Unable to get request header in asp net core web API

Question

I am trying to create a custom filter in asp net core web api which is as below but unable to get header info.

internal class BasicAuthFilterAttribute : ActionFilterAttribute
{
  private StringValues xyz;

  public override void OnActionExecuting(ActionExecutingContext actionContext)
  {
    var authHeader = actionContext.HttpContext.Request.Headers.TryGetValue("Basic", out xyz);           
  }
}

TryGetValue always return false however I can see Headers contains the "Basic" header. As I am new in ASP.NET Core so can anyone guide me what I am possibly doing wrong?

Here how headers looks like.

Answer 1

Thank you all for your valuable input however below code worked as expected.

actionContext.HttpContext.Request.Headers.TryGetValue("Authorization", out authorizationToken);