Blazor doesn't work in a Docker container

I have an ASP.NET Core 8.0 MVC (upgraded from .NET 6.0) project; it's working fine in a Docker container except for the pages that contain Blazor code. I'm getting an error

blazor.server.js:1 [2025-04-01T04:53:37.291Z] Error: System.Net.Http.HttpRequestException: Connection refused (localhost:32784)

After investigation, I found that HttpRequest in .razor page was causing the issue.

protected async override void OnInitialized(){    var request = new HttpRequestMessage(HttpMethod.Get, uri);    var response = await client.SendAsync(request);}

Program.cs:

builder.Services.AddServerSideBlazor().AddCircuitOptions(options => { options.DetailedErrors = true; });builder.Services.AddControllersWithViews();builder.Services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();builder.Services.AddDistributedMemoryCache();builder.Services.AddHttpClient();var app = builder.Build();if (app.Environment.IsDevelopment()){    app.UseDeveloperExceptionPage();    app.UseMigrationsEndPoint();}else{    app.UseExceptionHandler("/Home/Error");    app.UseHsts();}app.UseHttpsRedirection();app.UseStaticFiles();app.UseRouting();app.UseAuthentication();app.UseAuthorization();app.UseSession();app.MapControllerRoute(    name: "default",    pattern: "{controller=Home}/{action=Index}/{id?}");app.MapRazorPages();app.MapBlazorHub();

.csproj:

<PackageReference Include="HtmlAgilityPack" Version="1.11.43" /><PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.Server" Version="8.0.14" /><PackageReference Include="Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore" Version="8.0.14" /><PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="8.0.14" /><PackageReference Include="Microsoft.AspNetCore.Identity.UI" Version="8.0.14" /><PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="8.0.14" /><PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="8.0.14"><PrivateAssets>all</PrivateAssets><IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets></PackageReference><PackageReference Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.21.0" /><PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="8.0.7" /><PackageReference Include="Newtonsoft.Json" Version="13.0.3" /><PackageReference Include="System.Linq.Dynamic.Core" Version="1.2.19" />