add IntoFuture impl for Response and ResponseBuilder

src/header/common/mod.rs

@@ -81,7 +81,7 @@ macro_rules! test_header {
             let a: Vec<Vec<u8>> = raw.iter().map(|x| x.to_vec()).collect();
             let mut req = test::TestRequest::default();
             for item in a {
-                req = req.header(HeaderField::name(), item);
+                req = req.header(HeaderField::name(), item).take();
             }
             let req = req.finish();
             let value = HeaderField::parse(&req);
@@ -108,7 +108,7 @@ macro_rules! test_header {
             let a: Vec<Vec<u8>> = $raw.iter().map(|x| x.to_vec()).collect();
             let mut req = test::TestRequest::default();
             for item in a {
-                req = req.header(HeaderField::name(), item);
+                req.header(HeaderField::name(), item);
             }
             let req = req.finish();
             let val = HeaderField::parse(&req);

src/response.rs

@@ -4,6 +4,7 @@ use std::{fmt, str};
 
 use bytes::{BufMut, Bytes, BytesMut};
 use cookie::{Cookie, CookieJar};
+use futures::future::{ok, FutureResult, IntoFuture};
 use futures::Stream;
 use http::header::{self, HeaderName, HeaderValue};
 use http::{Error as HttpError, HeaderMap, HttpTryFrom, StatusCode};
@@ -276,6 +277,16 @@ impl<B: MessageBody> fmt::Debug for Response<B> {
     }
 }
 
+impl IntoFuture for Response {
+    type Item = Response;
+    type Error = Error;
+    type Future = FutureResult<Response, Error>;
+
+    fn into_future(self) -> Self::Future {
+        ok(self)
+    }
+}
+
 pub struct CookieIter<'a> {
     iter: header::ValueIter<'a, HeaderValue>,
 }
@@ -679,6 +690,16 @@ fn parts<'a>(
     parts.as_mut()
 }
 
+impl IntoFuture for ResponseBuilder {
+    type Item = Response;
+    type Error = Error;
+    type Future = FutureResult<Response, Error>;
+
+    fn into_future(mut self) -> Self::Future {
+        ok(self.finish())
+    }
+}
+
 /// Helper converters
 impl<I: Into<Response>, E: Into<Error>> From<Result<I, E>> for Response {
     fn from(res: Result<I, E>) -> Self {