Describe the bug

Contracts should be serializable/deserializable using System.Text.Json
public ProxyMatch Match { get; private set; } = new ProxyMatch();

Private setters are not supported by System.Text.Json

To Reproduce

Try to read the ReverseProxy configuration with System.Text.Json - Match object is created but has null values for all properties.

Further technical details

• Include the version of the packages you are using - 1.0.0-preview.4.20373.1
• The platform (Linux/macOS/Windows) - Windows