Default values of `client.request(options)`

Hi!

I'm using the action client.request(options) documented here https://developer.zendesk.com/api-reference/apps/apps-core-api/client_api/#clientrequestoptions.

My question:

What are the default values for some of the options listed? 
E.g. What is the default timeout value in case it's not explicitly set?

Thanks and best regards,

Alexander