How does one allow for cookies to be maintained across multiple reqeusts

[3commascapital]

Some public infrastructure will use cookies in order to temporarily pin user requests to a single node for a short duration (<5mins). This can respect user security if the provider does not use any identifying data to do this and generally improve user experience by allowing them to interact with a single node at least for a short while. However, it seems that the fetch function does not have the ability to maintain cookies by default. How do people work around this?

1. Perhaps I am wrong and fetch started maintaining cookies - in which case, great
2. If cookies are not supported by fetch by default (in nodejs) then how do people go about supporting it currently?
3. Would it be reasonable to add this as a transport config (provide a wrapped fetch function as an option) or have a whole new transport?