Server & Client RPCs

An RPC (Remote Procedure Call) lets one machine trigger a method that runs on another. Netcode gives you two directions.

public class PlayerShooter : NetworkBehaviour
{
    [ServerRpc]
    void FireServerRpc()
    {
        // Runs on the server only, the server owns the truth.
        SpawnBullet();
        FireClientRpc();
    }

    [ClientRpc]
    void FireClientRpc()
    {
        // Runs on every client, e.g. to play a muzzle-flash effect.
        PlayMuzzleFlash();
    }

    void Update()
    {
        if (IsOwner && Input.GetButtonDown("Fire1"))
            FireServerRpc();
    }
}

The rules

• [ServerRpc] methods are called by a client (usually the owner) but always execute on the server, name them with a ServerRpc suffix.
• [ClientRpc] methods are called by the server and execute on every connected client, suffix ClientRpc.
• By default a ServerRpc can only be called by the object's owner, set RequireOwnership = false to allow any client to call it.
• Never trust a client to decide game outcomes, a client calls a ServerRpc to request an action, the server validates and applies it, then tells everyone via a ClientRpc.