An extension method to ASP.NET Core's HttpRequest class, delivering the original request target

HttpRequestExtensions.cs

using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Http.Features;

/// <summary>
/// Gets the raw target of an HTTP request.
/// </summary>
/// <returns>Raw target of an HTTP request</returns>
/// <remarks>
/// ASP.NET Core manipulates the HTTP request parameters exposed to pipeline
/// components via the HttpRequest class. This extension method delivers an untainted
/// request target. https://tools.ietf.org/html/rfc7230#section-5.3
/// </remarks>
public static string GetRawTarget(this HttpRequest request)
{
    var httpRequestFeature = request.HttpContext.Features.Get<IHttpRequestFeature>();
    return httpRequestFeature.RawTarget;
}