@timtilberg ooooh I now see the issue with `this` and multiple header/cookie sets.

Currently I have `#user_agent=` write it's value directly into `#headers`. However, this pattern doesn't exactly work neatly with cookies, if you override `#headers=` after setting `#cookie=`.

Mojo::UserAgent introductory notes https://github.polettix.it/ETOOBUSY/2021/02/22/mojo-useragent-intro-notes/ #mojolicious #perl #user_agent