httpclientfactory-sockethandler.cs

public void ConfigureServices(IServiceCollection services)
{
    // Maintain a single instance of the SocketsHttpHandler for the lifetime of the application
    SocketsHttpHandler socketsHttpHandler = new SocketsHttpHandler();
    socketsHttpHandler.PooledConnectionLifetime = TimeSpan.FromMinutes(10); // Customize this value based on desired DNS refresh timer
    socketsHttpHandler.MaxConnectionsPerServer = 20; // Customize the maximum number of allowed connections
    services.AddSingleton<SocketsHttpHandler>(socketsHttpHandler);
    
    services.AddSingleton<CosmosClient>(serviceProvider =>
    {
        SocketsHttpHandler socketsHttpHandler = serviceProvider.GetRequiredService<SocketsHttpHandler>();
        CosmosClientOptions cosmosClientOptions = new CosmosClientOptions()
        {
            HttpClientFactory = () => new HttpClient(socketsHttpHandler, disposeHandler: false)
        };

        return new CosmosClient("<connection-string>", cosmosClientOptions);
    });
    
    services.AddSingleton<OtherService>(serviceProvider =>
    {
      SocketsHttpHandler socketsHttpHandler = serviceProvider.GetRequiredService<SocketsHttpHandler>();
      // another service that might also use HttpClient
      HttpClient anotherHttpClient = new HttpClient(socketsHttpHandler, disposeHandler: false);
      return new OtherService(anotherHttpClient);
    }
    //... other service registration
}