async fn describe_reserved_cache_nodes_offerings(
        &self,
        input: DescribeReservedCacheNodesOfferingsMessage,
    ) -> Result<
        ReservedCacheNodesOfferingMessage,
        RusotoError<DescribeReservedCacheNodesOfferingsError>,
    > {
        let mut request = SignedRequest::new("POST", "elasticache", &self.region, "/");
        let params = self.new_params("DescribeReservedCacheNodesOfferings");
        let mut params = params;
        DescribeReservedCacheNodesOfferingsMessageSerializer::serialize(&mut params, "", &input);
        request.set_payload(Some(serde_urlencoded::to_string(&params).unwrap()));
        request.set_content_type("application/x-www-form-urlencoded".to_owned());

        let response = self
            .sign_and_dispatch(
                request,
                DescribeReservedCacheNodesOfferingsError::from_response,
            )
            .await?;

        let mut response = response;
        let result = xml_util::parse_response(&mut response, |actual_tag_name, stack| {
            xml_util::start_element(actual_tag_name, stack)?;
            let result = ReservedCacheNodesOfferingMessageDeserializer::deserialize(
                "DescribeReservedCacheNodesOfferingsResult",
                stack,
            )?;
            skip_tree(stack);
            xml_util::end_element(actual_tag_name, stack)?;
            Ok(result)
        })
        .await?;

        drop(response); // parse non-payload
        Ok(result)
    }
<p>Lists available reserved cache node offerings.</p>
rusoto/services/elasticache/src/generated.rs