diff --git a/Cargo.lock b/Cargo.lock
index 0f04e3c..dfce6bd 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -87,6 +87,7 @@ dependencies = [
  "rusty_pool",
  "serde_json",
  "tokio",
+ "tokio-io-timeout",
  "urlencoding",
 ]
 
@@ -374,9 +375,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.125"
+version = "1.0.127"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "83c8e735a073ccf5be70aa8066aa984eaf2fa000db6c8d0100ae605b366d31ed"
+checksum = "8043c06d9f82bd7271361ed64f415fe5e12a77fdb52e573e7f06a516dea329ad"
 dependencies = [
  "itoa",
  "memchr",
@@ -453,6 +454,16 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "tokio-io-timeout"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "30b74022ada614a1b4834de765f9bb43877f910cc8ce4be40e89042c9223a8bf"
+dependencies = [
+ "pin-project-lite",
+ "tokio",
+]
+
 [[package]]
 name = "tokio-macros"
 version = "2.4.0"
diff --git a/Cargo.toml b/Cargo.toml
index cf2186c..4a7d1d9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,6 +11,10 @@ keywords = ["http", "server", "site", "async"]
 
 [dependencies]
 urlencoding = "2.1.3"
-serde_json = "1.0.125"
+serde_json = "1.0.127"
 tokio = { version = "1.39.3", features = ["full"] }
-rusty_pool = "0.7.0"
\ No newline at end of file
+rusty_pool = "0.7.0"
+tokio-io-timeout = "1.2.0"
+
+[features]
+http_rrs = []
\ No newline at end of file
diff --git a/src/ezhttp/error.rs b/src/ezhttp/error.rs
index e2086c6..9392f45 100644
--- a/src/ezhttp/error.rs
+++ b/src/ezhttp/error.rs
@@ -13,6 +13,7 @@ pub enum HttpError {
     WriteHeadError,
     WriteBodyError,
     InvalidStatus,
+    RequstError
 }
 
 impl std::fmt::Display for HttpError {
diff --git a/src/ezhttp/handler.rs b/src/ezhttp/handler.rs
new file mode 100644
index 0000000..f8dd978
--- /dev/null
+++ b/src/ezhttp/handler.rs
@@ -0,0 +1,86 @@
+use super::{HttpError, HttpRequest, HttpServer, Stream};
+
+use std::{future::Future, pin::Pin, sync::Arc};
+use tokio::{net::TcpStream, sync::Mutex};
+use tokio_io_timeout::TimeoutStream;
+
+#[cfg(feature = "http_rrs")]
+use {super::read_line_lf, std::net::{ToSocketAddrs, SocketAddr}};
+
+pub type Handler<T> = Box<dyn Fn(Arc<Mutex<T>>, TimeoutStream<TcpStream>) -> Pin<Box<dyn Future<Output = ()> + Send>> + Send + Sync>;
+
+
+/// Default connection handler
+/// Turns input to request and response to output
+pub async fn handler_connection<S: HttpServer + Send + 'static>(
+    server: Arc<Mutex<S>>, 
+    mut sock: Stream
+) {
+    let Ok(addr) = sock.get_ref().peer_addr() else { return; };
+
+    let req = match HttpRequest::read(sock.get_mut(), &addr).await {
+        Ok(i) => i,
+        Err(e) => {
+            server.lock().await.on_error(e).await;
+            return;
+        }
+    };
+
+    let resp = match server.lock().await.on_request(&req).await {
+        Some(i) => i,
+        None => {
+            server.lock().await.on_error(HttpError::RequstError).await;
+            return;
+        }
+    };
+
+    match resp.write(sock.get_mut()).await {
+        Ok(_) => {},
+        Err(e) => {
+            server.lock().await.on_error(e).await;
+            return;
+        },
+    }
+}
+
+#[cfg(feature = "http_rrs")]
+/// HTTP_RRS handler
+pub async fn handler_http_rrs<S: HttpServer + Send + 'static>(
+    server: Arc<Mutex<S>>,
+    mut sock: Stream,
+) {
+    let addr = match read_line_lf(sock.get_mut()).await {
+        Ok(i) => i,
+        Err(e) => {
+            server.lock().await.on_error(e).await;
+            return;
+        }
+    }
+    .to_socket_addrs()
+    .unwrap()
+    .collect::<Vec<SocketAddr>>()[0];
+
+    let req = match HttpRequest::read(sock.get_mut(), &addr).await {
+        Ok(i) => i,
+        Err(e) => {
+            server.lock().await.on_error(e).await;
+            return;
+        }
+    };
+
+    let resp = match server.lock().await.on_request(&req).await {
+        Some(i) => i,
+        None => {
+            server.lock().await.on_error(HttpError::RequstError).await;
+            return;
+        }
+    };
+
+    match resp.write(sock.get_mut()).await {
+        Ok(_) => {},
+        Err(e) => {
+            server.lock().await.on_error(e).await;
+            return;
+        },
+    }
+}
\ No newline at end of file
diff --git a/src/ezhttp/mod.rs b/src/ezhttp/mod.rs
index 15c8d89..397a9dd 100644
--- a/src/ezhttp/mod.rs
+++ b/src/ezhttp/mod.rs
@@ -1,94 +1,64 @@
+use std::sync::atomic::{AtomicBool, Ordering};
 use std::{
     boxed::Box,
     error::Error,
     future::Future,
-    io::Read,
-    net::{TcpListener, TcpStream},
-    sync::{
-        atomic::{AtomicBool, Ordering},
-        Arc,
-    },
+    sync::Arc,
     time::Duration,
 };
 
+use tokio::io::AsyncReadExt;
+use rusty_pool::ThreadPool;
+use tokio::net::{TcpListener, TcpStream};
+use tokio::sync::Mutex;
+use tokio_io_timeout::TimeoutStream;
+
 pub mod error;
 pub mod headers;
 pub mod request;
 pub mod response;
 pub mod starter;
+pub mod handler;
 
 pub use error::*;
 pub use headers::*;
 pub use request::*;
 pub use response::*;
-use rusty_pool::ThreadPool;
 pub use starter::*;
-use tokio::sync::Mutex;
+pub use handler::*;
 
-fn read_line(data: &mut impl Read) -> Result<String, HttpError> {
-    let mut bytes = Vec::new();
 
-    for byte in data.bytes() {
-        let byte = match byte {
-            Ok(i) => i,
-            Err(_) => return Err(HttpError::ReadLineEof),
-        };
 
-        bytes.push(byte);
-
-        if byte == 0x0A {
+async fn read_line(data: &mut (impl AsyncReadExt + Unpin)) -> Result<String, HttpError> {
+    let mut line = Vec::new();
+    loop {
+        let mut buffer = vec![0;1];
+        data.read_exact(&mut buffer).await.or(Err(HttpError::ReadLineEof))?;
+        let char = buffer[0];
+        line.push(char);
+        if char == 0x0a {
             break;
         }
     }
-
-    match String::from_utf8(bytes) {
-        Ok(i) => Ok(i),
-        Err(_) => Err(HttpError::ReadLineUnknown),
-    }
+    String::from_utf8(line).or(Err(HttpError::ReadLineUnknown))
 }
 
-fn read_line_crlf(data: &mut impl Read) -> Result<String, HttpError> {
-    match read_line(data) {
+async fn read_line_crlf(data: &mut (impl AsyncReadExt + Unpin)) -> Result<String, HttpError> {
+    match read_line(data).await {
         Ok(i) => Ok(i[..i.len() - 2].to_string()),
         Err(e) => Err(e),
     }
 }
 
-fn read_line_lf(data: &mut impl Read) -> Result<String, HttpError> {
-    match read_line(data) {
+#[cfg(feature = "http_rrs")]
+async fn read_line_lf(data: &mut (impl AsyncReadExt + Unpin)) -> Result<String, HttpError> {
+    match read_line(data).await {
         Ok(i) => Ok(i[..i.len() - 1].to_string()),
         Err(e) => Err(e),
     }
 }
 
-fn rem_first(value: &str) -> &str {
-    let mut chars = value.chars();
-    chars.next();
-    chars.as_str()
-}
-
-fn split(text: String, delimiter: &str, times: usize) -> Vec<String> {
-    match times {
-        0 => text.split(delimiter).map(|v| v.to_string()).collect(),
-        1 => {
-            let mut v: Vec<String> = Vec::new();
-            match text.split_once(delimiter) {
-                Some(i) => {
-                    v.push(i.0.to_string());
-                    v.push(i.1.to_string());
-                }
-                None => {
-                    v.push(text);
-                }
-            }
-            v
-        }
-        _ => text
-            .splitn(times, delimiter)
-            .map(|v| v.to_string())
-            .collect(),
-    }
-}
+pub type Stream = TimeoutStream<TcpStream>;
 
 /// Async http server trait
 pub trait HttpServer {
@@ -98,45 +68,43 @@ pub trait HttpServer {
         &mut self,
         req: &HttpRequest,
     ) -> impl Future<Output = Option<HttpResponse>> + Send;
+    fn on_error(
+        &mut self, 
+        _: HttpError
+    ) -> impl Future<Output = ()> + Send {
+        async {}
+    }
 }
 
-async fn start_server_with_threadpool<S>(
-    server: S,
+async fn start_server_with_threadpool<T>(
+    server: T,
     host: &str,
     timeout: Option<Duration>,
     threads: usize,
-    rrs: bool,
+    handler: Handler<T>,
     running: Arc<AtomicBool>,
 ) -> Result<(), Box<dyn Error>>
 where
-    S: HttpServer + Send + 'static,
+    T: HttpServer + Send + 'static,
 {
     let threadpool = ThreadPool::new(threads, threads * 10, Duration::from_secs(60));
     let server = Arc::new(Mutex::new(server));
-    let listener = TcpListener::bind(host)?;
+    let listener = TcpListener::bind(host).await?;
 
     let host_clone = String::from(host).clone();
     let server_clone = server.clone();
     server_clone.lock().await.on_start(&host_clone).await;
 
     while running.load(Ordering::Acquire) {
-        let (sock, _) = match listener.accept() {
-            Ok(i) => i,
-            Err(_) => {
-                continue;
-            }
-        };
+        let Ok((sock, _)) = listener.accept().await else { continue; };
+        let mut sock = TimeoutStream::new(sock);
 
-        sock.set_read_timeout(timeout).unwrap();
-        sock.set_write_timeout(timeout).unwrap();
+        sock.set_read_timeout(timeout);
+        sock.set_write_timeout(timeout);
 
         let now_server = Arc::clone(&server);
 
-        if !rrs {
-            threadpool.spawn(handle_connection(now_server, sock));
-        } else {
-            threadpool.spawn(handle_connection_rrs(now_server, sock));
-        }
+        threadpool.spawn((&handler)(now_server, sock));
     }
 
     threadpool.join();
@@ -146,41 +114,33 @@ where
     Ok(())
 }
 
-async fn start_server_new_thread<S>(
-    server: S,
+async fn start_server_new_thread<T>(
+    server: T,
     host: &str,
     timeout: Option<Duration>,
-    rrs: bool,
+    handler: Handler<T>,
     running: Arc<AtomicBool>,
 ) -> Result<(), Box<dyn Error>>
 where
-    S: HttpServer + Send + 'static,
+    T: HttpServer + Send + 'static,
 {
     let server = Arc::new(Mutex::new(server));
-    let listener = TcpListener::bind(host)?;
+    let listener = TcpListener::bind(host).await?;
 
     let host_clone = String::from(host).clone();
     let server_clone = server.clone();
     server_clone.lock().await.on_start(&host_clone).await;
 
     while running.load(Ordering::Acquire) {
-        let (sock, _) = match listener.accept() {
-            Ok(i) => i,
-            Err(_) => {
-                continue;
-            }
-        };
+        let Ok((sock, _)) = listener.accept().await else { continue; };
+        let mut sock = TimeoutStream::new(sock);
 
-        sock.set_read_timeout(timeout).unwrap();
-        sock.set_write_timeout(timeout).unwrap();
+        sock.set_read_timeout(timeout);
+        sock.set_write_timeout(timeout);
 
         let now_server = Arc::clone(&server);
 
-        if !rrs {
-            tokio::spawn(handle_connection(now_server, sock));
-        } else {
-            tokio::spawn(handle_connection_rrs(now_server, sock));
-        }
+        tokio::spawn((&handler)(now_server, sock));
     }
 
     server.lock().await.on_close().await;
@@ -188,41 +148,33 @@ where
     Ok(())
 }
 
-async fn start_server_sync<S>(
-    server: S,
+async fn start_server_sync<T>(
+    server: T,
     host: &str,
     timeout: Option<Duration>,
-    rrs: bool,
+    handler: Handler<T>,
     running: Arc<AtomicBool>,
 ) -> Result<(), Box<dyn Error>>
 where
-    S: HttpServer + Send + 'static,
+    T: HttpServer + Send + 'static,
 {
     let server = Arc::new(Mutex::new(server));
-    let listener = TcpListener::bind(host)?;
+    let listener = TcpListener::bind(host).await?;
 
     let host_clone = String::from(host).clone();
     let server_clone = server.clone();
     server_clone.lock().await.on_start(&host_clone).await;
 
     while running.load(Ordering::Acquire) {
-        let (sock, _) = match listener.accept() {
-            Ok(i) => i,
-            Err(_) => {
-                continue;
-            }
-        };
+        let Ok((sock, _)) = listener.accept().await else { continue; };
+        let mut sock = TimeoutStream::new(sock);
 
-        sock.set_read_timeout(timeout).unwrap();
-        sock.set_write_timeout(timeout).unwrap();
+        sock.set_read_timeout(timeout);
+        sock.set_write_timeout(timeout);
 
         let now_server = Arc::clone(&server);
 
-        if !rrs {
-            handle_connection(now_server, sock).await;
-        } else {
-            handle_connection_rrs(now_server, sock).await;
-        }
+        handler(now_server, sock).await;
     }
 
     server.lock().await.on_close().await;
@@ -230,60 +182,18 @@ where
     Ok(())
 }
 
-async fn handle_connection<S: HttpServer + Send + 'static>(
-    server: Arc<Mutex<S>>, 
-    mut sock: TcpStream
-) {
-    let Ok(addr) = sock.peer_addr() else { return; };
-
-    let req = match HttpRequest::read(&mut sock, &addr) {
-        Ok(i) => i,
-        Err(_) => {
-            return;
-        }
-    };
-
-    let resp = match server.lock().await.on_request(&req).await {
-        Some(i) => i,
-        None => {
-            return;
-        }
-    };
-
-    let _ = resp.write(&mut sock);
-}
-
-async fn handle_connection_rrs<S: HttpServer + Send + 'static>(
-    server: Arc<Mutex<S>>,
-    mut sock: TcpStream,
-) {
-    let req = match HttpRequest::read_with_rrs(&mut sock) {
-        Ok(i) => i,
-        Err(_) => {
-            return;
-        }
-    };
-    let resp = match server.lock().await.on_request(&req).await {
-        Some(i) => i,
-        None => {
-            return;
-        }
-    };
-    let _ = resp.write(&mut sock);
-}
-
 /// Start [`HttpServer`](HttpServer) on some host
 ///
 /// Use [`HttpServerStarter`](HttpServerStarter) to set more options
-pub async fn start_server<S: HttpServer + Send + 'static>(
-    server: S, 
+pub async fn start_server<T: HttpServer + Send + 'static>(
+    server: T, 
     host: &str
 ) -> Result<(), Box<dyn Error>> {
     start_server_new_thread(
         server,
         host,
         None,
-        false,
+        Box::new(move |a, b| Box::pin(handler_connection(a, b))),
         Arc::new(AtomicBool::new(true)),
     ).await
 }
diff --git a/src/ezhttp/request.rs b/src/ezhttp/request.rs
index 5590905..97ae2f4 100644
--- a/src/ezhttp/request.rs
+++ b/src/ezhttp/request.rs
@@ -1,11 +1,11 @@
-use super::{read_line_crlf, read_line_lf, rem_first, split, Headers, HttpError};
+use super::{read_line_crlf, Headers, HttpError};
 
 use serde_json::Value;
 use std::{
     fmt::{Debug, Display},
-    io::{Read, Write},
-    net::{IpAddr, SocketAddr, ToSocketAddrs},
+    net::SocketAddr,
 };
+use tokio::io::{AsyncReadExt, AsyncWriteExt};
 
 /// Http request
 #[derive(Debug, Clone)]
@@ -38,39 +38,28 @@ impl HttpRequest {
     }
 
     /// Read http request from stream
-    pub fn read(data: &mut impl Read, addr: &SocketAddr) -> Result<HttpRequest, HttpError> {
-        let octets = match addr.ip() {
-            IpAddr::V4(ip) => ip.octets(),
-            _ => [127, 0, 0, 1],
-        };
+    pub async fn read(data: &mut (impl AsyncReadExt + Unpin), addr: &SocketAddr) -> Result<HttpRequest, HttpError> {
+        let ip_str = addr.to_string();
 
-        let ip_str = octets[0].to_string()
-            + "."
-            + &octets[1].to_string()
-            + "."
-            + &octets[2].to_string()
-            + "."
-            + &octets[3].to_string();
-
-        let status = split(
-            match read_line_crlf(data) {
-                Ok(i) => i,
-                Err(e) => return Err(e),
+        let status: Vec<String> = match read_line_crlf(data).await {
+            Ok(i) => {
+                i.splitn(3, " ")
+                    .map(|s| s.to_string())
+                    .collect()
             },
-            " ",
-            3,
-        );
+            Err(e) => return Err(e),
+        };
 
         let method = status[0].clone();
         let (page, query) = match status[1].split_once("?") {
             Some(i) => (i.0.to_string(), Some(i.1)),
-            None => (status[1].clone(), None),
+            None => (status[1].to_string(), None),
         };
 
         let mut headers = Headers::new();
 
         loop {
-            let text = match read_line_crlf(data) {
+            let text = match read_line_crlf(data).await {
                 Ok(i) => i,
                 Err(_) => return Err(HttpError::InvalidHeaders),
             };
@@ -121,7 +110,7 @@ impl HttpRequest {
                 let mut buf: Vec<u8> = Vec::new();
                 buf.resize(content_size - reqdata.len(), 0);
 
-                match data.read_exact(&mut buf) {
+                match data.read_exact(&mut buf).await {
                     Ok(i) => i,
                     Err(_) => return Err(HttpError::InvalidContent),
                 };
@@ -166,7 +155,7 @@ impl HttpRequest {
                 }
                 "application/x-www-form-urlencoded" => {
                     if body.starts_with("?") {
-                        body = rem_first(body.as_str()).to_string()
+                        body = body.as_str()[1..].to_string()
                     }
 
                     for ele in body.split("&") {
@@ -201,20 +190,6 @@ impl HttpRequest {
         })
     }
 
-    /// Read http request with http_rrs support
-    pub fn read_with_rrs(data: &mut impl Read) -> Result<HttpRequest, HttpError> {
-        let addr = match read_line_lf(data) {
-            Ok(i) => i,
-            Err(e) => {
-                return Err(e);
-            }
-        }
-        .to_socket_addrs()
-        .unwrap()
-        .collect::<Vec<SocketAddr>>()[0];
-        HttpRequest::read(data, &addr)
-    }
-
     /// Set params to query in url
     pub fn params_to_page(&mut self) {
         let mut query = String::new();
@@ -246,7 +221,7 @@ impl HttpRequest {
     /// Write http request to stream
     ///
     /// [`params`](Self::params) is not written to the stream, you need to use [`params_to_json`](Self::params_to_json) or [`params_to_page`](Self::params_to_page)
-    pub fn write(self, data: &mut impl Write) -> Result<(), HttpError> {
+    pub async fn write(self, data: &mut (impl AsyncWriteExt + Unpin)) -> Result<(), HttpError> {
         let mut head: String = String::new();
         head.push_str(&self.method);
         head.push_str(" ");
@@ -263,13 +238,13 @@ impl HttpRequest {
 
         head.push_str("\r\n");
 
-        match data.write_all(head.as_bytes()) {
+        match data.write_all(head.as_bytes()).await {
             Ok(i) => i,
             Err(_) => return Err(HttpError::WriteHeadError),
         };
 
         if !self.data.is_empty() {
-            match data.write_all(&self.data) {
+            match data.write_all(&self.data).await {
                 Ok(i) => i,
                 Err(_) => return Err(HttpError::WriteBodyError),
             };
diff --git a/src/ezhttp/response.rs b/src/ezhttp/response.rs
index 8dcb0c6..6beb5ef 100644
--- a/src/ezhttp/response.rs
+++ b/src/ezhttp/response.rs
@@ -1,10 +1,8 @@
 use super::{read_line_crlf, Headers, HttpError};
 
 use serde_json::Value;
-use std::{
-    fmt::{Debug, Display},
-    io::{Read, Write},
-};
+use tokio::io::{AsyncReadExt, AsyncWriteExt};
+use std::fmt::{Debug, Display};
 
 /// Http response
 #[derive(Debug, Clone)]
@@ -61,8 +59,8 @@ impl HttpResponse {
     }
 
     /// Read http response from stream
-    pub fn read(data: &mut impl Read) -> Result<HttpResponse, HttpError> {
-        let status = match read_line_crlf(data) {
+    pub async fn read(data: &mut (impl AsyncReadExt + Unpin)) -> Result<HttpResponse, HttpError> {
+        let status = match read_line_crlf(data).await {
             Ok(i) => i,
             Err(e) => {
                 return Err(e);
@@ -77,7 +75,7 @@ impl HttpResponse {
         let mut headers = Headers::new();
 
         loop {
-            let text = match read_line_crlf(data) {
+            let text = match read_line_crlf(data).await {
                 Ok(i) => i,
                 Err(_) => return Err(HttpError::InvalidHeaders),
             };
@@ -106,7 +104,7 @@ impl HttpResponse {
                 let mut buf: Vec<u8> = Vec::new();
                 buf.resize(content_size - reqdata.len(), 0);
 
-                match data.read_exact(&mut buf) {
+                match data.read_exact(&mut buf).await {
                     Ok(i) => i,
                     Err(_) => return Err(HttpError::InvalidContent),
                 };
@@ -117,7 +115,7 @@ impl HttpResponse {
             loop {
                 let mut buf: Vec<u8> = vec![0; 1024 * 32];
 
-                let buf_len = match data.read(&mut buf) {
+                let buf_len = match data.read(&mut buf).await {
                     Ok(i) => i,
                     Err(_) => {
                         break;
@@ -138,7 +136,7 @@ impl HttpResponse {
     }
 
     /// Write http response to stream
-    pub fn write(self, data: &mut impl Write) -> Result<(), &str> {
+    pub async fn write(self, data: &mut (impl AsyncWriteExt + Unpin)) -> Result<(), HttpError> {
         let mut head: String = String::new();
         head.push_str("HTTP/1.1 ");
         head.push_str(&self.status_code);
@@ -153,14 +151,14 @@ impl HttpResponse {
 
         head.push_str("\r\n");
 
-        match data.write_all(head.as_bytes()) {
+        match data.write_all(head.as_bytes()).await {
             Ok(i) => i,
-            Err(_) => return Err("write head error"),
+            Err(_) => return Err(HttpError::WriteHeadError),
         };
 
-        match data.write_all(&self.data) {
+        match data.write_all(&self.data).await {
             Ok(i) => i,
-            Err(_) => return Err("write body error"),
+            Err(_) => return Err(HttpError::WriteHeadError),
         };
 
         Ok(())
diff --git a/src/ezhttp/starter.rs b/src/ezhttp/starter.rs
index ce7d0b0..30c1f4e 100644
--- a/src/ezhttp/starter.rs
+++ b/src/ezhttp/starter.rs
@@ -1,28 +1,25 @@
 use tokio::task::JoinHandle;
+use tokio::sync::Mutex;
+use tokio::net::TcpStream;
+use tokio_io_timeout::TimeoutStream;
 
 use super::{
-    start_server_new_thread, start_server_sync,
-    start_server_with_threadpool, HttpServer,
+    start_server_new_thread, 
+    start_server_sync,
+    start_server_with_threadpool, 
+    handler_connection,
+    Handler,
+    HttpServer,
 };
 
+use std::pin::Pin;
 use std::{
-    error::Error,
-    sync::{
+    error::Error, future::Future, sync::{
         atomic::{AtomicBool, Ordering},
         Arc,
-    },
-    time::Duration,
+    }, time::Duration
 };
 
-/// Http server start builder
-pub struct HttpServerStarter<T: HttpServer + Send + 'static> {
-    http_server: T,
-    support_http_rrs: bool,
-    timeout: Option<Duration>,
-    host: String,
-    threads: usize,
-}
-
 /// Running http server
 pub struct RunningHttpServer {
     thread: JoinHandle<()>,
@@ -41,12 +38,21 @@ impl RunningHttpServer {
     }
 }
 
+/// Http server start builder
+pub struct HttpServerStarter<T: HttpServer + Send + 'static> {
+    http_server: T,
+    handler: Handler<T>,
+    timeout: Option<Duration>,
+    host: String,
+    threads: usize,
+}
+
 impl<T: HttpServer + Send + 'static> HttpServerStarter<T> {
     /// Create new HttpServerStarter
     pub fn new(http_server: T, host: &str) -> Self {
         HttpServerStarter {
             http_server,
-            support_http_rrs: false,
+            handler: Box::new(move |a, b| Box::pin(handler_connection(a, b))),
             timeout: None,
             host: host.to_string(),
             threads: 0,
@@ -56,25 +62,25 @@ impl<T: HttpServer + Send + 'static> HttpServerStarter<T> {
     /// Set http server
     pub fn http_server(mut self, http_server: T) -> Self {
         self.http_server = http_server;
-        return self;
+        self
     }
 
     /// Set if http_rrs is supported
-    pub fn support_http_rrs(mut self, support_http_rrs: bool) -> Self {
-        self.support_http_rrs = support_http_rrs;
-        return self;
+    pub fn handler(mut self, handler: impl Fn(Arc<Mutex<T>>, TimeoutStream<TcpStream>) -> Pin<Box<dyn Future<Output = ()> + Send>> + Send + Sync + 'static) -> Self {
+        self.handler = Box::new(move |a, b| Box::pin(handler(a, b)));
+        self
     }
 
     /// Set timeout for read & write
     pub fn timeout(mut self, timeout: Option<Duration>) -> Self {
         self.timeout = timeout;
-        return self;
+        self
     }
 
     /// Set host
     pub fn host(mut self, host: String) -> Self {
         self.host = host;
-        return self;
+        self
     }
 
     /// Set threads in threadpool and return builder
@@ -83,17 +89,17 @@ impl<T: HttpServer + Send + 'static> HttpServerStarter<T> {
     /// 1 thread means that all connections are processed in the main thread
     pub fn threads(mut self, threads: usize) -> Self {
         self.threads = threads;
-        return self;
+        self
     }
 
     /// Get http server
-    pub fn get_http_server(self) -> T {
-        self.http_server
+    pub fn get_http_server(&self) -> &T {
+        &self.http_server
     }
 
     /// Get if http_rrs is supported
-    pub fn get_support_http_rrs(&self) -> bool {
-        self.support_http_rrs
+    pub fn get_handler(&self) -> &Handler<T> {
+        &self.handler
     }
 
     /// Get timeout for read & write
@@ -109,7 +115,7 @@ impl<T: HttpServer + Send + 'static> HttpServerStarter<T> {
     /// Get threads in threadpool
     ///
     /// 0 threads means that a new thread is created for each connection \
-    /// 1 thread means that all connections are processed in the main thread
+    /// 1 thread means that all connections are processed in the one thread
     pub fn get_threads(&self) -> usize {
         self.threads
     }
@@ -119,16 +125,16 @@ impl<T: HttpServer + Send + 'static> HttpServerStarter<T> {
         let running = Arc::new(AtomicBool::new(true));
 
         if self.threads == 0 {
-            start_server_new_thread(self.http_server, &self.host, self.timeout, self.support_http_rrs, running).await
+            start_server_new_thread(self.http_server, &self.host, self.timeout, self.handler, running).await
         } else if self.threads == 1 {
-            start_server_sync(self.http_server, &self.host, self.timeout, self.support_http_rrs, running).await
+            start_server_sync(self.http_server, &self.host, self.timeout, self.handler, running).await
         } else {
             start_server_with_threadpool(
                 self.http_server,
                 &self.host,
                 self.timeout,
                 self.threads,
-                self.support_http_rrs,
+                self.handler,
                 running,
             ).await
         }
@@ -145,7 +151,7 @@ impl<T: HttpServer + Send + 'static> HttpServerStarter<T> {
                     self.http_server,
                     &self.host,
                     self.timeout,
-                    self.support_http_rrs,
+                    self.handler,
                     running_clone,
                 ).await
                 .expect("http server error");
@@ -156,7 +162,7 @@ impl<T: HttpServer + Send + 'static> HttpServerStarter<T> {
                     self.http_server,
                     &self.host,
                     self.timeout,
-                    self.support_http_rrs,
+                    self.handler,
                     running_clone,
                 ).await
                 .expect("http server error");
@@ -168,7 +174,7 @@ impl<T: HttpServer + Send + 'static> HttpServerStarter<T> {
                     &self.host,
                     self.timeout,
                     self.threads,
-                    self.support_http_rrs,
+                    self.handler,
                     running_clone,
                 ).await
                 .expect("http server error")