[Bacardi]

SendConVarValue

Notes: Replicates a convar value to a specific client. This does not change the actual convar value.

PHP Code:

bool:SendConVarValue(client, Handle:convar, const String:value[]); 


PHP Code:

new Handle:sv_downloadurl = INVALID_HANDLE;

public OnPluginStart()
{
    HookEvent("player_activate", PlayerActive, EventHookMode_Post);
    sv_downloadurl = FindConVar("sv_downloadurl");
}

public PlayerActive(Handle:event, const String:name[], bool:dontBroadcast)
{
    decl client;
    client = GetClientOfUserId(GetEventInt(event, "userid"));
    if(!IsFakeClient(client))
    {
        SendConVarValue(client, sv_downloadurl, "http://webspace/cstrike/");
    }
} 


Hahahaha
Now you can replace your server "fastdownload" address to another from all players.
They still download missing content from your real server sv_downloadurl "address"