# Package org.apache.coyote.http11.upgrade

- Interface Summary
  Interface | Description
  --- | ---
  InternalHttpUpgradeHandler | This Tomcat specific interface is implemented by handlers that require direct access to Tomcat's I/O layer rather than going through the Servlet API.

- Class Summary
  Class | Description
  --- | ---
  UpgradeApplicationBufferHandler | Trivial implementation of `ApplicationBufferHandler` to support saving of HTTP request bodies during an HTTP/1.1 upgrade.
  UpgradeGroupInfo | This aggregates the data collected from each UpgradeInfo instance.
  UpgradeInfo | Structure to hold statistical information about connections that have been established using the HTTP/1.1 upgrade mechanism.
  UpgradeProcessorBase |
  UpgradeProcessorExternal |
  UpgradeProcessorInternal |
  UpgradeServletInputStream |
  UpgradeServletOutputStream |