set_cookie
Description:
Adds cookie to this, exactly as though it had appeared in a Set-Cookie header returned from a
      request to uri.
Keep in mind that if the CookieJarAcceptPolicy set is either NO_THIRD_PARTY or GRANDFATHERED_THIRD_PARTY you'll need to use set_cookie_with_first_party, otherwise the jar will have no way of knowing if the cookie is being set by a third party or not.
Parameters:
| this | |
| uri | 
           the URI setting the cookie  | 
      
| cookie | 
           the stringified cookie to set  |