConfiguration")));
+    this->set_port_configuration(parse_port_configuration(this->config_json->at("PortConfiguration")));
     try {
-      auto spec = this->parse_port_spec(this->config_json.at("DNSServerPort"));
+      auto spec = this->parse_port_spec(this->config_json->at("DNSServerPort"));
       this->dns_server_addr = std::move(spec.first);
       this->dns_server_port = spec.second;
     } catch (const out_of_range&) {
     }
     try {
-      for (const auto& item : this->config_json.at("IPStackListen").as_list()) {
+      for (const auto& item : this->config_json->at("IPStackListen").as_list()) {
         if (item->is_int()) {
           this->ip_stack_addresses.emplace_back(string_printf("0.0.0.0:%" PRId64, item->as_int()));
         } else {
@@ -613,7 +617,7 @@ void ServerState::load_config_early() {
     } catch (const out_of_range&) {
     }
     try {
-      for (const auto& item : this->config_json.at("PPPStackListen").as_list()) {
+      for (const auto& item : this->config_json->at("PPPStackListen").as_list()) {
         if (item->is_int()) {
           this->ppp_stack_addresses.emplace_back(string_printf("0.0.0.0:%" PRId64, item->as_int()));
         } else {
@@ -623,7 +627,7 @@ void ServerState::load_config_early() {
     } catch (const out_of_range&) {
     }
     try {
-      for (const auto& item : this->config_json.at("PPPRawListen").as_list()) {
+      for (const auto& item : this->config_json->at("PPPRawListen").as_list()) {
         if (item->is_int()) {
           this->ppp_raw_addresses.emplace_back(string_printf("0.0.0.0:%" PRId64, item->as_int()));
         } else {
@@ -633,7 +637,7 @@ void ServerState::load_config_early() {
     } catch (const out_of_range&) {
     }
     try {
-      for (const auto& item : this->config_json.at("HTTPListen").as_list()) {
+      for (const auto& item : this->config_json->at("HTTPListen").as_list()) {
         if (item->is_int()) {
           this->http_addresses.emplace_back(string_printf("0.0.0.0:%" PRId64, item->as_int()));
         } else {
@@ -646,7 +650,7 @@ void ServerState::load_config_early() {
     this->one_time_config_loaded = true;
   }
 
-  auto local_address_str = this->config_json.at("LocalAddress").as_string();
+  auto local_address_str = this->config_json->at("LocalAddress").as_string();
   try {
     this->local_address = this->all_addresses.at(local_address_str);
     string addr_str = string_for_address(this->local_address);
@@ -659,7 +663,7 @@ void ServerState::load_config_early() {
   this->all_addresses.erase("<local>");
   this->all_addresses.emplace("<local>", this->local_address);
 
-  auto external_address_str = this->config_json.at("ExternalAddress").as_string();
+  auto external_address_str = this->config_json->at("ExternalAddress").as_string();
   try {
     this->external_address = this->all_addresses.at(external_address_str);
     string addr_str = string_for_address(this->external_address);
@@ -672,32 +676,32 @@ void ServerState::load_config_early() {
   this->all_addresses.erase("<external>");
   this->all_addresses.emplace("<external>", this->external_address);
 
-  this->client_ping_interval_usecs = this->config_json.get_int("ClientPingInterval", 30000000);
-  this->client_idle_timeout_usecs = this->config_json.get_int("ClientIdleTimeout", 60000000);
-  this->patch_client_idle_timeout_usecs = this->config_json.get_int("PatchClientIdleTimeout", 300000000);
+  this->client_ping_interval_usecs = this->config_json->get_int("ClientPingInterval", 30000000);
+  this->client_idle_timeout_usecs = this->config_json->get_int("ClientIdleTimeout", 60000000);
+  this->patch_client_idle_timeout_usecs = this->config_json->get_int("PatchClientIdleTimeout", 300000000);
 
-  this->ip_stack_debug = this->config_json.get_bool("IPStackDebug", false);
-  this->allow_unregistered_users = this->config_json.get_bool("AllowUnregisteredUsers", false);
-  this->allow_pc_nte = this->config_json.get_bool("AllowPCNTE", false);
-  this->use_temp_licenses_for_prototypes = this->config_json.get_bool("UseTemporaryLicensesForPrototypes", true);
-  this->allowed_drop_modes_v1_v2_normal = this->config_json.get_int("AllowedDropModesV1V2Normal", 0x1F);
-  this->allowed_drop_modes_v1_v2_battle = this->config_json.get_int("AllowedDropModesV1V2Battle", 0x07);
-  this->allowed_drop_modes_v1_v2_challenge = this->config_json.get_int("AllowedDropModesV1V2Challenge", 0x07);
-  this->allowed_drop_modes_v3_normal = this->config_json.get_int("AllowedDropModesV3Normal", 0x1F);
-  this->allowed_drop_modes_v3_battle = this->config_json.get_int("AllowedDropModesV3Battle", 0x07);
-  this->allowed_drop_modes_v3_challenge = this->config_json.get_int("AllowedDropModesV3Challenge", 0x07);
-  this->allowed_drop_modes_v4_normal = this->config_json.get_int("AllowedDropModesV4Normal", 0x1D);
-  this->allowed_drop_modes_v4_battle = this->config_json.get_int("AllowedDropModesV4Battle", 0x05);
-  this->allowed_drop_modes_v4_challenge = this->config_json.get_int("AllowedDropModesV4Challenge", 0x05);
-  this->default_drop_mode_v1_v2_normal = this->config_json.get_enum("DefaultDropModeV1V2Normal", Lobby::DropMode::CLIENT);
-  this->default_drop_mode_v1_v2_battle = this->config_json.get_enum("DefaultDropModeV1V2Battle", Lobby::DropMode::CLIENT);
-  this->default_drop_mode_v1_v2_challenge = this->config_json.get_enum("DefaultDropModeV1V2Challenge", Lobby::DropMode::CLIENT);
-  this->default_drop_mode_v3_normal = this->config_json.get_enum("DefaultDropModeV3Normal", Lobby::DropMode::CLIENT);
-  this->default_drop_mode_v3_battle = this->config_json.get_enum("DefaultDropModeV3Battle", Lobby::DropMode::CLIENT);
-  this->default_drop_mode_v3_challenge = this->config_json.get_enum("DefaultDropModeV3Challenge", Lobby::DropMode::CLIENT);
-  this->default_drop_mode_v4_normal = this->config_json.get_enum("DefaultDropModeV4Normal", Lobby::DropMode::SERVER_SHARED);
-  this->default_drop_mode_v4_battle = this->config_json.get_enum("DefaultDropModeV4Battle", Lobby::DropMode::SERVER_SHARED);
-  this->default_drop_mode_v4_challenge = this->config_json.get_enum("DefaultDropModeV4Challenge", Lobby::DropMode::SERVER_SHARED);
+  this->ip_stack_debug = this->config_json->get_bool("IPStackDebug", false);
+  this->allow_unregistered_users = this->config_json->get_bool("AllowUnregisteredUsers", false);
+  this->allow_pc_nte = this->config_json->get_bool("AllowPCNTE", false);
+  this->use_temp_licenses_for_prototypes = this->config_json->get_bool("UseTemporaryLicensesForPrototypes", true);
+  this->allowed_drop_modes_v1_v2_normal = this->config_json->get_int("AllowedDropModesV1V2Normal", 0x1F);
+  this->allowed_drop_modes_v1_v2_battle = this->config_json->get_int("AllowedDropModesV1V2Battle", 0x07);
+  this->allowed_drop_modes_v1_v2_challenge = this->config_json->get_int("AllowedDropModesV1V2Challenge", 0x07);
+  this->allowed_drop_modes_v3_normal = this->config_json->get_int("AllowedDropModesV3Normal", 0x1F);
+  this->allowed_drop_modes_v3_battle = this->config_json->get_int("AllowedDropModesV3Battle", 0x07);
+  this->allowed_drop_modes_v3_challenge = this->config_json->get_int("AllowedDropModesV3Challenge", 0x07);
+  this->allowed_drop_modes_v4_normal = this->config_json->get_int("AllowedDropModesV4Normal", 0x1D);
+  this->allowed_drop_modes_v4_battle = this->config_json->get_int("AllowedDropModesV4Battle", 0x05);
+  this->allowed_drop_modes_v4_challenge = this->config_json->get_int("AllowedDropModesV4Challenge", 0x05);
+  this->default_drop_mode_v1_v2_normal = this->config_json->get_enum("DefaultDropModeV1V2Normal", Lobby::DropMode::CLIENT);
+  this->default_drop_mode_v1_v2_battle = this->config_json->get_enum("DefaultDropModeV1V2Battle", Lobby::DropMode::CLIENT);
+  this->default_drop_mode_v1_v2_challenge = this->config_json->get_enum("DefaultDropModeV1V2Challenge", Lobby::DropMode::CLIENT);
+  this->default_drop_mode_v3_normal = this->config_json->get_enum("DefaultDropModeV3Normal", Lobby::DropMode::CLIENT);
+  this->default_drop_mode_v3_battle = this->config_json->get_enum("DefaultDropModeV3Battle", Lobby::DropMode::CLIENT);
+  this->default_drop_mode_v3_challenge = this->config_json->get_enum("DefaultDropModeV3Challenge", Lobby::DropMode::CLIENT);
+  this->default_drop_mode_v4_normal = this->config_json->get_enum("DefaultDropModeV4Normal", Lobby::DropMode::SERVER_SHARED);
+  this->default_drop_mode_v4_battle = this->config_json->get_enum("DefaultDropModeV4Battle", Lobby::DropMode::SERVER_SHARED);
+  this->default_drop_mode_v4_challenge = this->config_json->get_enum("DefaultDropModeV4Challenge", Lobby::DropMode::SERVER_SHARED);
   if ((this->default_drop_mode_v4_normal == Lobby::DropMode::CLIENT) ||
       (this->default_drop_mode_v4_battle == Lobby::DropMode::CLIENT) ||
       (this->default_drop_mode_v4_challenge == Lobby::DropMode::CLIENT)) {
@@ -710,20 +714,20 @@ void ServerState::load_config_early() {
 
   this->quest_flag_persist_mask.update_all(true);
   try {
-    for (const auto& flag_id_json : this->config_json.get_list("PreventPersistQuestFlags")) {
+    for (const auto& flag_id_json : this->config_json->get_list("PreventPersistQuestFlags")) {
       this->quest_flag_persist_mask.clear(flag_id_json->as_int());
     }
   } catch (const out_of_range&) {
   }
 
-  this->persistent_game_idle_timeout_usecs = this->config_json.get_int("PersistentGameIdleTimeout", 0);
+  this->persistent_game_idle_timeout_usecs = this->config_json->get_int("PersistentGameIdleTimeout", 0);
   this->cheat_mode_behavior = parse_behavior_switch("CheatModeBehavior", BehaviorSwitch::OFF_BY_DEFAULT);
-  this->default_rare_notifs_enabled_v1_v2 = this->config_json.get_bool("RareNotificationsEnabledByDefault", false);
+  this->default_rare_notifs_enabled_v1_v2 = this->config_json->get_bool("RareNotificationsEnabledByDefault", false);
   this->default_rare_notifs_enabled_v3_v4 = this->default_rare_notifs_enabled_v1_v2;
-  this->default_rare_notifs_enabled_v1_v2 = this->config_json.get_bool("RareNotificationsEnabledByDefaultV1V2", this->default_rare_notifs_enabled_v1_v2);
-  this->default_rare_notifs_enabled_v3_v4 = this->config_json.get_bool("RareNotificationsEnabledByDefaultV3V4", this->default_rare_notifs_enabled_v3_v4);
-  this->ep3_send_function_call_enabled = this->config_json.get_bool("EnableEpisode3SendFunctionCall", false);
-  this->catch_handler_exceptions = this->config_json.get_bool("CatchHandlerExceptions", true);
+  this->default_rare_notifs_enabled_v1_v2 = this->config_json->get_bool("RareNotificationsEnabledByDefaultV1V2", this->default_rare_notifs_enabled_v1_v2);
+  this->default_rare_notifs_enabled_v3_v4 = this->config_json->get_bool("RareNotificationsEnabledByDefaultV3V4", this->default_rare_notifs_enabled_v3_v4);
+  this->ep3_send_function_call_enabled = this->config_json->get_bool("EnableEpisode3SendFunctionCall", false);
+  this->catch_handler_exceptions = this->config_json->get_bool("CatchHandlerExceptions", true);
 
   auto parse_int_list = +[](const JSON& json) -> vector<uint32_t> {
     vector<uint32_t> ret;
@@ -733,27 +737,27 @@ void ServerState::load_config_early() {
     return ret;
   };
 
-  this->ep3_infinite_meseta = this->config_json.get_bool("Episode3InfiniteMeseta", false);
+  this->ep3_infinite_meseta = this->config_json->get_bool("Episode3InfiniteMeseta", false);
   try {
-    this->ep3_defeat_player_meseta_rewards = parse_int_list(this->config_json.at("Episode3DefeatPlayerMeseta"));
+    this->ep3_defeat_player_meseta_rewards = parse_int_list(this->config_json->at("Episode3DefeatPlayerMeseta"));
   } catch (const out_of_range&) {
     this->ep3_defeat_player_meseta_rewards = {300, 400, 500, 600, 700};
   }
   try {
-    this->ep3_defeat_com_meseta_rewards = parse_int_list(this->config_json.get("Episode3DefeatCOMMeseta", JSON::list()));
+    this->ep3_defeat_com_meseta_rewards = parse_int_list(this->config_json->get("Episode3DefeatCOMMeseta", JSON::list()));
   } catch (const out_of_range&) {
     this->ep3_defeat_com_meseta_rewards = {100, 200, 300, 400, 500};
   }
-  this->ep3_final_round_meseta_bonus = this->config_json.get_int("Episode3FinalRoundMesetaBonus", 300);
-  this->ep3_jukebox_is_free = this->config_json.get_bool("Episode3JukeboxIsFree", false);
-  this->ep3_behavior_flags = this->config_json.get_int("Episode3BehaviorFlags", false);
-  this->ep3_card_auction_points = this->config_json.get_int("CardAuctionPoints", 0);
-  this->hide_download_commands = this->config_json.get_bool("HideDownloadCommands", true);
-  this->proxy_allow_save_files = this->config_json.get_bool("ProxyAllowSaveFiles", true);
-  this->proxy_enable_login_options = this->config_json.get_bool("ProxyEnableLoginOptions", false);
+  this->ep3_final_round_meseta_bonus = this->config_json->get_int("Episode3FinalRoundMesetaBonus", 300);
+  this->ep3_jukebox_is_free = this->config_json->get_bool("Episode3JukeboxIsFree", false);
+  this->ep3_behavior_flags = this->config_json->get_int("Episode3BehaviorFlags", false);
+  this->ep3_card_auction_points = this->config_json->get_int("CardAuctionPoints", 0);
+  this->hide_download_commands = this->config_json->get_bool("HideDownloadCommands", true);
+  this->proxy_allow_save_files = this->config_json->get_bool("ProxyAllowSaveFiles", true);
+  this->proxy_enable_login_options = this->config_json->get_bool("ProxyEnableLoginOptions", false);
 
   try {
-    const auto& i = this->config_json.at("CardAuctionSize");
+    const auto& i = this->config_json->at("CardAuctionSize");
     if (i.is_int()) {
       this->ep3_card_auction_min_size = i.as_int();
       this->ep3_card_auction_max_size = this->ep3_card_auction_min_size;
@@ -768,7 +772,7 @@ void ServerState::load_config_early() {
 
   if (!this->is_replay) {
     this->ep3_lobby_banners.clear();
-    for (const auto& it : this->config_json.get("Episode3LobbyBanners", JSON::list()).as_list()) {
+    for (const auto& it : this->config_json->get("Episode3LobbyBanners", JSON::list()).as_list()) {
       string path = "system/ep3/banners/" + it->at(2).as_string();
 
       string compressed_gvm_data;
@@ -820,7 +824,7 @@ void ServerState::load_config_early() {
       }
       return ret;
     };
-    const auto& categories_json = this->config_json.at("Episode3EXResultValues");
+    const auto& categories_json = this->config_json->at("Episode3EXResultValues");
     this->ep3_default_ex_values = parse_ep3_ex_result_cmd(categories_json.at("Default"));
     try {
       this->ep3_tournament_ex_values = parse_ep3_ex_result_cmd(categories_json.at("Tournament"));
@@ -835,7 +839,7 @@ void ServerState::load_config_early() {
   }
 
   try {
-    const auto& stack_limits_tables_json = this->config_json.at("ItemStackLimits");
+    const auto& stack_limits_tables_json = this->config_json->at("ItemStackLimits");
     for (size_t v_s = NUM_PATCH_VERSIONS; v_s < NUM_VERSIONS; v_s++) {
       try {
         Version v = static_cast<Version>(v_s);
@@ -863,25 +867,25 @@ void ServerState::load_config_early() {
     }
   }
 
-  this->bb_global_exp_multiplier = this->config_json.get_int("BBGlobalEXPMultiplier", 1);
+  this->bb_global_exp_multiplier = this->config_json->get_int("BBGlobalEXPMultiplier", 1);
 
-  set_log_levels_from_json(this->config_json.get("LogLevels", JSON::dict()));
+  set_log_levels_from_json(this->config_json->get("LogLevels", JSON::dict()));
 
   try {
-    this->run_shell_behavior = this->config_json.at("RunInteractiveShell").as_bool()
+    this->run_shell_behavior = this->config_json->at("RunInteractiveShell").as_bool()
         ? ServerState::RunShellBehavior::ALWAYS
         : ServerState::RunShellBehavior::NEVER;
   } catch (const out_of_range&) {
   }
 
-  this->allow_dc_pc_games = this->config_json.get_bool("AllowDCPCGames", true);
-  this->allow_gc_xb_games = this->config_json.get_bool("AllowGCXBGames", true);
+  this->allow_dc_pc_games = this->config_json->get_bool("AllowDCPCGames", true);
+  this->allow_gc_xb_games = this->config_json->get_bool("AllowGCXBGames", true);
 
   for (auto& order : this->public_lobby_search_orders) {
     order.clear();
   }
   try {
-    const auto& orders_json = this->config_json.get_list("LobbySearchOrders");
+    const auto& orders_json = this->config_json->get_list("LobbySearchOrders");
     for (size_t v_s = 0; v_s < orders_json.size(); v_s++) {
       auto& order = this->public_lobby_search_orders.at(v_s);
       const auto& order_json = orders_json.at(v_s);
@@ -899,7 +903,7 @@ void ServerState::load_config_early() {
     }
   }
   try {
-    const auto& events_json = this->config_json.get_list("LobbyEvents");
+    const auto& events_json = this->config_json->get_list("LobbyEvents");
     for (size_t z = 0; z < events_json.size(); z++) {
       const auto& v = events_json.at(z);
       uint8_t event = v->is_int() ? v->as_int() : event_for_name(v->as_string());
@@ -914,15 +918,15 @@ void ServerState::load_config_early() {
 
   this->pre_lobby_event = 0;
   try {
-    auto v = this->config_json.at("MenuEvent");
+    auto v = this->config_json->at("MenuEvent");
     this->pre_lobby_event = v.is_int() ? v.as_int() : event_for_name(v.as_string());
   } catch (const out_of_range&) {
   }
 
-  this->ep3_menu_song = this->config_json.get_int("Episode3MenuSong", -1);
+  this->ep3_menu_song = this->config_json->get_int("Episode3MenuSong", -1);
 
   try {
-    this->quest_category_index = make_shared<QuestCategoryIndex>(this->config_json.at("QuestCategories"));
+    this->quest_category_index = make_shared<QuestCategoryIndex>(this->config_json->at("QuestCategories"));
   } catch (const exception& e) {
     throw runtime_error(string_printf(
         "QuestCategories is missing or invalid in config.json (%s) - see config.example.json for an example", e.what()));
@@ -941,9 +945,9 @@ void ServerState::load_config_early() {
       "Return to the\nmain menu", MenuItem::Flag::INVISIBLE_IN_INFO_MENU);
   {
     auto blank_json = JSON::list();
-    const JSON& default_json = this->config_json.get("InformationMenuContents", blank_json);
-    const JSON& v2_json = this->config_json.get("InformationMenuContentsV1V2", default_json);
-    const JSON& v3_json = this->config_json.get("InformationMenuContentsV3", default_json);
+    const JSON& default_json = this->config_json->get("InformationMenuContents", blank_json);
+    const JSON& v2_json = this->config_json->get("InformationMenuContentsV1V2", default_json);
+    const JSON& v3_json = this->config_json->get("InformationMenuContentsV3", default_json);
 
     uint32_t item_id = 0;
     for (const auto& item : v2_json.as_list()) {
@@ -974,7 +978,7 @@ void ServerState::load_config_early() {
 
     try {
       map<string, const JSON&> sorted_jsons;
-      for (const auto& it : this->config_json.at(key).as_dict()) {
+      for (const auto& it : this->config_json->at(key).as_dict()) {
         sorted_jsons.emplace(it.first, *it.second);
       }
 
@@ -1000,7 +1004,7 @@ void ServerState::load_config_early() {
   this->proxy_destinations_menu_xb = generate_proxy_destinations_menu(this->proxy_destinations_xb, "ProxyDestinations-XB");
 
   try {
-    const string& netloc_str = this->config_json.get_string("ProxyDestination-Patch");
+    const string& netloc_str = this->config_json->get_string("ProxyDestination-Patch");
     this->proxy_destination_patch = parse_netloc(netloc_str);
     config_log.info("Patch server proxy is enabled with destination %s", netloc_str.c_str());
     for (auto& it : this->name_to_port_config) {
@@ -1013,7 +1017,7 @@ void ServerState::load_config_early() {
     this->proxy_destination_patch.second = 0;
   }
   try {
-    const string& netloc_str = this->config_json.get_string("ProxyDestination-BB");
+    const string& netloc_str = this->config_json->get_string("ProxyDestination-BB");
     this->proxy_destination_bb = parse_netloc(netloc_str);
     config_log.info("BB proxy is enabled with destination %s", netloc_str.c_str());
     for (auto& it : this->name_to_port_config) {
@@ -1026,13 +1030,13 @@ void ServerState::load_config_early() {
     this->proxy_destination_bb.second = 0;
   }
 
-  this->welcome_message = this->config_json.get_string("WelcomeMessage", "");
-  this->pc_patch_server_message = this->config_json.get_string("PCPatchServerMessage", "");
-  this->bb_patch_server_message = this->config_json.get_string("BBPatchServerMessage", "");
+  this->welcome_message = this->config_json->get_string("WelcomeMessage", "");
+  this->pc_patch_server_message = this->config_json->get_string("PCPatchServerMessage", "");
+  this->bb_patch_server_message = this->config_json->get_string("BBPatchServerMessage", "");
 
   this->team_reward_defs_json = nullptr;
   try {
-    this->team_reward_defs_json = std::move(this->config_json.at("TeamRewards"));
+    this->team_reward_defs_json = std::move(this->config_json->at("TeamRewards"));
   } catch (const out_of_range&) {
   }
 
@@ -1041,14 +1045,14 @@ void ServerState::load_config_early() {
     try {
       string key = "RareEnemyRates-";
       key += token_name_for_difficulty(z);
-      this->rare_enemy_rates_by_difficulty[z] = make_shared<Map::RareEnemyRates>(this->config_json.at(key));
+      this->rare_enemy_rates_by_difficulty[z] = make_shared<Map::RareEnemyRates>(this->config_json->at(key));
       prev = this->rare_enemy_rates_by_difficulty[z];
     } catch (const out_of_range&) {
       this->rare_enemy_rates_by_difficulty[z] = prev;
     }
   }
   try {
-    this->rare_enemy_rates_challenge = make_shared<Map::RareEnemyRates>(this->config_json.at("RareEnemyRates-Challenge"));
+    this->rare_enemy_rates_challenge = make_shared<Map::RareEnemyRates>(this->config_json->at("RareEnemyRates-Challenge"));
   } catch (const out_of_range&) {
     this->rare_enemy_rates_challenge = Map::DEFAULT_RARE_ENEMIES;
   }
@@ -1057,7 +1061,7 @@ void ServerState::load_config_early() {
   this->min_levels_v4[1] = DEFAULT_MIN_LEVELS_V4_EP2;
   this->min_levels_v4[2] = DEFAULT_MIN_LEVELS_V4_EP4;
   try {
-    for (const auto& ep_it : this->config_json.get_dict("BBMinimumLevels")) {
+    for (const auto& ep_it : this->config_json->get_dict("BBMinimumLevels")) {
       array<size_t, 4> levels({0, 0, 0, 0});
       for (size_t z = 0; z < 4; z++) {
         levels[z] = ep_it.second->get_int(z) - 1;
@@ -1083,7 +1087,7 @@ void ServerState::load_config_early() {
 void ServerState::load_config_late() {
   this->ep3_card_auction_pool.clear();
   try {
-    for (const auto& it : this->config_json.get_dict("CardAuctionPool")) {
+    for (const auto& it : this->config_json->get_dict("CardAuctionPool")) {
       uint16_t card_id;
       try {
         card_id = this->ep3_card_index->definition_for_name_normalized(it.first)->def.card_id;
@@ -1104,7 +1108,7 @@ void ServerState::load_config_late() {
   }
   if (this->ep3_card_index) {
     try {
-      const auto& ep3_trap_cards_json = this->config_json.get_list("Episode3TrapCards");
+      const auto& ep3_trap_cards_json = this->config_json->get_list("Episode3TrapCards");
       if (!ep3_trap_cards_json.empty()) {
         if (ep3_trap_cards_json.size() != 5) {
           throw runtime_error("Episode3TrapCards must be a list of 5 lists");
@@ -1137,7 +1141,7 @@ void ServerState::load_config_late() {
   this->secret_lottery_results.clear();
   if (this->item_name_index(Version::BB_V4)) {
     try {
-      for (const auto& type_it : this->config_json.get_list("QuestF95EResultItems")) {
+      for (const auto& type_it : this->config_json->get_list("QuestF95EResultItems")) {
         auto& type_res = this->quest_F95E_results.emplace_back();
         for (const auto& difficulty_it : type_it->as_list()) {
           auto& difficulty_res = type_res.emplace_back();
@@ -1149,7 +1153,7 @@ void ServerState::load_config_late() {
     } catch (const out_of_range&) {
     }
     try {
-      for (const auto& it : this->config_json.get_list("QuestF95FResultItems")) {
+      for (const auto& it : this->config_json->get_list("QuestF95FResultItems")) {
         auto& list = it->as_list();
         size_t price = list.at(0)->as_int();
         this->quest_F95F_results.emplace_back(make_pair(price, this->parse_item_description(Version::BB_V4, list.at(1)->as_string())));
@@ -1157,14 +1161,14 @@ void ServerState::load_config_late() {
     } catch (const out_of_range&) {
     }
     try {
-      this->quest_F960_failure_results = QuestF960Result(this->config_json.at("QuestF960FailureResultItems"), this->item_name_index(Version::BB_V4));
-      for (const auto& it : this->config_json.get_list("QuestF960SuccessResultItems")) {
+      this->quest_F960_failure_results = QuestF960Result(this->config_json->at("QuestF960FailureResultItems"), this->item_name_index(Version::BB_V4));
+      for (const auto& it : this->config_json->get_list("QuestF960SuccessResultItems")) {
         this->quest_F960_success_results.emplace_back(*it, this->item_name_index(Version::BB_V4));
       }
     } catch (const out_of_range&) {
     }
     try {
-      for (const auto& it : this->config_json.get_list("SecretLotteryResultItems")) {
+      for (const auto& it : this->config_json->get_list("SecretLotteryResultItems")) {
         this->secret_lottery_results.emplace_back(this->parse_item_description(Version::BB_V4, it->as_string()));
       }
     } catch (const out_of_range&) {
diff --git a/src/ServerState.hh b/src/ServerState.hh
index 4e75024c..5c75cacf 100644
--- a/src/ServerState.hh
+++ b/src/ServerState.hh
@@ -66,7 +66,7 @@ struct ServerState : public std::enable_shared_from_this<ServerState> {
   std::shared_ptr<struct event_base> base;
 
   std::string config_filename;
-  JSON config_json;
+  std::shared_ptr<const JSON> config_json;
   bool is_replay = false;
   bool one_time_config_loaded = false;
   bool default_lobbies_created = false;
@@ -285,7 +285,8 @@ struct ServerState : public std::enable_shared_from_this<ServerState> {
   std::shared_ptr<const ItemParameterTable> item_parameter_table(Version version) const;
   std::shared_ptr<const ItemParameterTable> item_parameter_table_for_encode(Version version) const;
   std::shared_ptr<const ItemData::StackLimits> item_stack_limits(Version version) const;
-  std::shared_ptr<const ItemNameIndex> item_name_index(Version version) const;
+  std::shared_ptr<const ItemNameIndex> item_name_index_opt(Version version) const; // Returns null if missing
+  std::shared_ptr<const ItemNameIndex> item_name_index(Version version) const; // Throws if missing
   std::string describe_item(Version version, const ItemData& item, bool include_color_codes) const;
   ItemData parse_item_description(Version version, const std::string& description) const;