All Known Implementing Classes:
AbstractStandardUpgradeStrategy, AbstractTyrusRequestUpgradeStrategy, GlassFishRequestUpgradeStrategy, JettyRequestUpgradeStrategy, TomcatRequestUpgradeStrategy, UndertowRequestUpgradeStrategy, WebLogicRequestUpgradeStrategy, WebSphereRequestUpgradeStrategy
```
public interface RequestUpgradeStrategy
```
A server-specific strategy for performing the actual upgrade to a WebSocket exchange.
Since:
4.0
Author:
Rossen Stoyanchev

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`List<WebSocketExtension>`	`getSupportedExtensions(ServerHttpRequest request)`	Return the WebSocket protocol extensions supported by the underlying WebSocket server.
`String[]`	`getSupportedVersions()`	Return the supported WebSocket protocol versions.
`void`	`upgrade(ServerHttpRequest request, ServerHttpResponse response, String selectedProtocol, List<WebSocketExtension> selectedExtensions, Principal user, WebSocketHandler wsHandler, Map<String,Object> attributes)`	Perform runtime specific steps to complete the upgrade.

- Method Detail
  - getSupportedVersions
```
String[] getSupportedVersions()
```
    Return the supported WebSocket protocol versions.
  - getSupportedExtensions
```
List<WebSocketExtension> getSupportedExtensions(ServerHttpRequest request)
```
    Return the WebSocket protocol extensions supported by the underlying WebSocket server.
  - upgrade
```
void upgrade(ServerHttpRequest request,
             ServerHttpResponse response,
             @Nullable
             String selectedProtocol,
             List<WebSocketExtension> selectedExtensions,
             @Nullable
             Principal user,
             WebSocketHandler wsHandler,
             Map<String,Object> attributes)
      throws HandshakeFailureException
```
    Perform runtime specific steps to complete the upgrade. Invoked after successful negotiation of the handshake request.
    Parameters:
    request - the current request
    response - the current response
    selectedProtocol - the selected sub-protocol, if any
    selectedExtensions - the selected WebSocket protocol extensions
    user - the user to associate with the WebSocket session
    wsHandler - the handler for WebSocket messages
    attributes - handshake request specific attributes to be set on the WebSocket session via HandshakeInterceptor and thus made available to the WebSocketHandler
    Throws:
    HandshakeFailureException - thrown when handshake processing failed to complete due to an internal, unrecoverable error, i.e. a server error as opposed to a failure to successfully negotiate the requirements of the handshake request.

Interface RequestUpgradeStrategy

Method Summary

Method Detail

getSupportedVersions

getSupportedExtensions

upgrade