From c4835c506d465a036fa294db275df27095104045 Mon Sep 17 00:00:00 2001
From: Sean McArthur <sean.monstar@gmail.com>
Date: Mon, 26 Jun 2017 11:14:57 -0700
Subject: [PATCH] refactor(http): grab io.write_buf_mut only once in write_head

---
 src/http/conn.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/http/conn.rs b/src/http/conn.rs
index 56a49889..7b91efc9 100644
--- a/src/http/conn.rs
+++ b/src/http/conn.rs
@@ -248,14 +248,15 @@ where I: AsyncRead + AsyncWrite,
 
         let wants_keep_alive = head.should_keep_alive();
         self.state.keep_alive &= wants_keep_alive;
+        let mut buf = self.io.write_buf_mut();
         // if a 100-continue has started but not finished sending, tack the
         // remainder on to the start of the buffer.
         if let Writing::Continue(ref pending) = self.state.writing {
             if pending.has_started() {
-                self.io.write_buf_mut().extend_from_slice(pending.buf());
+                buf.extend_from_slice(pending.buf());
             }
         }
-        let encoder = T::encode(head, self.io.write_buf_mut());
+        let encoder = T::encode(head, buf);
         self.state.writing = if body {
             Writing::Body(encoder, None)
         } else {