public static async Task <HttpResponse> WriteMock(this HttpResponse response, MockModel mock) { response.AddHeaders(mock.Headers); response.StatusCode = mock.StatusCode; response.ContentType = $"{mock.ContentType}; charset={mock.Charset.ToLower()}"; string body = mock.ContentType switch { "application/json" => ((Func <string>)(() => { object bodyObject = JsonSerializer.Deserialize <object>(mock.Body); return(JsonSerializer.Serialize(bodyObject)); }))(), _ => mock.Body }; await response.WriteAsync(body); return(response); }