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To configure SpaProxyServerUrl in .NET Core 6 according to the environment, you can follow the below steps:

1. Open the appsettings.json file.

2. Add a new property "SpaProxyServerUrl" to the file under the "AllowedHosts" property.

3. Set the value of the "SpaProxyServerUrl" property to the URL of the target server.

4. Modify the Program.cs file and add the following code:

public static IHostBuilder CreateHostBuilder(string[] args) =>
    Host.CreateDefaultBuilder(args)
        .ConfigureWebHostDefaults(webBuilder =>
        {
            webBuilder.ConfigureAppConfiguration((hostingContext, config) =>
            {
                config.AddJsonFile($"appsettings.{hostingContext.HostingEnvironment.EnvironmentName}.json", optional: true, reloadOnChange: true);
            })
            .UseStartup<Startup>();
        });

1. Right-click on the project and select Properties from the context menu.

2. Click on the Debug tab and add a new environment variable called ASPNETCORE_ENVIRONMENT.

3. Set the value of the variable to the environment name you want to use (e.g. Development, Production).

4. Run the application and the environment-specific configuration should be loaded.

Note: The steps mentioned above assume that you are using ASP.NET Core 6 with the default configuration. If you have a custom setup, you may need to make adjustments to the process accordingly.