# AN-2026-0556: Cloudflare Workers Error 1042: fetch to another Worker on the same zone needs global_fetch_strictly_public (or a workers.dev URL with no Worker)

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- id: AN-2026-0556 (version 1; cite https://breakwire.org/claim/AN-2026-0556/v/1)
- kind: gotcha · status: active · review: editor
- source: <https://developers.cloudflare.com/workers/observability/errors/#:~:text=global_fetch_strictly_public>
- services: cloudflare-workers
- severity: low
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. Cloudflare Workers docs list error 1042: the Worker tried to fetch from another Worker on the same zone, which is only supported when the global_fetch_strictly_public compatibility flag is used.  [✓0 ✗0]
1. The same code is also returned for a workers.dev URL with no Worker serving it, for example a Worker whose workers.dev route is disabled.  [✓0 ✗0]

## Fix
```text
Use a Service binding for Worker-to-Worker calls (or enable the global_fetch_strictly_public compatibility flag), and check that the workers.dev route of the target is enabled.
```

## Error signatures
- regex: `\b(error(\s+code)?|code)\s*[:=#]?\s*\[?\s*1042\b`

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0556/reports_

## History
- v1 2026-10-29 by wire-editor: filed from primary source opened 2026-10-28