diff --git a/examples/parallel_sites.rs b/examples/parallel_sites.rs
index 794e9fc..28036fe 100644
--- a/examples/parallel_sites.rs
+++ b/examples/parallel_sites.rs
@@ -17,7 +17,7 @@ impl EzSite {
 }
 
 impl HttpServer for EzSite {
-    async fn on_request(&mut self, req: &HttpRequest) -> Option<HttpResponse> {
+    async fn on_request(&self, req: &HttpRequest) -> Option<HttpResponse> {
         // println!("{} > {} {}", req.addr, req.method, req.page);
 
         if req.page == "/" {
diff --git a/examples/simple_site.rs b/examples/simple_site.rs
index 0e8d345..3714487 100644
--- a/examples/simple_site.rs
+++ b/examples/simple_site.rs
@@ -12,7 +12,7 @@ impl EzSite {
         }
     }
 
-    fn ok_response(&mut self, content: String) -> HttpResponse {
+    fn ok_response(&self, content: String) -> HttpResponse {
         HttpResponse::from_string(
             Headers::from(vec![("Content-Type", "text/html")]),
             "200 OK".to_string(),
@@ -20,7 +20,7 @@ impl EzSite {
         )
     }
 
-    fn not_found_response(&mut self, content: String) -> HttpResponse {
+    fn not_found_response(&self, content: String) -> HttpResponse {
         HttpResponse::from_string(
             Headers::from(vec![("Content-Type", "text/html")]),
             "404 Not Found".to_string(),
@@ -28,7 +28,7 @@ impl EzSite {
         )
     }
 
-    async fn get_main_page(&mut self, req: &HttpRequest) -> Option<HttpResponse> {
+    async fn get_main_page(&self, req: &HttpRequest) -> Option<HttpResponse> {
         if req.page == "/" {
             Some(self.ok_response(self.main_page.clone()))
         } else {
@@ -36,13 +36,13 @@ impl EzSite {
         }
     }
 
-    async fn get_unknown_page(&mut self, req: &HttpRequest) -> Option<HttpResponse> {
+    async fn get_unknown_page(&self, req: &HttpRequest) -> Option<HttpResponse> {
         Some(self.not_found_response(format!("<h1>404 Error</h1>Not Found {}", &req.page)))
     }
 }
 
 impl HttpServer for EzSite {
-    async fn on_request(&mut self, req: &HttpRequest) -> Option<HttpResponse> {
+    async fn on_request(&self, req: &HttpRequest) -> Option<HttpResponse> {
         println!("{} > {} {}", req.addr, req.method, req.page);
 
         if let Some(resp) = self.get_main_page(req).await {
diff --git a/src/ezhttp/handler.rs b/src/ezhttp/handler.rs
index d6462a2..d012b8b 100644
--- a/src/ezhttp/handler.rs
+++ b/src/ezhttp/handler.rs
@@ -1,18 +1,18 @@
-use super::{HttpError, HttpRequest, HttpServer, Stream};
+use super::{HttpRequest, HttpServer, Stream};
 
 use std::{future::Future, pin::Pin, sync::Arc};
-use tokio::{net::TcpStream, sync::Mutex};
+use tokio::{net::TcpStream, sync::RwLock};
 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>;
+pub type Handler<T> = Box<dyn Fn(Arc<RwLock<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>>, 
+pub async fn handler_connection<S: HttpServer + Send + 'static + Sync>(
+    server: Arc<RwLock<S>>, 
     mut sock: Stream
 ) {
     let Ok(addr) = sock.get_ref().peer_addr() else { return; };
@@ -20,23 +20,27 @@ pub async fn handler_connection<S: HttpServer + Send + 'static>(
     let req = match HttpRequest::read(sock.get_mut(), &addr).await {
         Ok(i) => i,
         Err(e) => {
-            server.lock().await.on_error(e).await;
+            server.write().await.on_error(e).await;
             return;
         }
     };
 
-    let resp = match server.lock().await.on_request(&req).await {
+    let resp = match server.read().await.on_request(&req).await {
         Some(i) => i,
         None => {
-            server.lock().await.on_error(HttpError::RequstError).await;
-            return;
+            match server.write().await.on_request_mut(&req).await {
+                Some(i) => i,
+                None => {
+                    return;
+                }
+            }
         }
     };
 
     match resp.write(sock.get_mut()).await {
         Ok(_) => {},
         Err(e) => {
-            server.lock().await.on_error(e).await;
+            server.write().await.on_error(e).await;
             return;
         },
     }
@@ -51,14 +55,14 @@ macro_rules! pin_handler {
 
 #[cfg(feature = "http_rrs")]
 /// HTTP_RRS handler
-pub async fn handler_http_rrs<S: HttpServer + Send + 'static>(
-    server: Arc<Mutex<S>>,
+pub async fn handler_http_rrs<S: HttpServer + Send + 'static + Sync>(
+    server: Arc<RwLock<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;
+            server.write().await.on_error(e).await;
             return;
         }
     }
@@ -69,23 +73,27 @@ pub async fn handler_http_rrs<S: HttpServer + Send + 'static>(
     let req = match HttpRequest::read(sock.get_mut(), &addr).await {
         Ok(i) => i,
         Err(e) => {
-            server.lock().await.on_error(e).await;
+            server.write().await.on_error(e).await;
             return;
         }
     };
 
-    let resp = match server.lock().await.on_request(&req).await {
+    let resp = match server.read().await.on_request(&req).await {
         Some(i) => i,
         None => {
-            server.lock().await.on_error(HttpError::RequstError).await;
-            return;
+            match server.write().await.on_request_mut(&req).await {
+                Some(i) => i,
+                None => {
+                    return;
+                }
+            }
         }
     };
 
     match resp.write(sock.get_mut()).await {
         Ok(_) => {},
         Err(e) => {
-            server.lock().await.on_error(e).await;
+            server.write().await.on_error(e).await;
             return;
         },
     }
diff --git a/src/ezhttp/mod.rs b/src/ezhttp/mod.rs
index 9a17643..9d5e268 100644
--- a/src/ezhttp/mod.rs
+++ b/src/ezhttp/mod.rs
@@ -10,7 +10,7 @@ use std::{
 use tokio::io::AsyncReadExt;
 use rusty_pool::ThreadPool;
 use tokio::net::{TcpListener, TcpStream};
-use tokio::sync::Mutex;
+use tokio::sync::RwLock;
 use tokio_io_timeout::TimeoutStream;
 
 pub mod error;
@@ -27,6 +27,8 @@ pub use response::*;
 pub use starter::*;
 pub use handler::*;
 
+use crate::pin_handler;
+
 
 async fn read_line(data: &mut (impl AsyncReadExt + Unpin)) -> Result<String, HttpError> {
     let mut line = Vec::new();
@@ -64,9 +66,15 @@ pub trait HttpServer {
     fn on_start(&mut self, host: &str) -> impl Future<Output = ()> + Send;
     fn on_close(&mut self) -> impl Future<Output = ()> + Send;
     fn on_request(
-        &mut self,
+        &self,
         req: &HttpRequest,
     ) -> impl Future<Output = Option<HttpResponse>> + Send;
+    fn on_request_mut(
+        &mut self,
+        _: &HttpRequest,
+    ) -> impl Future<Output = Option<HttpResponse>> + Send {
+        async { None }
+    }
     fn on_error(
         &mut self, 
         _: HttpError
@@ -87,12 +95,12 @@ where
     T: HttpServer + Send + 'static,
 {
     let threadpool = ThreadPool::new(threads, threads * 10, Duration::from_secs(60));
-    let server = Arc::new(Mutex::new(server));
+    let server = Arc::new(RwLock::new(server));
     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;
+    server_clone.write().await.on_start(&host_clone).await;
 
     while running.load(Ordering::Acquire) {
         let Ok((sock, _)) = listener.accept().await else { continue; };
@@ -108,7 +116,7 @@ where
 
     threadpool.join();
 
-    server.lock().await.on_close().await;
+    server.write().await.on_close().await;
 
     Ok(())
 }
@@ -123,12 +131,12 @@ async fn start_server_new_thread<T>(
 where
     T: HttpServer + Send + 'static,
 {
-    let server = Arc::new(Mutex::new(server));
+    let server = Arc::new(RwLock::new(server));
     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;
+    server_clone.write().await.on_start(&host_clone).await;
 
     while running.load(Ordering::Acquire) {
         let Ok((sock, _)) = listener.accept().await else { continue; };
@@ -142,7 +150,7 @@ where
         tokio::spawn((&handler)(now_server, sock));
     }
 
-    server.lock().await.on_close().await;
+    server.write().await.on_close().await;
 
     Ok(())
 }
@@ -157,12 +165,12 @@ async fn start_server_sync<T>(
 where
     T: HttpServer + Send + 'static,
 {
-    let server = Arc::new(Mutex::new(server));
+    let server = Arc::new(RwLock::new(server));
     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;
+    server_clone.write().await.on_start(&host_clone).await;
 
     while running.load(Ordering::Acquire) {
         let Ok((sock, _)) = listener.accept().await else { continue; };
@@ -176,7 +184,7 @@ where
         handler(now_server, sock).await;
     }
 
-    server.lock().await.on_close().await;
+    server.write().await.on_close().await;
 
     Ok(())
 }
@@ -184,7 +192,7 @@ where
 /// Start [`HttpServer`](HttpServer) on some host
 ///
 /// Use [`HttpServerStarter`](HttpServerStarter) to set more options
-pub async fn start_server<T: HttpServer + Send + 'static>(
+pub async fn start_server<T: HttpServer + Send + 'static + Sync>(
     server: T, 
     host: &str
 ) -> Result<(), Box<dyn Error>> {
@@ -192,7 +200,7 @@ pub async fn start_server<T: HttpServer + Send + 'static>(
         server,
         host,
         None,
-        Box::new(move |a, b| Box::pin(handler_connection(a, b))),
+        pin_handler!(handler_connection),
         Arc::new(AtomicBool::new(true)),
     ).await
 }
diff --git a/src/ezhttp/starter.rs b/src/ezhttp/starter.rs
index decc285..120e2e7 100644
--- a/src/ezhttp/starter.rs
+++ b/src/ezhttp/starter.rs
@@ -39,7 +39,7 @@ pub struct HttpServerStarter<T: HttpServer + Send + 'static> {
     threads: usize,
 }
 
-impl<T: HttpServer + Send + 'static> HttpServerStarter<T> {
+impl<T: HttpServer + Send + 'static + Sync> HttpServerStarter<T> {
     /// Create new HttpServerStarter
     pub fn new(http_server: T, host: &str) -> Self {
         HttpServerStarter {
diff --git a/src/main.rs b/src/main.rs
index 3e4de53..538ceaf 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -14,7 +14,7 @@ impl EzSite {
 }
 
 impl HttpServer for EzSite {
-    async fn on_request(&mut self, req: &HttpRequest) -> Option<HttpResponse> {
+    async fn on_request(&self, req: &HttpRequest) -> Option<HttpResponse> {
         println!("{} > {} {}", req.addr, req.method, req.page);
 
         if req.page == "/" {