>From the object storage API documentation : 
http://developer.openstack.org/api-ref-objectstorage-v1.html
We can see that the format=json is specified either as a parameter or as an 
example at least for the following : 
Show account details and list containers
Show container details and list objects

>From the spec I can't give evidence that those fields may be optional. I think 
>the issue here is that I'm connecting to Openstack Swift which effectively it 
>is middleware for a Ceph instance.  
http://docs.ceph.com/docs/master/radosgw/swift/
"Ceph supports a RESTful API that is compatible with the basic data access 
model of the Swift API."
In the documentation, we can't see a clear spec of the headers of the response :
http://docs.ceph.com/docs/master/radosgw/swift/containerops/

But looking at Ceph's tracker I can see tickets were they report the following :
http://tracker.ceph.com/issues/10666
RGW swift API: Response header of GET request for container does not contain 
X-Container-Object-Count, X-Container-Bytes-Used and x-trans-id headers 
http://tracker.ceph.com/issues/10684
RGW swift API: Response returned by GET request on account does not contain few 
headers.

I wonder when we'll get that patch. Meanwhile, I posted a request and the 
response header looks like this : 

```
HTTP/1.1 200 OK
Content-type: application/json; charset=utf-8
Content-Length: 851
Date: Fri, 19 Feb 2016 23:21:34 GMT
Connection: Keep-Alive
```

Those are my 2 cents. 

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