How to pass headers in Server Data Source API call?

I need to send User Auth token to server to fetch user related data and set permissions. I tried to follow this discussion [https://github.com/akveo/ng2-smart-table/issues/614](https://github.com/akveo/ng2-smart-table/issues/614) but it's giving error that:

> Type 'Headers' is not assignable to type 'import("c:/xampp/htdocs/utahrunning/utahclient/node_modules/@angular/http/src/headers").Headers'.
Property 'keys' is missing in type 'Headers'.

I cannot understand what this error really mean. I also posted this question on StackOverFlow but they all are referring to follow above mentioned ticket. Please help and guide what I'm missing. Thanks!