Storing authentication cookie for REST Client

We make an authentication request and get back a token that is stored as a cookie.  I can copy that result manually and add `Cookie:` to get subsequent requests to return, but that requires a manual step each day.

Is there a way to have make the authenticate request and have it stored for other requests?  I think the Cookie could be populated from a file (Cookie: < tokenFile.txt), but I cannot think of a way for the cookie to overwrite the contents of tokenFile.txt on a call to the Authenticate endpoint.