Angularjs. $resource change encoding to ISO-8859-1, but server sent in utf-8

Question

i have a trouble) From angularjs i send data into my server using next service

    app.factory("SpeakerEditService", function ($resource) {
    return $resource('url',
        {
            speakerId: '@id',
            firstName: "@firstName",
            middleName: "@middleName",
            lastName: "@lastName",
            organisation: '@organisation'
        },
        {
            update: {
                method: 'POST',
                isArray:false,
                headers:{'Content-Type':'application/x-www-form-urlencoded; charset=UTF-8'}
            }
        }
    )
})

And my controller:

$scope.edit = function edit(row) {
        SpeakerEditService.update({}, row.entity)
    }

And in app.js configuration:

$httpProvider.defaults.headers.post['Content-Type'] =
        'application/x-www-form-urlencoded; charset=UTF-8';

but to server data comes like this^

And server works only with utf-8

What i'm doing wrong?