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ASP.NET Core - Swashbuckle.AspNetCore.SwaggerGen.SwaggerGeneratorException: Ambiguous HTTP method for action

I’m currently rewriting an existing ASP.NET Web API application to ASP.NET Core.

I ported a controller from ASP.NET Web API to ASP.NET Core. Here is the end result:

Everything looked OK at first sight, but when I tried to run the application I got the following error message:

Swashbuckle.AspNetCore.SwaggerGen.SwaggerGeneratorException: Ambiguous HTTP method for action - Controllers.AuthTypeController.GetAll (VLM.IAM.Services). Actions require an explicit HttpMethod binding for Swagger/OpenAPI 3.0

   at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GenerateOperations(IEnumerable`1 apiDescriptions, SchemaRepository schemaRepository)

   at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GeneratePaths(IEnumerable`1 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.Server.IIS.Core.IISHttpContextOfT`1.ProcessRequestAsync()

The Swagger/OpenAPI middleware requires that you explicitly annotate all your action methods. So I had to update the GetAll action method and annotate it with a [HttpGet] attribute:

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