# Redirection

Netcode for GameObjects is built on the principle of server authorization, which has its advantages and disadvantages. When using RPCs, I can be confident that I received the RPC from a client if I am the server, or from the server if I am the client.

Messages also support this assurance by default. However, there are scenarios where you may need to bypass this, such as when creating a chat system that allows private messages between clients. This is easily achievable with Messages by adding a `true` parameter to the `[Message]` attribute.

## How does it work?

It works by redirecting the message to the server if it can't be sent directly (*for example, from client 1 to client 2*). The server then checks if this action is permitted. If it is, the server forwards the message to client 2, allowing client 2 to recognize that it was sent by client 1.

{% hint style="info" %} <mark style="color:red;">**IMPORTANT:**</mark> <mark style="color:red;"></mark><mark style="color:red;">This introduces some vulnerabilities! We can't assume that a message comes from the server when redirection is enabled, as it allows any client to send messages to any other client.</mark>
{% endhint %}

## Example

Let's use our good old ‘hello’ message again for this example as well!

```csharp
private void Start()
{
    // This is called on every client when they join!
    NetworkManager.Singleton.OnClientStarted += () =>
    {
        // Normally sending a message to everyone is only a thing for the server to do!
        // Let's say hello to everyone when we join!
        Messenger.ToAll(HelloMessage);
    };
}

[Message(allowRedirect:true)]
private void HelloMessage(ulong senderId)
{
    Debug.Log($"{senderId} says hello!");
}
```

If you want more examples please go to the [samples page](https://jrcooler.gitbook.io/easy-multiplayer/messenger/pages/rkbqiWiylu9nBB2GneVi#messengersamplegettingstarted.cs).


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