diff --git a/drust/src/main.rs b/drust/src/main.rs
index 6916d3b1..ac96b1ed 100644
--- a/drust/src/main.rs
+++ b/drust/src/main.rs
@@ -1,4 +1,6 @@
+use pagetop::prelude::*;
+
 #[actix_web::main]
 async fn main() -> std::io::Result<()> {
-    pagetop::Application::build(None).await?.run()?.await
+    Application::prepare(essence).await?.run()?.await
 }
diff --git a/pagetop/Cargo.toml b/pagetop/Cargo.toml
index b828e58f..e6cbc75e 100644
--- a/pagetop/Cargo.toml
+++ b/pagetop/Cargo.toml
@@ -27,16 +27,16 @@ categories = [
 doc-comment = "0.3.3"
 downcast-rs = "1.2.0"
 figlet-rs   = "0.1.3"
-futures     = "0.3"
-once_cell   = "1.9.0"
+futures     = "0.3.21"
+once_cell   = "1.10.0"
 url         = "2.2.2"
 
 config_rs = { package = "config", version = "0.11.0", features = ["toml"] }
 
-tracing = "0.1"
-tracing-appender = "0.2"
-tracing-subscriber = { version = "0.3", features = ["json", "env-filter"] }
-tracing-unwrap = { version = "0.9", default-features = false }
+tracing = "0.1.32"
+tracing-appender = "0.2.1"
+tracing-subscriber = { version = "0.3.9", features = ["json", "env-filter"] }
+tracing-unwrap = { version = "0.9.2", default-features = false }
 tracing-actix-web = "0.2"
 
 fluent-templates = "0.6.1"
@@ -51,17 +51,20 @@ sycamore = { version = "0.7.1", features = ["ssr"] }
 serde = { version = "1.0", features = ["derive"] }
 
 [dependencies.sea-orm]
-version = "0.6"
+version = "0.6.0"
 features = ["debug-print", "macros", "runtime-async-std-native-tls"]
 default-features = false
 optional = true
 
 [dependencies.sea-schema]
-version = "0.5"
+version = "0.6.0"
 features = ["debug-print", "migration"]
 default-features = false
 optional = true
 
+[dev-dependencies]
+tokio = { version = "1.17.0", features = ["macros", "rt-multi-thread"] }
+
 [features]
 default  = []
 mysql    = ["sea-orm", "sea-schema", "sea-orm/sqlx-mysql"]
diff --git a/pagetop/src/base/module/admin/mod.rs b/pagetop/src/base/module/admin/mod.rs
index 0bb1202d..808aa75e 100644
--- a/pagetop/src/base/module/admin/mod.rs
+++ b/pagetop/src/base/module/admin/mod.rs
@@ -6,7 +6,7 @@ mod summary;
 
 pub struct AdminModule;
 
-impl Module for AdminModule {
+impl ModuleTrait for AdminModule {
     fn name(&self) -> &'static str {
         "admin"
     }
diff --git a/pagetop/src/base/module/homepage/mod.rs b/pagetop/src/base/module/homepage/mod.rs
index de4b98ce..b6aac4fe 100644
--- a/pagetop/src/base/module/homepage/mod.rs
+++ b/pagetop/src/base/module/homepage/mod.rs
@@ -4,7 +4,7 @@ localize!("en-US", "src/base/module/homepage/locales");
 
 pub struct HomepageModule;
 
-impl Module for HomepageModule {
+impl ModuleTrait for HomepageModule {
     fn name(&self) -> &'static str {
         "homepage"
     }
diff --git a/pagetop/src/base/module/user/mod.rs b/pagetop/src/base/module/user/mod.rs
index 7dc3c043..99096377 100644
--- a/pagetop/src/base/module/user/mod.rs
+++ b/pagetop/src/base/module/user/mod.rs
@@ -7,7 +7,7 @@ mod migration;
 
 pub struct UserModule;
 
-impl Module for UserModule {
+impl ModuleTrait for UserModule {
     fn name(&self) -> &'static str {
         "user"
     }
diff --git a/pagetop/src/base/theme/aliner/mod.rs b/pagetop/src/base/theme/aliner/mod.rs
index b678d4b7..18df448f 100644
--- a/pagetop/src/base/theme/aliner/mod.rs
+++ b/pagetop/src/base/theme/aliner/mod.rs
@@ -4,7 +4,7 @@ include!(concat!(env!("OUT_DIR"), "/aliner.rs"));
 
 pub struct AlinerTheme;
 
-impl Theme for AlinerTheme {
+impl ThemeTrait for AlinerTheme {
     fn name(&self) -> &'static str {
         "aliner"
     }
diff --git a/pagetop/src/base/theme/bootsier/mod.rs b/pagetop/src/base/theme/bootsier/mod.rs
index 3a340a84..dd16d71c 100644
--- a/pagetop/src/base/theme/bootsier/mod.rs
+++ b/pagetop/src/base/theme/bootsier/mod.rs
@@ -6,7 +6,7 @@ localize!("en-US", "src/base/theme/bootsier/locales");
 
 pub struct BootsierTheme;
 
-impl Theme for BootsierTheme {
+impl ThemeTrait for BootsierTheme {
     fn name(&self) -> &'static str {
         "bootsier"
     }
diff --git a/pagetop/src/base/theme/minimal/mod.rs b/pagetop/src/base/theme/minimal/mod.rs
index c6780005..b3a50906 100644
--- a/pagetop/src/base/theme/minimal/mod.rs
+++ b/pagetop/src/base/theme/minimal/mod.rs
@@ -2,7 +2,7 @@ use crate::prelude::*;
 
 pub struct MinimalTheme;
 
-impl Theme for MinimalTheme {
+impl ThemeTrait for MinimalTheme {
     fn name(&self) -> &'static str {
         "minimal"
     }
diff --git a/pagetop/src/core/global.rs b/pagetop/src/core/all.rs
similarity index 53%
rename from pagetop/src/core/global.rs
rename to pagetop/src/core/all.rs
index dd9aa909..b48e0684 100644
--- a/pagetop/src/core/global.rs
+++ b/pagetop/src/core/all.rs
@@ -1,21 +1,19 @@
 use crate::{Lazy, trace};
-use crate::core::theme::Theme;
-use crate::core::module::Module;
-use crate::core::response::page::PageContainer;
+use crate::core::theme::ThemeTrait;
+use crate::core::module::ModuleTrait;
 use crate::core::server;
 
 use std::sync::RwLock;
-use std::collections::HashMap;
 
 include!(concat!(env!("OUT_DIR"), "/theme.rs"));
 
 // -----------------------------------------------------------------------------
-// Temas registrados y tema por defecto.
+// Temas registrados y tema predeterminado.
 // -----------------------------------------------------------------------------
 
-pub static THEMES: Lazy<RwLock<Vec<&dyn Theme>>> = Lazy::new(|| {
-    RwLock::new(Vec::new())
-});
+pub static THEMES: Lazy<RwLock<Vec<&dyn ThemeTrait>>> = Lazy::new(
+    || { RwLock::new(Vec::new()) }
+);
 
 pub fn themes(cfg: &mut server::web::ServiceConfig) {
     cfg.service(actix_web_static_files::ResourceFiles::new(
@@ -32,9 +30,9 @@ pub fn themes(cfg: &mut server::web::ServiceConfig) {
 // Módulos registrados.
 // -----------------------------------------------------------------------------
 
-pub static MODULES: Lazy<RwLock<Vec<&dyn Module>>> = Lazy::new(|| {
-    RwLock::new(Vec::new())
-});
+pub static MODULES: Lazy<RwLock<Vec<&dyn ModuleTrait>>> = Lazy::new(
+    || { RwLock::new(Vec::new()) }
+);
 
 pub fn modules(cfg: &mut server::web::ServiceConfig) {
     for m in MODULES.read().unwrap().iter() {
@@ -43,19 +41,9 @@ pub fn modules(cfg: &mut server::web::ServiceConfig) {
 }
 
 #[cfg(any(feature = "mysql", feature = "postgres", feature = "sqlite"))]
-pub fn run_migrations() {
-    trace::info!("Checking migrations.");
+pub fn migrations() {
+    trace::info!("Checking migrations");
     for m in MODULES.read().unwrap().iter() {
-        m.migrations(
-            &*server::db::DBCONN.read().unwrap()
-        ).expect("Failed to run migrations");
+        m.migrations(&*server::db::DBCONN).expect("Failed to run migrations");
     }
 }
-
-// -----------------------------------------------------------------------------
-// Componentes globales.
-// -----------------------------------------------------------------------------
-
-pub static COMPONENTS: Lazy<RwLock<HashMap<&str, PageContainer>>> = Lazy::new(
-    || { RwLock::new(HashMap::new()) }
-);
diff --git a/pagetop/src/core/html.rs b/pagetop/src/core/html.rs
new file mode 100644
index 00000000..ba885bb3
--- /dev/null
+++ b/pagetop/src/core/html.rs
@@ -0,0 +1 @@
+pub use maud::{DOCTYPE, Markup, PreEscaped, html};
diff --git a/pagetop/src/core/mod.rs b/pagetop/src/core/mod.rs
index 26618959..8db86b83 100644
--- a/pagetop/src/core/mod.rs
+++ b/pagetop/src/core/mod.rs
@@ -1,7 +1,8 @@
 pub use actix_web::dev::Server;
 
-mod global;
+mod all;
 
+pub mod html;
 pub mod theme;
 pub mod module;
 pub mod response;
diff --git a/pagetop/src/core/module/definition.rs b/pagetop/src/core/module/definition.rs
index 7dc6252b..011ef083 100644
--- a/pagetop/src/core/module/definition.rs
+++ b/pagetop/src/core/module/definition.rs
@@ -4,7 +4,7 @@ use crate::core::server;
 use crate::db;
 
 /// Los módulos deben implementar este *trait*.
-pub trait Module: Send + Sync {
+pub trait ModuleTrait: Send + Sync {
     fn name(&self) -> &'static str;
 
     fn fullname(&self) -> String;
diff --git a/pagetop/src/core/module/mod.rs b/pagetop/src/core/module/mod.rs
index 439cff79..2a42352a 100644
--- a/pagetop/src/core/module/mod.rs
+++ b/pagetop/src/core/module/mod.rs
@@ -1,14 +1,14 @@
-use crate::core::global;
+use crate::core::all;
 
 mod definition;
-pub use definition::Module;
+pub use definition::ModuleTrait;
 
-pub fn register_module(m: &'static (dyn Module + 'static)) {
-    global::MODULES.write().unwrap().push(m);
+pub fn register_module(m: &'static (dyn ModuleTrait + 'static)) {
+    all::MODULES.write().unwrap().push(m);
 }
 
-pub fn find_module(name: &str) -> Option<&'static (dyn Module + 'static)> {
-    let modules = global::MODULES.write().unwrap();
+pub fn find_module(name: &str) -> Option<&'static (dyn ModuleTrait + 'static)> {
+    let modules = all::MODULES.write().unwrap();
     match modules.iter().find(|t| t.name() == name) {
         Some(module) => Some(*module),
         _ => None,
diff --git a/pagetop/src/core/response/page/assets.rs b/pagetop/src/core/response/page/assets.rs
index 11cdd35c..2bd96fc2 100644
--- a/pagetop/src/core/response/page/assets.rs
+++ b/pagetop/src/core/response/page/assets.rs
@@ -1,10 +1,11 @@
 use crate::{Lazy, base};
 use crate::config::SETTINGS;
-use crate::core::global;
-use crate::core::theme::{Markup, PreEscaped, Theme, find_theme, html};
+use crate::core::all;
+use crate::core::html::{Markup, PreEscaped, html};
+use crate::core::theme::*;
 
-static DEFAULT_THEME: Lazy<&dyn Theme> = Lazy::new(|| {
-    for t in global::THEMES.read().unwrap().iter() {
+static DEFAULT_THEME: Lazy<&dyn ThemeTrait> = Lazy::new(|| {
+    for t in all::THEMES.read().unwrap().iter() {
         if t.name().to_lowercase() == SETTINGS.app.theme.to_lowercase() {
             return *t;
         }
@@ -184,7 +185,7 @@ impl JavaScript {
 // -----------------------------------------------------------------------------
 
 pub struct PageAssets {
-    theme      : &'static dyn Theme,
+    theme      : &'static dyn ThemeTrait,
     favicon    : Option<Favicon>,
     metadata   : Vec<(String, String)>,
     stylesheets: Vec<StyleSheet>,
@@ -259,7 +260,7 @@ impl PageAssets {
 
     /// Assets GETTERS.
 
-    pub fn theme(&mut self) -> &'static dyn Theme {
+    pub fn theme(&mut self) -> &'static dyn ThemeTrait {
         self.theme
     }
 
diff --git a/pagetop/src/core/response/page/component.rs b/pagetop/src/core/response/page/component.rs
index 1472ffe2..78925468 100644
--- a/pagetop/src/core/response/page/component.rs
+++ b/pagetop/src/core/response/page/component.rs
@@ -1,4 +1,4 @@
-use crate::core::theme::{Markup, html};
+use crate::core::html::{Markup, html};
 use crate::core::response::page::PageAssets;
 
 use downcast_rs::{Downcast, impl_downcast};
diff --git a/pagetop/src/core/response/page/container.rs b/pagetop/src/core/response/page/container.rs
index 6bf5e56a..4a577b2d 100644
--- a/pagetop/src/core/response/page/container.rs
+++ b/pagetop/src/core/response/page/container.rs
@@ -1,4 +1,4 @@
-use crate::core::theme::{Markup, html};
+use crate::core::html::{Markup, html};
 use crate::core::response::page::{PageAssets, PageComponent, render_component};
 
 use std::sync::Arc;
diff --git a/pagetop/src/core/response/page/page.rs b/pagetop/src/core/response/page/page.rs
index 8052683d..d47a33f1 100644
--- a/pagetop/src/core/response/page/page.rs
+++ b/pagetop/src/core/response/page/page.rs
@@ -1,12 +1,17 @@
 use crate::{Lazy, trace, util};
 use crate::config::SETTINGS;
-use crate::core::{global, server};
-use crate::core::theme::{DOCTYPE, Markup, html};
+use crate::core::html::{DOCTYPE, Markup, html};
 use crate::core::response::page::{PageAssets, PageComponent, PageContainer};
+use crate::core::server;
 
 use std::borrow::Cow;
+use std::sync::RwLock;
 use std::collections::HashMap;
 
+static COMPONENTS: Lazy<RwLock<HashMap<&str, PageContainer>>> = Lazy::new(|| {
+    RwLock::new(HashMap::new())
+});
+
 static DEFAULT_LANGUAGE: Lazy<Option<String>> = Lazy::new(|| {
     let language = SETTINGS.app.language[..2].to_lowercase();
     if !language.is_empty() {
@@ -25,9 +30,9 @@ static DEFAULT_DIRECTION: Lazy<Option<String>> = Lazy::new(|| {
         "" => None,
         _ => {
             trace::warn!(
-                "Text direction \"{}\" not valid. {}.",
+                "Text direction \"{}\" not valid, {}",
                 SETTINGS.app.direction,
-                "Check the settings file"
+                "check the settings file"
             );
             None
         }
@@ -63,7 +68,7 @@ impl<'a> Page<'a> {
             description : None,
             body_classes: "body".into(),
             assets      : PageAssets::new(),
-            regions     : global::COMPONENTS.read().unwrap().clone(),
+            regions     : COMPONENTS.read().unwrap().clone(),
             template    : "default".to_owned(),
         }
     }
@@ -208,7 +213,7 @@ pub fn render_component(
 }
 
 pub fn add_component_to(region: &'static str, component: impl PageComponent) {
-    let mut hmap = global::COMPONENTS.write().unwrap();
+    let mut hmap = COMPONENTS.write().unwrap();
     if let Some(regions) = hmap.get_mut(region) {
         regions.add(component);
     } else {
diff --git a/pagetop/src/core/server/app.rs b/pagetop/src/core/server/app.rs
index 7338aa3b..cbca9979 100644
--- a/pagetop/src/core/server/app.rs
+++ b/pagetop/src/core/server/app.rs
@@ -1,6 +1,6 @@
 use crate::{Lazy, base, trace};
 use crate::config::SETTINGS;
-use crate::core::{Server, global, server};
+use crate::core::{Server, all, server};
 use crate::core::theme::register_theme;
 use crate::core::module::register_module;
 
@@ -11,8 +11,12 @@ pub struct Application {
     server: Server,
 }
 
+pub fn essence() {
+    trace::info!("No bootstrap configured");
+}
+
 impl Application {
-    pub async fn build(bootstrap: Option<fn()>) -> Result<Self, Error> {
+    pub async fn prepare(bootstrap: fn()) -> Result<Self, Error> {
         // Imprime un rótulo de presentación (opcional).
         if SETTINGS.app.startup_banner.to_lowercase() != "off" {
             let figfont = figlet_rs::FIGfont::from_content(
@@ -61,10 +65,8 @@ impl Application {
         register_module(&base::module::user::UserModule);
 
         // Ejecuta la función de inicio de la aplicación.
-        if bootstrap != None {
-            trace::info!("Calling application bootstrap.");
-            let _ = &(bootstrap.unwrap())();
-        }
+        trace::info!("Calling application bootstrap");
+        let _ = &bootstrap();
 
         // Registra el módulo para la página de inicio de PageTop.
         // Al ser el último, puede sobrecargarse con la función de inicio.
@@ -72,15 +74,15 @@ impl Application {
 
         // Comprueba actualizaciones pendientes de la base de datos (opcional).
         #[cfg(any(feature = "mysql", feature = "postgres", feature = "sqlite"))]
-        global::run_migrations();
+        all::migrations();
 
         // Prepara el servidor web.
         let server = server::HttpServer::new(move || {
             server::App::new()
                 .wrap(tracing_actix_web::TracingLogger)
                 .wrap(NormalizePath::new(TrailingSlash::Trim))
-                .configure(&global::themes)
-                .configure(&global::modules)
+                .configure(&all::themes)
+                .configure(&all::modules)
             })
             .bind(format!("{}:{}",
                 &SETTINGS.webserver.bind_address,
diff --git a/pagetop/src/core/server/db.rs b/pagetop/src/core/server/db.rs
index 8c5c9f1f..9d196970 100644
--- a/pagetop/src/core/server/db.rs
+++ b/pagetop/src/core/server/db.rs
@@ -1,13 +1,12 @@
 use crate::{Lazy, db, run_now, trace};
 use crate::config::SETTINGS;
 
-use std::sync::RwLock;
 use sea_orm::{ConnectOptions, Database};
 use tracing_unwrap::ResultExt;
 
-pub static DBCONN: Lazy<RwLock<db::DbConn>> = Lazy::new(|| {
+pub static DBCONN: Lazy<db::DbConn> = Lazy::new(|| {
     trace::info!(
-        "Connecting to database \"{}\" using a pool of {} connections.",
+        "Connecting to database \"{}\" using a pool of {} connections",
         &SETTINGS.database.db_name,
         &SETTINGS.database.max_pool_size
     );
@@ -41,20 +40,18 @@ pub static DBCONN: Lazy<RwLock<db::DbConn>> = Lazy::new(|| {
             ).as_str()).unwrap(),
         _ => {
             trace::error!(
-                "Unrecognized database type \"{}\".",
+                "Unrecognized database type \"{}\"",
                 &SETTINGS.database.db_type
             );
             db::DbUri::parse("").unwrap()
         }
     };
 
-    let db_conn = run_now(
+    run_now(
         Database::connect::<ConnectOptions>({
             let mut db_opt = ConnectOptions::new(db_uri.to_string());
             db_opt.max_connections(SETTINGS.database.max_pool_size);
             db_opt.into()
         })
-    ).expect_or_log("Failed to connect to database");
-
-    RwLock::new(db_conn)
+    ).expect_or_log("Failed to connect to database")
 });
diff --git a/pagetop/src/core/server/locale.rs b/pagetop/src/core/server/locale.rs
index 8bc6fc10..59fc8468 100644
--- a/pagetop/src/core/server/locale.rs
+++ b/pagetop/src/core/server/locale.rs
@@ -11,11 +11,12 @@ pub static LANGID: Lazy<LanguageIdentifier> = Lazy::new(|| {
         Ok(language) => language,
         Err(_) => {
             trace::warn!(
-                "Failed to parse language \"{}\". {}. {}. {}.",
+                "{}, {} \"{}\"! {}, {}",
+                "Failed to parse language",
+                "unrecognized Unicode Language Identifier",
                 SETTINGS.app.language,
-                "Unrecognized Unicode Language Identifier",
                 "Using \"en-US\"",
-                "Check the settings file",
+                "check the settings file",
             );
             "en-US".parse().unwrap()
         }
diff --git a/pagetop/src/core/theme/definition.rs b/pagetop/src/core/theme/definition.rs
index 12d9e05f..eb67ec10 100644
--- a/pagetop/src/core/theme/definition.rs
+++ b/pagetop/src/core/theme/definition.rs
@@ -1,11 +1,11 @@
 use crate::config::SETTINGS;
-use crate::core::server;
-use crate::core::theme::{Markup, html};
+use crate::core::html::{Markup, html};
 use crate::core::response::page::{Page, PageAssets, PageComponent};
+use crate::core::server;
 use crate::base::component::Chunck;
 
 /// Los temas deben implementar este "trait".
-pub trait Theme: Send + Sync {
+pub trait ThemeTrait: Send + Sync {
     fn name(&self) -> &'static str;
 
     fn fullname(&self) -> String;
diff --git a/pagetop/src/core/theme/mod.rs b/pagetop/src/core/theme/mod.rs
index 8292ade6..e83f4307 100644
--- a/pagetop/src/core/theme/mod.rs
+++ b/pagetop/src/core/theme/mod.rs
@@ -1,16 +1,14 @@
-use crate::core::global;
-
-pub use maud::{DOCTYPE, Markup, PreEscaped, html};
+use crate::core::all;
 
 mod definition;
-pub use definition::Theme;
+pub use definition::ThemeTrait;
 
-pub fn register_theme(t: &'static (dyn Theme + 'static)) {
-    global::THEMES.write().unwrap().push(t);
+pub fn register_theme(t: &'static (dyn ThemeTrait + 'static)) {
+    all::THEMES.write().unwrap().push(t);
 }
 
-pub fn find_theme(name: &str) -> Option<&'static (dyn Theme + 'static)> {
-    let themes = global::THEMES.write().unwrap();
+pub fn find_theme(name: &str) -> Option<&'static (dyn ThemeTrait + 'static)> {
+    let themes = all::THEMES.write().unwrap();
     match themes.iter().find(|t| t.name() == name) {
         Some(theme) => Some(*theme),
         _ => None,
diff --git a/pagetop/src/lib.rs b/pagetop/src/lib.rs
index b8485f96..daf0577d 100644
--- a/pagetop/src/lib.rs
+++ b/pagetop/src/lib.rs
@@ -20,5 +20,3 @@ pub mod base;       // Temas, Módulos y Componentes base.
 pub mod util;       // Macros y funciones útiles.
 
 pub mod prelude;    // Re-exporta recursos comunes.
-
-pub use crate::core::server::app::Application;
diff --git a/pagetop/src/locale.rs b/pagetop/src/locale.rs
index 22a01ba6..eac11472 100644
--- a/pagetop/src/locale.rs
+++ b/pagetop/src/locale.rs
@@ -37,8 +37,8 @@ macro_rules! localize {
         fn e(
             key: &str,
             args: &std::collections::HashMap<String, FluentValue>
-        ) -> crate::core::theme::PreEscaped<String> {
-            crate::core::theme::PreEscaped(
+        ) -> crate::core::html::PreEscaped<String> {
+            crate::core::html::PreEscaped(
                 LOCALES.lookup_with_args(&LANGID, key, args)
             )
         }
diff --git a/pagetop/src/prelude.rs b/pagetop/src/prelude.rs
index f0a4b031..1dd8bd79 100644
--- a/pagetop/src/prelude.rs
+++ b/pagetop/src/prelude.rs
@@ -8,10 +8,12 @@ pub use crate::localize;
 #[cfg(any(feature = "mysql", feature = "postgres", feature = "sqlite"))]
 pub use crate::{db, db_migrations};
 
+pub use crate::core::html::*;
 pub use crate::core::theme::*;
 pub use crate::core::module::*;
 pub use crate::core::response::page::*;
 pub use crate::core::server;
+pub use crate::core::server::app::{Application, essence};
 
 pub use crate::base::component::*;
 
diff --git a/pagetop/tests/health_check.rs b/pagetop/tests/health_check.rs
index 0c309bea..dd980796 100644
--- a/pagetop/tests/health_check.rs
+++ b/pagetop/tests/health_check.rs
@@ -1,7 +1,8 @@
-use pagetop::core::server;
-
-fn spawn_app() {
-    let server = server::run(None).expect("Failed to bind address");
+async fn spawn_app() {
+    let server = pagetop::Application::prepare(None)
+        .await?
+        .run()?
+        .expect("Failed to prepare server");
     let _ = tokio::spawn(server);
 }