Odoo的骚操作——json请求，http跳转

碰到odoo的一个骚操作，为什么说它骚，因为我们知道，一般json请求的返回值是json，然后由前端js来处理跳转之类的动作。如果请求是http，那么跳转之类的动作由浏览器根据返回值处理。odoo这个地方骚劲在于，前端的请求是以json方式进来的，它没有返回json，而是返回了一串bytes字节，然后页面居然跳转了。

具体内部机制有待进一步探究，先把代码放这里，给以后的开发留一个思路。

# website_sale/controllers/main.py
@http.route(['/shop/payment/transaction/',
        '/shop/payment/transaction/<int:so_id>',
        '/shop/payment/transaction/<int:so_id>/<string:access_token>'], type='json', auth="public", website=True)
def payment_transaction(self, acquirer_id, save_token=False, so_id=None, access_token=None, token=None, **kwargs):
    """ Json method that creates a payment.transaction, used to create a
    transaction when the user clicks on 'pay now' button. After having
    created the transaction, the event continues and the user is redirected
    to the acquirer website.

    :param int acquirer_id: id of a payment.acquirer record. If not set the
                            user is redirected to the checkout page
    """
    tx_type = 'form'
    if save_token:
        tx_type = 'form_save'

    # In case the route is called directly from the JS (as done in Stripe payment method)
    if so_id and access_token:
        order = request.env['sale.order'].sudo().search([('id', '=', so_id), ('access_token', '=', access_token)])
    elif so_id:
        order = request.env['sale.order'].search([('id', '=', so_id)])
    else:
        order = request.website.sale_get_order()
    if not order or not order.order_line or acquirer_id is None:
        return False

    assert order.partner_id.id != request.website.partner_id.id

    # find or create transaction
    tx = request.website.sale_get_transaction() or request.env['payment.transaction'].sudo()
    acquirer = request.env['payment.acquirer'].browse(int(acquirer_id))
    payment_token = request.env['payment.token'].sudo().browse(int(token)) if token else None
    tx = tx._check_or_create_sale_tx(order, acquirer, payment_token=payment_token, tx_type=tx_type)
    request.session['sale_transaction_id'] = tx.id
    return tx.render_sale_button(order, '/shop/payment/validate')

tx.render_sale_button方法的返回值类似如下值：

<input type="hidden" name="data_set" data-remove-me="" data-action-url="/payment/transfer/feedback"/>
<input type="hidden" name="return_url" value="shop/confirmation"/>
<input type="hidden" name="reference" value="S01205"/>
<input type="hidden" name="amount" value="648"/>
<input type="hidden" name="currency" value="CNY"/>