nswag cli - "Changing the URL is not supported because no valid IServerAddressesFeature was found"

[zyberzero]

Hello,

If I start my Aspnetcore app and use app.Run("http://*:5000") in my app, nswag aspnetcore2openapi crashes.

Minimum example to recreate the issue,
Program.cs

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddEndpointsApiExplorer();
builder.Services.AddOpenApiDocument();

var app = builder.Build();
app.UseOpenApi();
app.UseSwaggerUi();


app.MapGet("/testendpoint", () => { })
    .WithName("testendpoint");

app.Run("http://*:5000");

project.csproj:

<Project Sdk="Microsoft.NET.Sdk.Web">
    <PropertyGroup>
        <TargetFramework>net8.0</TargetFramework>
        <Nullable>enable</Nullable>
        <ImplicitUsings>enable</ImplicitUsings>
    </PropertyGroup>

    <ItemGroup>
      <PackageReference Include="NSwag.AspNetCore" Version="14.1.0" />
    </ItemGroup>
</Project>

If I then in my project working directory run this command: npx nswag aspnetcore2openapi /output:./test.swagger
it yells at me:

NSwag NPM CLI
NSwag command line tool for .NET Core Net80, toolchain v14.1.0.0 (NJsonSchema v11.0.2.0 (Newtonsoft.Json v13.0.0.0))
Visit http://NSwag.org for more information.
NSwag bin directory: /Users/zyber/.npm/_npx/58e08e1c8752b753/node_modules/nswag/bin/binaries/Net80
Executing dotnet exec --depsfile /Users/zyber/RiderProjects/NswagMinimumExample/NswagMinimumExample/bin/Debug/net8.0/NswagMinimumExample.deps.json --runtimeconfig /Users/zyber/RiderProjects/NswagMinimumExample/NswagMinimumExample/bin/Debug/net8.0/NswagMinimumExample.runtimeconfig.json /Users/zyber/.npm/_npx/58e08e1c8752b753/node_modules/nswag/bin/binaries/Net80/NSwag.AspNetCore.Launcher.dll /var/folders/lw/nll50n7s615bktfmrr9czhrh0000gn/T/tmpeL4gwa.tmp /var/folders/lw/nll50n7s615bktfmrr9czhrh0000gn/T/tmphOInUr.tmp NswagMinimumExample /Users/zyber/.npm/_npx/58e08e1c8752b753/node_modules/nswag/bin/binaries/Net80/
Launcher directory: /Users/zyber/.npm/_npx/58e08e1c8752b753/node_modules/nswag/bin/binaries/Net80
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
 ---> System.AggregateException: One or more errors occurred. (Changing the URL is not supported because no valid IServerAddressesFeature was found.)
 ---> System.InvalidOperationException: Changing the URL is not supported because no valid IServerAddressesFeature was found.
   at Microsoft.AspNetCore.Builder.WebApplication.Listen(String url)
   at Microsoft.AspNetCore.Builder.WebApplication.Run(String url)
   at Program.<Main>$(String[] args) in /Users/zyber/RiderProjects/NswagMinimumExample/NswagMinimumExample/Program.cs:line 16
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor)
   at System.Reflection.MethodBaseInvoker.InvokeDirectByRefWithFewArgs(Object obj, Span`1 copyOfArgs, BindingFlags invokeAttr)
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.Wait()
   at NSwag.Commands.ServiceProviderResolver.GetServiceProviderWithHostFactoryResolver(Assembly assembly) in /_/src/NSwag.Commands/HostApplication.cs:line 171
   at NSwag.Commands.ServiceProviderResolver.GetServiceProvider(Assembly assembly) in /_/src/NSwag.Commands/HostApplication.cs:line 70
   at NSwag.Commands.Generation.AspNetCore.AspNetCoreToOpenApiGeneratorCommandEntryPoint.Process(String commandContent, String outputFile, String applicationName) in /_/src/NSwag.Commands/Commands/Generation/AspNetCore/AspNetCoreToOpenApiGeneratorCommandEntryPoint.cs:line 27
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor)
   at System.Reflection.MethodBaseInvoker.InvokeDirectByRefWithFewArgs(Object obj, Span`1 copyOfArgs, BindingFlags invokeAttr)
   --- End of inner exception stack trace ---
   at System.Reflection.MethodBaseInvoker.InvokeDirectByRefWithFewArgs(Object obj, Span`1 copyOfArgs, BindingFlags invokeAttr)
   at System.Reflection.MethodBaseInvoker.InvokeWithFewArgs(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at NSwag.AspNetCore.Launcher.Program.Main(String[] args) in /_/src/NSwag.AspNetCore.Launcher/Program.cs:line 132


Done executing command. Exit Code: 1.
System.InvalidOperationException: Swagger generation failed with non-zero exit code '1'.
   at NSwag.Commands.Generation.AspNetCore.AspNetCoreToOpenApiCommand.RunAsync(CommandLineProcessor processor, IConsoleHost host) in /_/src/NSwag.Commands/Commands/Generation/AspNetCore/AspNetCoreToOpenApiCommand.cs:line 195
   at NConsole.CommandLineProcessor.ProcessSingleAsync(String[] args, Object input)
   at NConsole.CommandLineProcessor.ProcessAsync(String[] args, Object input)
   at NSwag.Commands.NSwagCommandProcessor.ProcessAsync(String[] args) in /_/src/NSwag.Commands/NSwagCommandProcessor.cs:line 65node:child_process:960
    throw err;
    ^

Error: Command failed: dotnet "/Users/zyber/.npm/_npx/58e08e1c8752b753/node_modules/nswag/bin/binaries/Net80/dotnet-nswag.dll" aspnetcore2openapi /output:./test.swagger
    at checkExecSyncError (node:child_process:885:11)
    at Object.execSync (node:child_process:957:15)
    at /Users/zyber/.npm/_npx/58e08e1c8752b753/node_modules/nswag/bin/nswag.js:62:27
    at ChildProcess.exithandler (node:child_process:411:7)
    at ChildProcess.emit (node:events:514:28)
    at maybeClose (node:internal/child_process:1091:16)
    at ChildProcess._handle.onexit (node:internal/child_process:302:5) {
  status: 255,
  signal: null,
  output: [ null, null, null ],
  pid: 34824,
  stdout: null,
  stderr: null
}

Node.js v18.17.1

nswag version:

% npx nswag version  
NSwag NPM CLI
NSwag command line tool for .NET Core Net80, toolchain v14.1.0.0 (NJsonSchema v11.0.2.0 (Newtonsoft.Json v13.0.0.0))
Visit http://NSwag.org for more information.
NSwag bin directory: /Users/zyber/.npm/_npx/58e08e1c8752b753/node_modules/nswag/bin/binaries/Net80

NSwag version: 14.1.0.0
NJsonSchema version: 11.0.2.0 (Newtonsoft.Json v13.0.0.0)

However, I can start the project and run it, access Swagger UI with the correct endpoint data.

If I move http://*:5000 from app.Run() into Services.Webhost.UseUrls() it works, but I'd like to avoid that - as I would use this in a "common" package amongst several services, and I'd like it to be a drop in replacement.

Is this the intended behavior? I've failed to find any documentation with regards to this.