# ProtocolError

> The server returned an error response. The request succeeded in communicating with the server, but received an error as defined by the connection protocol.

## Definition

* **Type:** Field
* **Namespace:** [UnityEngine.Networking](/engine/6000.7/script-reference/unityengine/networking.md)
* **Assembly:** UnityEngine.UnityWebRequestModule

```csharp
ProtocolError = 3
```

### Remarks

For the HTTP protocol, response codes 4xx and 5xx mean errors.