How to fix an integration test error?

Question

ASP.NET

I am writing an integration test, but I get an error 500. Even if I change the URL to another one. I think I did the wrong setting. if I write the test in a different way, then the
setting reacts to a different URL.

public UnitTest1()
        {
            var server = new TestServer(new WebHostBuilder()
                .UseEnvironment("Development")
                .UseStartup<Startup>());
           
            _client = server.CreateClient();
        }

Test:

[Theory]
        [InlineData("Get")]
        public async Task Test1(string method)
        {
            _client.BaseAddress = new Uri("https://localhost:44320");
            //Arrange
            var request = new HttpRequestMessage(HttpMethod.Get, "/");
            //Act
            var response = await _client.SendAsync(request);
            //Assert
            response.EnsureSuccessStatusCode();// status code 500
            Assert.Equal(HttpStatusCode.OK,response.StatusCode);

        }

Test 2:

HttpWebRequest requestSecond = (HttpWebRequest)WebRequest.Create("https://localhost:44320"); 
            HttpWebResponse responseSecond = (HttpWebResponse)requestSecond.GetResponse(); 
              var statusCodeSecond = responseSecond.StatusCode; // код 200 если проект запущен

here is the screenshot:

Answer 1

Well the problem is 100% somewhere in the code.
500 code is an internal server error, which means that an exception is falling somewhere, you need to debug and read the logs.