使用.Net Core3.1，应用程序一启动"UriFormatException:无效URI:无法确定URI的格式“，就会出现错误

{
  "ConnectionStrings": {
    "DefaultConnection": "https://example.com/api"
  }
}

using System;

public class Program
{
    public static void Main(string[] args)
    {
        try
        {
            Uri uri = new Uri("https://example.com/api");
            Console.WriteLine("URI is valid: " + uri);
        }
        catch (UriFormatException ex)
        {
            Console.WriteLine("URIFormatException: " + ex.Message);
        }
    }
}

using Microsoft.Extensions.Configuration;
using System;

public class Program
{
    public static void Main(string[] args)
    {
        var configuration = new ConfigurationBuilder()
            .AddJsonFile("appsettings.json")
            .Build();

        var connectionString = configuration.GetConnectionString("DefaultConnection");

        try
        {
            Uri uri = new Uri(connectionString);
            Console.WriteLine("URI is valid: " + uri);
        }
        catch (UriFormatException ex)
        {
            Console.WriteLine("URIFormatException: " + ex.Message);
        }
    }
}

using Microsoft.Extensions.Configuration;
using System;
using System.Diagnostics;

public class Program
{
    public static void Main(string[] args)
    {
        var configuration = new ConfigurationBuilder()
            .AddJsonFile("appsettings.json")
            .Build();

        var connectionString = configuration.GetConnectionString("DefaultConnection");

        Debug.WriteLine("Attempting to parse URI: " + connectionString);

        try
        {
            Uri uri = new Uri(connectionString);
            Debug.WriteLine("URI is valid: " + uri);
        }
        catch (UriFormatException ex)
        {
            Debug.WriteLine("URIFormatException: " + ex.Message);
        }
    }
}