parameters: (jar, request)
return_statement: return r.get_new_headers().get('Cookie')
docstring: Produce an appropriate Cookie header string to be sent with `request`, or None.
  
      :rtype: str
docstring_summary: Produce an appropriate Cookie header string to be sent with `request`, or None.
docstring_tokens: Produce an appropriate Cookie header string to be sent with request or None .
function: def get_cookie_header(jar, request):
      """
      Produce an appropriate Cookie header string to be sent with `request`, or None.
  
      :rtype: str
      """
      r = MockRequest(request)
      jar.add_cookie_header(r)
      return r.get_new_headers().get('Cookie')
function_tokens: def get_cookie_header ( jar , request ) : r = MockRequest ( request ) jar . add_cookie_header ( r ) return r . get_new_headers ( ) . get ( 'Cookie' )