<PackageReference Include="NETStandard.Library" Version="2.0.3" />

System.Net.Http.Headers.ContentRangeHeaderValue

namespace System.Net.Http.Headers { public class ContentRangeHeaderValue : ICloneable { public long? From { get; } public bool HasLength { get; } public bool HasRange { get; } public long? Length { get; } public long? To { get; } public string Unit { get; set; } public ContentRangeHeaderValue(long length); public ContentRangeHeaderValue(long from, long to); public ContentRangeHeaderValue(long from, long to, long length); public static ContentRangeHeaderValue Parse(string input); public static bool TryParse(string input, out ContentRangeHeaderValue parsedValue); } }