<checkout-discount POST https://www.hm.com/gb/checkout/ordersummary/discountCode/add application/x-www-form-urlencoded
  <TextControl(value=)>
  <SubmitButtonControl(<None>=) (readonly)>>
1766
1766 143.86
<checkout-discount POST https://www.hm.com/gb/checkout/ordersummary/discountCode/add application/x-www-form-urlencoded
  <TextControl(value=)>
  <SubmitButtonControl(<None>=) (readonly)>>
1767
Traceback (most recent call last):
  File "/repo/scraper.py", line 48, in <module>
    response = br.submit()
  File "/usr/local/lib/python2.7/dist-packages/mechanize/_mechanize.py", line 541, in submit
    
return self.open(self.click(*args, **kwds))
  File "/usr/local/lib/python2.7/dist-packages/mechanize/_mechanize.py", line 203, in open
    
return self._mech_open(url, data, timeout=timeout)
  File "/usr/local/lib/python2.7/dist-packages/mechanize/_mechanize.py", line 255, in _mech_open
    
raise response
mechanize._response
.
httperror_seek_wrapper
: 
HTTP Error 500: Internal Server Error