async fn get_flow_template_revisions(
        &self,
        input: GetFlowTemplateRevisionsRequest,
    ) -> Result<GetFlowTemplateRevisionsResponse, RusotoError<GetFlowTemplateRevisionsError>> {
        let mut request = self.new_signed_request("POST", "/");
        request.add_header(
            "x-amz-target",
            "IotThingsGraphFrontEndService.GetFlowTemplateRevisions",
        );
        let encoded = serde_json::to_string(&input).unwrap();
        request.set_payload(Some(encoded));

        let response = self
            .sign_and_dispatch(request, GetFlowTemplateRevisionsError::from_response)
            .await?;
        let mut response = response;
        let response = response.buffer().await.map_err(RusotoError::HttpDispatch)?;
        proto::json::ResponsePayload::new(&response)
            .deserialize::<GetFlowTemplateRevisionsResponse, _>()
    }
<p>Gets revisions of the specified workflow. Only the last 100 revisions are stored. If the workflow has been deprecated, this action will return revisions that occurred before the deprecation. This action won't work for workflows that have been deleted.</p>
rusoto/services/iotthingsgraph/src/generated.rs