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    I tried to use the uploader in my ASP.NET razor page application but I was not able to upload any file using the uploader as your documentation page is now obsolete. the JsonOption now does not contain a definition for  


The solution is to just write - 

services.AddAntiforgery(o => o.HeaderName = "XSRF-TOKEN");

Can you explain to me what the below code is doing and is it okay if I don't add this - 

    services.AddMvc().AddJsonOptions(x =>  
        x.SerializerSettings.ContractResolver = new DefaultContractResolver();  

Please kindly update the docs.