HttpRequestMessage properties in Azure function - asp.net-core

Question

When my web request is run, some properties that are in the Properties property of HttpRequestMessage are from the System.Web namespace, although the application I am developing is .NET Core 2 Azure function.
I would like to use one object from the collection, MS_HttpContext which is of type System.Web.HttpContextWrapper. Is it possible to use this object and somehow cast to it? This object seems to be from standard .NET framework.
[FunctionName("Track")]
public static async Task<HttpResponseMessage> Run([HttpTrigger(AuthorizationLevel.Anonymous, "get", Route = "track")]HttpRequestMessage req, TraceWriter log, ExecutionContext context)
{
// HttpContextWrapper is from System.Web, so this does not work
var ctx = (HttpContextWrapper)req.Properties["MS_HttpContext"]
}
EDIT: my question is slightly different than my previos question (Get remote IP address in Azure function), because it asks how can classes from System.Web namespace be accessed from a .NET Core application. Although I admit the desired result is the same in both questions, to get the remote IP address.

Answer 1

Alright, not that I know much how this works, but reflection seems to work:
private static string GetRemoteIpAddress(HttpRequestMessage req)
{
if (req.Properties.ContainsKey("MS_HttpContext") == false)
{
return null;
}
var httpContext = req.Properties["MS_HttpContext"];
var pi = httpContext.GetType().GetProperty("Request");
var request = pi.GetValue(httpContext);
pi = request.GetType().GetProperty("UserHostAddress");
var address = pi.GetValue(request);
return address == null ? null : address.ToString();
}