How to get host name in startup file

Question

My API is running on IIS with "www.api-example.com". How can I get "api-example" in startup file ConfigureServices method?

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    public void ConfigureServices(IServiceCollection services)
    {
        //string hostName = ...

        //*** App Settings Services
        services.AddAppServices(Configuration);

        //*** Business Services
        services.AddBusinessServicesCollection();
         
    }
}

score 1 · Accepted Answer · answered Jan 05 '23 at 09:22

1

My API is running on IIS with "www.api-example.com". How can I get "api-example" in startup file ConfigureServices method?

No we cannot, because ConfigureServices invocked before constructing Startup so if we try to inject, it will through exception, even if we declare at global variable in that scenario it will always be null. Application startup happens only once, and long before any request has been received.

Proper Way to Get Main Host/Domain Name:

          app.Use((context, next) =>
            {
               var hostUrl = context.Request.Host.Host;
                Console.WriteLine(hostUrl);
                return next.Invoke();
            });

Output:

answered Jan 05 '23 at 09:22

Md Farid Uddin Kiron

16,817
3
17
43

I want to run this middleware just first request. Because I need this in just first request. Is it possible? – fatih Jun 12 '23 at 13:13
How would trace if the request is first or not? Need to do additional hassle. – Md Farid Uddin Kiron Jun 12 '23 at 14:23
Do you think this method will affect the performance of the program? – fatih Jun 12 '23 at 15:36
It won't because it will just act as an other middleware does. For instance, Authentication middleware, CORS middleware and so on. So there shouldn't be any critical performance issue. – Md Farid Uddin Kiron Jun 13 '23 at 01:24

score 0 · Answer 2 · answered Jan 05 '23 at 06:33

0

app.Use((context,next) =>
 {
    var url = context.Request.GetDisplayUrl();
    return next.Invoke();
 });

host name link

answered Jan 05 '23 at 06:33

Albin C S

340
1
5

I can use this in Configure method. Is there any way to get this url in ConfigureServices? – fatih Jan 05 '23 at 06:42

How to get host name in startup file

2 Answers2