cookiesFromRequest
Parses @msg's Cookie request header and returns a struct@GLib.SList of SoupCookies.
As the "Cookie" header, unlike "Set-Cookie", only contains cookie names and values, none of the other #SoupCookie fields will be filled in. (Thus, you can't generally pass a cookie returned from this method directly to func@cookies_to_response.)
Return
a #GSList of SoupCookies, which can be freed with method@Cookie.free.
Parameters
msg
a #SoupMessage containing a "Cookie" request header