xhr with gopherjs

Go side:

func main() {
	js.Global.Set("HasGopherJS", true)
	js.Global.Set("http", map[string]interface{}{
		"GetFileTree": GetFileTree,
	})
}

func GetFileTree(dirRef string) {
	println("IN GETFILETREE")
	_, ok := blob.Parse(dirRef)
	if !ok {
		println(fmt.Sprintf("%q not a valid blobRef", dirRef))
		return
	}
	println("BLOB PARSING OK")

	resp, err := http.Get("http://localhost:3179/ui/tree/"+dirRef)
	if err != nil {
		println(fmt.Sprintf("error fetching file tree for directory %v: %v", dirRef, err))
		return
	}
	println("GET OK")
	defer resp.Body.Close()
	data, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		println(fmt.Sprintf("error reading file tree for directory %v: %v", dirRef, err))
		return
	}
	println("READ OK")
	println(data)
}

js side:

		if (HasGopherJS) {
			http.GetFileTree(this.props.meta.blobRef);
			return
		}
		
		
output:

xhrio.js:557 XHR finished loading: POST "http://localhost:3179/my-search/camli/search/query".
2016-03-17 17:53:52.292 gopherjs.js:82450 IN GETFILETREE
2016-03-17 17:53:52.294 gopherjs.js:82461 BLOB PARSING OK
2016-03-17 17:53:52.305
gopherjs.js:1420 Uncaught null
$callDeferred	@	gopherjs.js:1420
$panic	@	gopherjs.js:1443
$throwRuntimeError	@	gopherjs.js:2364
$block	@	gopherjs.js:1541
$recv	@	gopherjs.js:1594
$packages.honnef.co/go/js/xhr.Request.ptr.Send	@	gopherjs.js:82345
$packages.honnef.co/go/js/xhr.Send	@	gopherjs.js:82362
$packages.camlistore.org/server/camlistored/ui/gopherjs.GetFileTree	@	gopherjs.js:82462
v.$externalizeWrapper	@	gopherjs.js:1865
cam.DirectoryDetail.React.createClass.componentWillMount	@	directory_detail.js:53
(anonymous function)	@	react-with-addons.js:5944