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Customize the Microsoft Graph SDK service client

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

// tokenCredential is one of the credential classes from Azure.Identity
// scopes is an array of permission scope strings
var authProvider = new AzureIdentityAuthenticationProvider(tokenCredential, isCaeEnabled: true, scopes: scopes);

var handlers = GraphClientFactory.CreateDefaultHandlers();

// ChaosHandler simulates random server failures
// Microsoft.Kiota.Http.HttpClientLibrary.Middleware.ChaosHandler
handlers.Add(new ChaosHandler());

var httpClient = GraphClientFactory.Create(handlers);
var customGraphClient = new GraphServiceClient(httpClient, authProvider);

Configuring the HTTP proxy for the client

Some environments require client applications to use an HTTP proxy before accessing the public internet. This section shows how to configure the proxy for the Microsoft Graph SDKs.

// URI to proxy
var proxyAddress = "http://localhost:8888";

// Create an HttpClientHandler with the proxy to
// pass to the Azure.Identity token credential
var handler = new HttpClientHandler
{
    Proxy = new WebProxy(proxyAddress),
};

// Create an options object that corresponds to the
// token credential being used. For example, this sample
// uses a ClientSecretCredential, so the corresponding
// options object is ClientSecretCredentialOptions
var options = new ClientSecretCredentialOptions()
{
    Transport = new HttpClientTransport(handler),
};

var tokenCredential = new ClientSecretCredential(
    "YOUR_TENANT_ID",
    "YOUR_CLIENT_ID",
    "YOUR_CLIENT_SECRET",
    options);

// NOTE: Authentication requests will not go through the proxy.
// Azure.Identity token credential classes have their own separate method
// for configuring a proxy using TokenCredentialOptions.Transport
var authProvider = new AzureIdentityAuthenticationProvider(tokenCredential, isCaeEnabled: true, scopes: scopes);

// This example works with Microsoft.Graph 5+
// Use the GraphClientFactory to create an HttpClient with the proxy
var httpClient = GraphClientFactory.Create(proxy: new WebProxy(proxyAddress));
var graphClient = new GraphServiceClient(httpClient, authProvider);