Set launchurl for production environment in ASP.NET Core Web API

You can review this ASP.NET Core Environments

Add production profile to your launchsettings.json file.

In the launchSettings.json the launch URL is the page that is opened when the application starts. Is this the setting you are looking for? (In my opinion in a production environment this is not a relevant setting.)

If I am correct in the production environment the /swagger URL doesn't load when you open it in a browser. The reason for this could be an "if (env.IsDevelopment) {...}" or something similar in the Startup class which conditionally adds the swagger middleware.

The settings that are present within this file are going to be used when we run the .NET core application either from Visual Studio or by using .NET Core CLI.

The most important point that you need to keep in mind is this launchSettings.json file is only used within the local development machine. That means this file is not required when we publishing our asp.net core application to the production server.

If you have certain settings and you want your application to use such settings when you publish and deploy your asp.net core application to the production server, then you need to store such settings in the appsettings.json file. Generally, in the ASP.NET Core application, the configuration settings are going to be stored in the appsettings.json file.

You can read this nice article about this topic : Article