[System] HttpWebRequest::Headers setter was only setting local variable. Fixes #42408

diff --git a/mcs/class/System/System.Net/HttpWebRequest.cs b/mcs/class/System/System.Net/HttpWebRequest.cs
index 25a5d2877fdc4e4d6409f3c4d8a14b26469593e6..9f94783258dfa6a4067bebd666584507334cfd6c 100644 (file)
--- a/mcs/class/System/System.Net/HttpWebRequest.cs
+++ b/mcs/class/System/System.Net/HttpWebRequest.cs
@@ -450,7 +450,7 @@ namespace System.Net
                                        newWebHeaders.Add(headerName,webHeaders[headerName]);
                                }
 
-                               webHeaders = newWebHeaders;
+                               this.webHeaders = newWebHeaders;
                        }
                }