UriParserUnqualified

var parser = new ODataUriParser(
    extModel.Model,
    ServiceRoot,
    new Uri("http://demo/odata.svc/People(1)/Addr/TestNS.GetZip"));

var path = parser.ParsePath();

var parser2 = new ODataUriParser(
    extModel.Model,
    ServiceRoot,
    new Uri("http://demo/odata.svc/People(1)/addr/getzip"))
{
    Resolver = new UnqualifiedODataUriResolver { EnableCaseInsensitive = true }
};

// Identical to path
var path2 = parser2.ParsePath();