fixing a few issues in httpx

Author: its-a-feature

Payload_Type/apollo/apollo/agent_code/HttpxTransform/Transforms.cs

@@ -39,7 +39,7 @@ public static byte[] Base64Decode(byte[] data)
         public static byte[] Base64UrlEncode(byte[] data)
         {
             string base64 = Convert.ToBase64String(data);
-            base64 = base64.Replace('+', '-').Replace('/', '_').TrimEnd('=');
+            base64 = base64.Replace('+', '-').Replace('/', '_');//.TrimEnd('=');
             return Encoding.UTF8.GetBytes(base64);
         }