# HttpKnownHeaderNames.Upgrade

Kind: Field  
Namespace: `Sisk.Core.Http`  
Assembly: `Sisk.Core.dll`  
Source: https://docs.sisk-framework.org/api/Sisk.Core.Http.HttpKnownHeaderNames.Upgrade.html

## Upgrade {#Sisk_Core_Http_HttpKnownHeaderNames_Upgrade}

The HTTP Upgrade header.

Indicates that the client prefers to upgrade to a different protocol, such as switching from HTTP/1.1 to HTTP/2.

```csharp
public const string Upgrade = "Upgrade"
```

### Field Value

[string](https://learn.microsoft.com/dotnet/api/system.string)