anchor.diff:          docker_url:container_start(config:docker_api_url(), Id),
           [{<<"Content-Type">>, <<"application/json">>}],
           <<"">>,
  -        []
  +        [{pool, default}]
       ),
       ok.
   
  
positive.code:         Url,
          [{<<"Content-Type">>, <<"application/json">>}],
          <<"">>,
          []
      ),
      ok.
  
  
negative.code:         docker_url:container_create(config:docker_api_url()),
          [{<<"Content-Type">>, <<"application/json">>}],
          jsx:encode(Configuration),
          [{pool, default}]
      ),
      {ok, Data} = hackney:body(Client),
      proplists:get_value(<<"Id">>, jsx:decode(Data)).
  