Configuring Kestrel Server Options in .NET 6 Startup.

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Aryan Kumar · Answer

Configuring Kestrel server options in .NET 6 can be done in the Startup.cs file of your ASP.NET Core application. Kestrel is the web server that ASP.NET Core applications use to handle incoming HTTP requests. You can customize various settings and options to meet your application's requirements. Here's how you can configure Kestrel server options:
Add the Required Namespace: Make sure you add the necessary 
using directive at the top of your Startup.cs file to access the Kestrel server-related classes:
using Microsoft.AspNetCore.Server.Kestrel.Core;
Configure Kestrel Options: In the ConfigureServices method of your
Startup.cs file, you can configure Kestrel options by accessing the
KestrelServerOptions class. Here's an example of configuring Kestrel to listen on a specific port and IP address:
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.AspNetCore.Server.Kestrel.Core;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Hosting;
public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        // ...
        services.Configureandlt;KestrelServerOptions>(options =>
        {
            options.ListenAnyIP(5000); // Listen on all available network interfaces, port 5000
        });
        // ...
    }
    public void Configure(IApplicationBuilder app)
    {
        // ...
        app.UseRouting();
        // ...
        app.UseEndpoints(endpoints =>
        {
            endpoints.MapControllers();
        });
    }
    public static void Main(string[] args)
    {
        CreateHostBuilder(args).Build().Run();
    }
In this example, we configure Kestrel to listen on all available network interfaces (any IP address) on port 5000. You can adjust the configuration to specify your desired IP address, port, or other Kestrel server settings as needed.
Additional Kestrel Configuration: You can configure other Kestrel options such as HTTPS, maximum connections, or request limits by modifying the
KestrelServerOptions instance. For example, to configure HTTPS:
services.Configureandlt;KestrelServerOptions>(options =>
{
    options.ListenAnyIP(5000); // HTTP
    options.ListenAnyIP(5001, listenOptions =>
    {
        listenOptions.UseHttps("path/to/your/certificate.pfx", "your-certificate-password");
    }); // HTTPS
});
Handling HTTPS with Development Certificate: During development, you can use the built-in development certificate, and the configuration would look like this:
services.Configureandlt;KestrelServerOptions>(options =>
{
    options.ListenAnyIP(5000); // HTTP
    options.ListenAnyIP(5001, listenOptions =>
    {
        listenOptions.UseHttps(); // Use the development certificate
    }); // HTTPS
});
By configuring Kestrel server options in your Startup.cs file, you can tailor the web server to meet the specific needs of your ASP.NET Core application, including settings like the IP address, port, and security configurations. Adjust the options according to your application's requirements and environment.

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Configuring Kestrel Server Options in .NET 6 Startup.

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