gistfile1.txt

 on_request:
                - get_cached:
                    method: get # can be omitted, get is default
                    # Support cache-control refreshs;
                    # key_value bucket returns 404 when receiving no-cache header
                    headers:
                      cache-control: '{cache-control}'
                    uri: /{domain}/sys/key_value/postservice.png/{hash}
                - return_on_success!: '{$.get_cached}'
                - get_post:
                    # If png not found, load original post request
                    uri: /{domain}/sys/post_data/postservice/{hash}
                - new_png:
                    method: post
                    uri: http://some.post.service/png
                    body: '{$.get_post.body}'
                - save_new_png:
                    method: put
                    uri: /{domain}/sys/key_value/postservice.png
                    headers: '{$.new_png.headers}'
                    body: '{$.new_png.body}'
                - return!: '{$.new_png}'