async fn download_default_key_pair(
        &self,
    ) -> Result<DownloadDefaultKeyPairResult, RusotoError<DownloadDefaultKeyPairError>> {
        let mut request = self.new_signed_request("POST", "/");
        request.add_header("x-amz-target", "Lightsail_20161128.DownloadDefaultKeyPair");
        request.set_payload(Some(bytes::Bytes::from_static(b"{}")));

        let response = self
            .sign_and_dispatch(request, DownloadDefaultKeyPairError::from_response)
            .await?;
        let mut response = response;
        let response = response.buffer().await.map_err(RusotoError::HttpDispatch)?;
        proto::json::ResponsePayload::new(&response)
            .deserialize::<DownloadDefaultKeyPairResult, _>()
    }
<p>Downloads the default SSH key pair from the user's account.</p>
rusoto/services/lightsail/src/generated.rs