> For clean Markdown content of this page, append .md to this URL. For the complete documentation index, see https://buildwithfern.com/learn/llms.txt. ## 1.12.0-rc14 **`(feat):`** Add support for overriding literal global headers via the `ClientOptions` class. ## 1.12.0-rc13 **`(feat):`** Add support for receiving additional properties in object types with the new `AdditionalProperties` field. This is useful when you want to parse an object that has properties that are not available in the SDK (e.g. alpha and/or undocumented properties). ```csharp // Call the endpoint. var response = await client.GetUser(...); // Print the additional properties. Console.WriteLine(response.AdditionalProperties); ```