Don't retrieve AppTickets as they aren't needed anymore

DepotDownloader/CDNClientPool.cs

@@ -129,7 +129,7 @@ namespace DepotDownloader
                     {
                         steamSession.RequestCDNAuthToken(appId, depotId, server.Host);
 
-                        var cdnKey = string.Format("{0:D}:{1}", depotId, server.Host);
+                        var cdnKey = string.Format("{0:D}:{1}", depotId, steamSession.ResolveCDNTopLevelHost(server.Host));
                         SteamApps.CDNAuthTokenCallback authTokenCallback;
 
                         if (steamSession.CDNAuthTokens.TryGetValue(cdnKey, out authTokenCallback))
@@ -175,7 +175,7 @@ namespace DepotDownloader
                 {
                     steamSession.RequestCDNAuthToken(appId, depotId, server.Host);
 
-                    var cdnKey = string.Format("{0:D}:{1}", depotId, server.Host);
+                    var cdnKey = string.Format("{0:D}:{1}", depotId, steamSession.ResolveCDNTopLevelHost(server.Host));
                     SteamApps.CDNAuthTokenCallback authTokenCallback;
 
                     if (steamSession.CDNAuthTokens.TryGetValue(cdnKey, out authTokenCallback))

DepotDownloader/ContentDownloader.cs

@@ -481,8 +481,8 @@ namespace DepotDownloader
                 return null;
             }
 
-            if ( steam3 != null )
+            // Skip requesting an app ticket
-                steam3.RequestAppTicket( ( uint )depotId );
+            steam3.AppTickets[ depotId ] = null;
 
             ulong manifestID = GetSteam3DepotManifest( depotId, appId, branch );
             if ( manifestID == INVALID_MANIFEST_ID && branch != "public" )

DepotDownloader/Steam3Session.cs

@@ -313,8 +313,20 @@ namespace DepotDownloader
             }, () => { return completed; } );
         }
 
+        public string ResolveCDNTopLevelHost(string host)
+        {
+            // SteamPipe CDN shares tokens with all hosts
+            if (host.EndsWith( ".steampipe.steamcontent.com" ) )
+            {
+                return "steampipe.steamcontent.com";
+            }
+
+            return host;
+        }
+
         public void RequestCDNAuthToken( uint appid, uint depotid, string host )
         {
+            host = ResolveCDNTopLevelHost( host );
             var cdnKey = string.Format( "{0:D}:{1}", depotid, host );
 
             if ( CDNAuthTokens.ContainsKey( cdnKey ) || bAborted )