url-cookie-multiple-line

url-cookie-multiple-line is a variable defined in `url-cookie.el'.
Its value is

nil

Documentation:
If nil, HTTP requests put all cookies for the server on one line.
Some web servers, such as http://www.hotmail.com/, only accept cookies
when they are on one line. This is broken behavior, but just try
telling Microsoft that.

You can customize this variable.