How to get the response headers in dojo/store/JsonRest?

I’m using dojo/store/JsonRest to fetch for some data. But I also need the response headers. How can I access them?

this.transport = new JsonRest({
  target: "my/target"
});

this.transport.query({}).then(function(resp) {
  debugger; // <- I want to get the response headers here!
})

I tried accessing it by using the this keyword within the function at debugger time. But that is just the window object.

Is that even possible?

dojo/store/JsonRest by itself do not provide a way to get the headers, but here is an example of how you can get all or individual headers.

var transport = new JsonRest({
  target: "my/target"
});

var result = transport.query({});

result.then(function(resp) {
  var localXHR = result.ioArgs.xhr;

  // get all headers, return an String
  console.log(localXHR.getAllResponseHeaders());

  // get one header
  console.log(localXHR.getResponseHeader('content-type'));

  // do something with the response
  console.log(resp);
});

Hope it helps