IdentityServer4 IDX20803: Unable to obtain configuration from: 'System.String' – Docker

hi i trying to learn identity server 4 . i tried a simple project with api client id4 api-gateway …. but now i try the same project with docker container. my client app at the beginning must redirect to identity server login page but throw error

SocketException: Connection refused
System.Net.Sockets.Socket+AwaitableSocketAsyncEventArgs.ThrowException(SocketError error, CancellationToken cancellationToken)

HttpRequestException: Connection refused (identityserver4:9001)
System.Net.Http.HttpConnectionPool.ConnectToTcpHostAsync(string host, int port, HttpRequestMessage initialRequest, bool async, CancellationToken cancellationToken)

IOException: IDX20804: Unable to retrieve document from: 'http://identityserver4:9001/.well-known/openid-configuration'.
Microsoft.IdentityModel.Protocols.HttpDocumentRetriever.GetDocumentAsync(string address, CancellationToken cancel)

InvalidOperationException: IDX20803: Unable to obtain configuration from: 'http://identityserver4:9001/.well-known/openid-configuration'.
Microsoft.IdentityModel.Protocols.ConfigurationManager<T>.GetConfigurationAsync(CancellationToken cancel)

Identiti server client configuration in Config.cs

new Client
                {
                     ClientId = "razorClient",
                     ClientName = "RAZOR Client App",
                     AllowedGrantTypes= GrantTypes.Hybrid,
                     RequirePkce = false,
                     AllowRememberConsent = false,
                     RedirectUris = new List<string>()
                     {
                         "http://clientapp:5001/signin-oidc"
                     },
                     PostLogoutRedirectUris = new List<string>()
                     {
                         "http://clientapp:5001/signout-callback-oidc"
                     },
                     ClientSecrets = new List<Secret>
                     {
                        new Secret("secret".Sha256())
                     },
                     AllowedScopes = new List<string>()
                     {
                         IdentityServerConstants.StandardScopes.OpenId,
                         IdentityServerConstants.StandardScopes.Profile,
                         "MYAPI"

                     },
                     AllowAccessTokensViaBrowser = true
                     
                }

IdentityServer program.cs

using IdentityServer;

var builder = WebApplication.CreateBuilder(args);

Microsoft.IdentityModel.Logging.IdentityModelEventSource.ShowPII = true;

builder.Services.AddControllersWithViews();

builder.Services.AddIdentityServer()
    .AddInMemoryClients(Config.Clients)
    .AddInMemoryIdentityResources(Config.IdentityResources)
    //.AddInMemoryApiResources(Config.ApiResources)
    .AddInMemoryApiScopes(Config.ApiScopes)
    .AddTestUsers(Config.TestUsers)
    .AddDeveloperSigningCredential();


var app = builder.Build();

if (!app.Environment.IsDevelopment())
{


    app.UseHttpsRedirection();


}



app.UseStaticFiles();
app.UseRouting();


app.UseIdentityServer();
app.UseAuthorization();

app.UseEndpoints(endpoints =>
{
    endpoints.MapDefaultControllerRoute();
});

app.Run();

client app program.cs

using ClientApp.Data;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.AspNetCore.Authentication.OpenIdConnect;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.Web;
using Microsoft.AspNetCore.Mvc.Authorization;

var builder = WebApplication.CreateBuilder(args);

Microsoft.IdentityModel.Logging.IdentityModelEventSource.ShowPII = true;

// Add services to the container.
builder.Services.AddRazorPages();
builder.Services.AddServerSideBlazor();
builder.Services.AddSingleton<WeatherForecastService>(); 


builder.Services.AddAuthentication(options =>
{
    options.DefaultScheme = CookieAuthenticationDefaults.AuthenticationScheme;
    options.DefaultChallengeScheme = OpenIdConnectDefaults.AuthenticationScheme;
})
.AddCookie(CookieAuthenticationDefaults.AuthenticationScheme)
.AddOpenIdConnect(OpenIdConnectDefaults.AuthenticationScheme, options =>
{

    options.Authority = "http://identityserver4:9001";
    options.MetadataAddress = "http://identityserver4:9001/.well-known/openid-configuration";


    //options.Authority = "http://localhost:9001";
    //options.MetadataAddress = "http://localhost:9001/.well-known/openid-configuration";

    options.RequireHttpsMetadata = false;

    options.ClientId = "razorClient";
    options.ClientSecret = "secret";
    options.ResponseType = "code id_token";

    options.Scope.Add("openid");
    options.Scope.Add("profile");
    options.Scope.Add("MYAPI");

    options.SaveTokens = true;

    options.GetClaimsFromUserInfoEndpoint = true;

});


builder.Services.AddMvcCore(options =>
{
    var policy = new AuthorizationPolicyBuilder()
        .RequireAuthenticatedUser()
        .Build();
    options.Filters.Add(new AuthorizeFilter(policy));
});



var app = builder.Build();

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error");

    app.UseHttpsRedirection();
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
}

app.UseHttpsRedirection();

app.UseStaticFiles();

app.UseRouting();


app.UseAuthentication();
app.UseAuthorization();


app.MapBlazorHub();
app.MapFallbackToPage("/_Host");

app.Run();

docker-compose.override

version: '3.4'

services:

  identityserver4:
    container_name: identityserver4
    environment:
      - ASPNETCORE_ENVIRONMENT=Development
      
    ports:
      - "9001:80"


  clientapp:
    container_name: clientapp
    environment:
      - ASPNETCORE_ENVIRONMENT=Development
    ports:
      - "5001:80"
    depends_on:
      - identityserver4


  apiresource:
    container_name: apiresource
    environment:
      - ASPNETCORE_ENVIRONMENT=Development 
    ports:
      - "8001:80"

and this is the test project repo

EDIT: i edited the question based on simple project contains api and client and identityserver4