Own CDN

Own CDN increases cookie lifetime in Safari 16.4 and other browsers using ITP set from “third-party” IP addresses. 

The most recent iteration of ITP reduces the lifetime of first-party cookies to 7 days if they are set through a different IP address than your website. 

By utilizing your Stape Own CDN, you can route the server GTM tagging URL via the same IP address your site uses. This ensures that the IPs for your sGTM URL and website are identical. As a result, WebKit will not shorten the duration of first-party cookies set via the server-side Google Tag Manager.

Stape Own CDN is available on all plans.

1. Go to your Stape container setting and select Own CDN.

2. Go to CloudFlare and configure CNAME record for the tagging server URL. Please make sure that Proxied is enabled. The setting should look like in the screenshot below.

3. Go to the Rules → Configuration Rules - create a new rule

• Specify any name you like for the rule
• Select ‘Custom filter expression’ 
  • Field: hostname
  • Operator: contains
  • Value: specify your sGTM subdomain. In our example is ‘gtm.stape.tools’

Scroll down on this page and find the ‘SSL’ feature. Activate it with ‘Full’ option.

4. Go to the Rules → Transform Rules → Modify Request Header - create a new rule

Specify any name you like for the rule

Select ‘Custom filter expression’

Field: hostname

Operator: contains

Value: specify your sGTM subdomain, in our example, it is ‘gtm.stape.tools’

In the modify headers section, specify:

Type: Set static

Header name: X-From-Cdn

Value: cf-stape

Deploy changes

5. Go to the Caching → Cache Rules - create a new rule

• Specify any name you like for the rule
• Select ‘Custom filter expression’ 
  • Field: hostname
  • Operator: contains
  • Value: specify your sGTM subdomain. In our example, it is ‘gtm.stape.tools’

Cache eligibility: Bypass cache

Deploy changes.

That's it, now all your requests to and from sGTM will be proxied through Cloudflare.

*If you are using a Web Application Firewall please make sure that it will not block these requests.

Useful links:

1. Safari ITP update limits cookies to 7 days for responses from 3rd party IPs.
2. How to increase first-party cookie lifetime set by a third-party IP (Safari 16.4 and ITP update).
3. Chrome disables third-party cookies for 1% of users in Q1 2024.