allow to specify upgrade service

actix-http/src/h1/upgrade.rs

@@ -0,0 +1,40 @@
+use std::marker::PhantomData;
+
+use actix_codec::Framed;
+use actix_service::{NewService, Service};
+use futures::future::FutureResult;
+use futures::{Async, Poll};
+
+use crate::error::Error;
+use crate::h1::Codec;
+use crate::request::Request;
+
+pub struct UpgradeHandler<T>(PhantomData<T>);
+
+impl<T> NewService for UpgradeHandler<T> {
+    type Request = (Request, Framed<T, Codec>);
+    type Response = ();
+    type Error = Error;
+    type Service = UpgradeHandler<T>;
+    type InitError = Error;
+    type Future = FutureResult<Self::Service, Self::InitError>;
+
+    fn new_service(&self, _: &()) -> Self::Future {
+        unimplemented!()
+    }
+}
+
+impl<T> Service for UpgradeHandler<T> {
+    type Request = (Request, Framed<T, Codec>);
+    type Response = ();
+    type Error = Error;
+    type Future = FutureResult<Self::Response, Self::Error>;
+
+    fn poll_ready(&mut self) -> Poll<(), Self::Error> {
+        Ok(Async::Ready(()))
+    }
+
+    fn call(&mut self, _: Self::Request) -> Self::Future {
+        unimplemented!()
+    }
+}