Show how to configure the AWS SDK for .NET to be able to make service calls from a Blazor WASM application.

Blazor WASM and AWS .NET SDK

using Amazon;
using Amazon.Runtime;
using Amazon.CognitoIdentity;
using Amazon.Translate;

using BlazorAWSSample;
using Microsoft.AspNetCore.Components.Web;
using Microsoft.AspNetCore.Components.WebAssembly.Hosting;

// Configure the SDK to not modify user agent header since the browser controls that header.
AWSConfigs.UseAlternateUserAgentHeader = true;

var builder = WebAssemblyHostBuilder.CreateDefault(args);
builder.RootComponents.Add<App>("#app");
builder.RootComponents.Add<HeadOutlet>("head::after");

builder.Services.AddScoped(sp => new HttpClient { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) });

builder.Services.AddSingleton<AWSCredentials>(provider =>
{
    // Use the Cognito Identity credential provider from the AWSSDK.CognitoIdentity package.
    // Make sure the Identity Pool has an IAM role for unauthenticated roles with very strict access
    // to just the API calls you need.
    return new CognitoAWSCredentials("<identity-pool-id>", RegionEndpoint.USWest2);
});

builder.Services.AddSingleton<IAmazonTranslate>(provider =>
{
    var awsCredentiats = provider.GetService<AWSCredentials>();
    return new AmazonTranslateClient(awsCredentiats, RegionEndpoint.USWest2);
});

var host = builder.Build();

// Configure the AWS SDK to use the HTTP client that can be used from the browser 
// instead of the AWS .NET SDK attempting to create its own HTTP clients.
var httpClient = host.Services.GetRequiredService<HttpClient>();
AWSConfigs.HttpClientFactory = new HttpInjectorFactory(httpClient);

await host.RunAsync();

class HttpInjectorFactory : HttpClientFactory
{
    private readonly HttpClient InjectedClient;
    public HttpInjectorFactory(HttpClient injectedClient)
    {
        InjectedClient = injectedClient;
    }
    public override HttpClient CreateHttpClient(IClientConfig clientConfig)
      => InjectedClient;
    public override bool DisposeHttpClientsAfterUse(IClientConfig clientConfig)
      => false;
    public override bool UseSDKHttpClientCaching(IClientConfig clientConfig)
      => false;
}