Allow access to headers or cookies

[jefflavallee]

Is your feature request related to a problem? Please describe.

I would like to be able to provide my current location to my chat so that it can be added to the prompt and it cam use it with tools to provide me information about services in my vicinity.

Describe the solution you'd like
I can add my own JavaScript to set a header with the current location, but I would then need to have functionality within chainlit to consume it. This does not seem possible currently.

Describe alternatives you've considered
If there's a function available within chaiblit to pull the current location from the browsers that would be helpful.

Additional context
Add any other context or screenshots about the feature request here.