Imported Upstream version 6.0.0.172

Former-commit-id: f3cc9b82f3e5bd8f0fd3ebc098f789556b44e9cd

mcs/class/System.Net.Http/HeaderUtils.Legacy.cs

@@ -0,0 +1,18 @@
+using System.Collections.Generic;
+using System.Net.Http.Headers;
+
+namespace System.Net.Http
+{
+	static class HeaderUtils
+	{
+		internal static bool IsContentHeader (string name)
+		{
+			return HttpHeaders.GetKnownHeaderKind (name) == Headers.HttpHeaderKind.Content;
+		}
+
+		internal static string GetSingleHeaderString (string name, IEnumerable<string> values)
+		{
+			return HttpRequestHeaders.GetSingleHeaderString (name, values);
+		}
+	}
+}