How to pass header with graphql request in webix jet ?

I want to pass jwt token in every graphql request. graphql works with proxy so how to pass header in that ?

Please help… @Dzmitry @annazankevich @intregal @Listopad

check this
https://docs.webix.com/desktop__server_customload.html#modifyingbackgroundajaxrequests

Done… Thank you @intregal.