<PackageReference Include="System.Security.Permissions" Version="11.0.0-preview.2.26159.112" />

System.Net.WebPermission

Controls rights to access HTTP Internet resources.
namespace System.Net { public sealed class WebPermission : CodeAccessPermission, IUnrestrictedPermission { public IEnumerator AcceptList { get; } public IEnumerator ConnectList { get; } public WebPermission(); public WebPermission(NetworkAccess access, string uriString); public WebPermission(NetworkAccess access, Regex uriRegex); public WebPermission(PermissionState state); public void AddPermission(NetworkAccess access, string uriString); public void AddPermission(NetworkAccess access, Regex uriRegex); public bool IsUnrestricted(); } }