# Package org.apache.coyote.http11.upgrade.servlet31

- Interface Summary
  Interface | Description
  --- | ---
  HttpUpgradeHandler | Interface between the HTTP upgrade process and the new protocol.
  ReadListener | Receives notification of read events when using non-blocking IO.
  WebConnection | The interface used by a `HttpUpgradeHandler` to interact with an upgraded HTTP connection.
  WriteListener | Receives notification of write events when using non-blocking IO.

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