How to read response headers

[munder]

My web service handles naff data by returning http response headers with appropriate codes. In Touch I have a store with a json proxy and in the controller a [store].load function with a callback with the following parameters: records, operation, success (as per the Sencha example). When a response header with an error code is received, 'success' is false. Fine, but what additional parameter can I add to the callback to be able to determine just which http header code was received?

[munder]

I finally found it in operation.error['status']