$.ajax({
        type : 'POST',
        url : API_URL,
        processData : false,
        contentType : false,
        data : {
                username : $('#login_username').val(),
                password : $('#login_password').val()
        },
        error : function(xhr, error_type, error){
                console.log('ERROR ('+error_type+'): '+error);
        },
        success : function(data, status, xhr){
                console.log('SUCCESS ('+status+'): <BEGIN RESPONSE>'+message+'<END RESPONSE>');
        }
});