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#9356 internal error in local dev fetch to https URLs

Recommendation:KEEP OPEN
Difficulty:hard
Reasoning:

Confirmed regression; root cause in workerd; reproduction available

Suggested Action:

Needs workerd investigation

View on GitHub →

Analysis Report

Issue Review: cloudflare/workers-sdk#9356

Summary

Local dev fetch() to https URLs returns "internal error" while http URLs work fine.

Findings

  • Created: 2025-05-23
  • Updated: 2026-01-05
  • Version: wrangler latest / 4.14.3 → wrangler 4.61.0
  • Component: wrangler (dev), workerd
  • Labels: bug
  • Comments: 4

Key Evidence

  • Reproduction repo provided: https://github.com/irvinebroque/broken
  • Issue is that HTTPS subrequests fail in local dev with "internal error; reference = ..."
  • HTTP requests work fine
  • Maintainer @petebacondarwin identified the error originates from workerd, not wrangler middleware
  • Issue was not present in Wrangler v3.10.0
  • Recent activity (Jan 2026) shows users still asking for workarounds

Recommendation

Status: KEEP OPEN

Reasoning: This is a confirmed regression affecting local development. The issue has a reproduction repo, and the root cause has been identified as a workerd issue. Users continue to report this problem.

Action: This needs investigation in workerd. The issue should remain open until a fix is implemented.

Suggested Comment

N/A - Issue is being tracked.

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