From 56a64a6ff027c7c561cbefd26beca824f22c98f3 Mon Sep 17 00:00:00 2001
From: James Newton-King <james@newtonking.com>
Date: Thu, 12 Mar 2020 09:52:12 +1300
Subject: [PATCH] Avoid string allocation when converting zero (#19732)

---
 src/Http/Headers/src/HeaderUtilities.cs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/Http/Headers/src/HeaderUtilities.cs b/src/Http/Headers/src/HeaderUtilities.cs
index ff5bb5400c..ac193c0c38 100644
--- a/src/Http/Headers/src/HeaderUtilities.cs
+++ b/src/Http/Headers/src/HeaderUtilities.cs
@@ -562,6 +562,11 @@ namespace Microsoft.Net.Http.Headers
                 throw new ArgumentOutOfRangeException(nameof(value), value, "The value to be formatted must be non-negative.");
             }
 
+            if (value == 0)
+            {
+                return "0";
+            }
+
             var position = _int64MaxStringLength;
             char* charBuffer = stackalloc char[_int64MaxStringLength];