Problematic call to HttpClient when trying to determine the media type

[darrelmiller]

OpenAPI.NET/src/Microsoft.OpenApi/Reader/OpenApiModelFactory.cs

Line 265 in df5d0c7

var response = _httpClient.GetAsync(url).GetAwaiter().GetResult();

This can't hide a potentially expensive HTTP request inside a method like this. We are going to have to find another way of accessing the media type.