de>params</code></td><td><code><a href=https://developers.google.com/protocol-buffers/docs/reference/google.protobuf#struct>google.protobuf.Struct</a></code></td><td><p>Optional. Depends on adapter implementation. Struct representation of a
proto defined by the adapter implementation; this varies depending on the value of field <code>adapter</code>.</p></td></tr><tr id=Handler-connection><td><code>connection</code></td><td><code><a href=#Connection>Connection</a></code></td><td><p>Optional. Information on h