pakopress.dev — SDK fallback: onerror → DNS → jsDelivr

The snippet (minified)

Paste this one <script> block. It writes the primary <script> with the inlined onerror and carries the whole fallback chain. This is the exact code running on this page.

Fallback chain

• Primary — markup <script src="cdn.id5-sync.com/api/1.0/id5-api.js" onerror="…">. onerror on a parser-inserted script is the signal iOS 27 request blocking leaves intact.
• DNS (DoH) — on onerror, query id5-api-alt-cdn.eu-2-id5-sync.com TXT at three resolvers in parallel, first answer wins, base64-decode to the alternate CDN URL, load it.
• jsDelivr — if no TXT resolves (or the resolved script fails), load the hardcoded cdn.jsdelivr.net URL as last resort.
• ID5 init — whichever SDK loads, every ID5 ID fetch goes first-party to edge.pakopress.dev (CNAME edge.eu-2-id5-sync.com), so no request is keyed on id5-sync.com.

DNS record to publish

Add a TXT record on eu-2-id5-sync.com whose value is the base64 of the alternate SDK URL. Current value points at jsDelivr, SDK 1.0.99:

Requests made by this page

blue = DoH lookups (Cloudflare / Google / AliDNS) · amber = primary (cdn.id5-sync.com) · indigo = fallback SDK (jsDelivr) · green = first-party ID5 calls (edge.pakopress.dev)