ActionMethodSelectorAttribute causes swagger file not to show up with 2 end points same name

[zoinkydoink]

What I am trying to do is have one endpoint name/route with multiple parameters.
I have got the endpoints working but when viewing swagger file, I get the error

'Fetch error undefined ./v1/swagger.json'
Below is complete code that causes the issue.
If i remove one of the end points and just leave one (still with [PostFor], it works and swagger file/doc shows, as soon as I add the second, swagger file stops working.

VERSION:

5.0

STEPS TO REPRODUCE:

    public class PostForAttribute: ActionMethodSelectorAttribute
    {

        public Type Type { get; }

        public PostForAttribute(Type type)
        {
            Type = type;
        }

        public override bool IsValidForRequest(RouteContext routeContext, ActionDescriptor action)
        {
            routeContext.HttpContext.Request.EnableBuffering();
            var body = new StreamReader(routeContext.HttpContext.Request.Body).ReadToEndAsync().Result;
            try
            {
                JsonConvert.DeserializeObject(body, Type, new JsonSerializerSettings { MissingMemberHandling = MissingMemberHandling.Error });
                return true;
            }
            catch (Exception)
            {
                return false;
            }
            finally
            {
                routeContext.HttpContext.Request.Body.Position = 0;
            }
        }
    }
    public class TestController : ControllerBase
    {
        private readonly IMediator _mediator;

        public TestController(IMediator mediator)
        {
            _mediator = mediator;
        }


        [HttpPost("/send")]
        [PostFor(typeof(Class2))]

        public async Task<IActionResult> Class2Method(Class2 cmd)
        {
            var user = await _mediator.Send(cmd);
            return Ok(user);
        }

        [HttpPost("/send")]
        [PostFor(typeof(Class1))]

        public async Task<IActionResult> Class1Method(Class1 cmd)
        {
            var user = await _mediator.Send(cmd);
            return Ok(user);
        }

        public class Class1
        {
            public string ClassOne { get; set; }
        }
        public class Class2
        {
            public string ClassTwo { get; set; }
        }
    }

EXPECTED RESULT:

Multiple end points with same name and different parameters

ACTUAL RESULT:

Fetch error undefined ./v1/swagger.json

[icnocop]

Does the debug output indicate a more detailed error?

[abhiphirke]

ActionMethodSelectorAttribute

Swashbuckle.AspNetCore.SwaggerGen.SwaggerGeneratorException: Conflicting method/path combination "GET WeatherForecast/mypath/{id}" for actions - ActSel.Controllers.WeatherForecastController.Get1 (ActSel),ActSel.Controllers.WeatherForecastController.Get2 (ActSel). Actions require a unique method/path combination for Swagger/OpenAPI 3.0. Use ConflictingActionsResolver as a workaround at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GenerateOperations(IEnumerable1 apiDescriptions, SchemaRepository schemaRepository)
at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GeneratePaths(IEnumerable1 apiDescriptions, SchemaRepository schemaRepository) at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GetSwagger(String documentName, String host, String basePath) at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, ISwaggerProvider swaggerProvider) at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

[tituszban]

I ran into the same issue when trying to use feature flags to switch between endpoints.