Deploy an ASP.NET Core-Web-API (.NET 5, Visual Studio 2019) to IIS

Question

Dear all,

I'm trying desperately to deploy an ASP.NET Core-Web-API (.NET 5) to IIS. I use Visual Studio 2019.

To test server setup (ASP.NET Core Hosting Bundle 5.0.15) I created an ASP.NET Core-Web-App and deployed it via file system, it works.

Then I created an ASP.NET Core-Web-API, the project template ("WeatherForecast") directly works locally in IIS Express (swagger page appears). A direct deploy to IIS without changes leads to HTTP 404.

Then I had a long web search and tried many possibilities, see below, without success. It can't be impossible to deploy an ASP.NET Core-Web-API to IIS, can you help me? Thank you very much!

This is what I tried:

public class Program
{
    public static void Main(string[] args)
    {
        var host = new WebHostBuilder()
            .UseKestrel()  // I tried also UseIIS instead of
            .UseContentRoot(Directory.GetCurrentDirectory())
            .UseIISIntegration()
            .UseStartup<Startup>()
            .Build();

        host.Run();
    }
}


public static void Main(string[] args)
{
    var host = new HostBuilder()
        .UseContentRoot(Directory.GetCurrentDirectory())
        .ConfigureWebHost(webBuilder =>
        {
            webBuilder.UseKestrel(serverOptions =>
            {
            })
            .UseIISIntegration()
            .UseStartup<Startup>();
        })
        .Build();

    host.Run();
}


public static IHostBuilder CreateHostBuilder(string[] args) =>
    Host.CreateDefaultBuilder(args)
        .ConfigureWebHostDefaults(webBuilder =>
        {
            webBuilder.UseKestrel();  // I tried also UseIIS instead of
            webBuilder.UseContentRoot(Directory.GetCurrentDirectory());
            webBuilder.UseIISIntegration();
            webBuilder.UseStartup<Startup>();
        });


public static IHostBuilder CreateHostBuilder(string[] args) =>
    Host.CreateDefaultBuilder(args)
        .ConfigureWebHostDefaults(webBuilder =>
        {
            webBuilder.ConfigureKestrel(serverOptions =>
            {
            })
            .UseStartup<Startup>();
        });

Answer 1

Hi @Matthias Schuppe

You can follow below article for publishing asp.net core 5 Web API into IIS.

https://learn.microsoft.com/en-us/aspnet/core/tutorials/publish-to-iis?view=aspnetcore-5.0&tabs=visual-studio

Would you please share how have you configure swagger?

Please check if your swagger in production or dev environment.

if (env.IsDevelopment()) // it run only in dev not in IIS  
            {  
                app.UseDeveloperExceptionPage();  
                //app.UseSwagger();  
                //app.UseSwaggerUI(c => c.SwaggerEndpoint("/swagger/v1/swagger.json", "TodoApi v1"));  
            }  


  

Answer 2

Hello @satya karki

Thank you very much, you brought me to the solution. Sometimes I checked only the default page and I expected swagger here. Now it's okay.