Customize the Microsoft Graph SDK service client

The Microsoft Graph SDK client configures a default set of middleware that allows the SDK to communicate with the Microsoft Graph endpoints. This default set is customizable, allowing you to change the behavior of the client. For example, you can insert customized logging, or add a test handler to simulate specific scenarios. You can add and remove middleware components. It is important to note that the order in which middleware components run is significant.

var handlers = GraphClientFactory.CreateDefaultHandlers(authProvider);

// Remove a default handler
var compressionHandler =
    handlers.Where(h => h is CompressionHandler).FirstOrDefault();

// Add a new one
// ChaosHandler simulates random server failures
handlers.Add(new ChaosHandler());

var httpClient = GraphClientFactory.Create(handlers);

var customGraphClient = new GraphServiceClient(httpClient);

var messages = await customGraphClient.Me.Messages.Request()
    .Select(m => m.Subject)