From 2063ade162e8c167b5b90f0314ff0a2c1687f1f0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E3=81=82=E3=81=BE=E3=81=BF=E3=82=84=20=E3=82=86=E3=81=86?=
 =?UTF-8?q?=E3=81=93?= <1@1234.sh>
Date: Wed, 4 Nov 2015 10:12:52 +0800
Subject: [PATCH] We have used to `if (Cookies["xxx"] == null)`

We have used to `if (Cookies["xxx"] == null)` to detect the key exist or not.

The String.Empty will equals to "", We have to use Cookies.Keys.Contains("xxx") it's so complex.
---
 src/Microsoft.AspNet.Http/RequestCookieCollection.cs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/Microsoft.AspNet.Http/RequestCookieCollection.cs b/src/Microsoft.AspNet.Http/RequestCookieCollection.cs
index 363b69df..4337ce44 100644
--- a/src/Microsoft.AspNet.Http/RequestCookieCollection.cs
+++ b/src/Microsoft.AspNet.Http/RequestCookieCollection.cs
@@ -48,7 +48,7 @@ public string this[string key]
 
                 if (Store == null)
                 {
-                    return string.Empty;
+                    return null;
                 }
 
                 string value;
@@ -56,7 +56,7 @@ public string this[string key]
                 {
                     return value;
                 }
-                return string.Empty;
+                return null;
             }
         }
         
@@ -232,4 +232,4 @@ public void Reset()
             }
         }
     }
-}
\ No newline at end of file
+}