link not returned in the headers

According to the documentation the next page URL is contained in the link header.

This is my URL:  https://xxxxxxxx.freshdesk.com/api/v2/tickets?per_page=30

I have 193 tickets in my test system.  I'm using the following to display the headers:

console.log(jqXHR.getAllResponseHeaders());

And the output is:

x-ratelimit-total: 1000

x-freshdesk-api-version: latest=v2; requested=v2

x-ratelimit-used-currentrequest: 1

x-ratelimit-remaining: 806

x-request-id: 8021a9f95eb773789c26c8331f71da97

pragma: no-cache

content-type: application/json; charset=utf-8

cache-control: must-revalidate, no-cache, no-store, private, max-age=0

expires: Wed, 13 Oct 2010 00:00:00 UTC

Where is the link reference?

Thanks.