OPTIONS preflight not forwarded

“The HTTP reverse proxy used by shopify app dev intercepts OPTIONS requests and never forwards them to the target application.”

Is this your bug? What gets counted gets fixed. Pile on.

Paste this into your agent. It files your report, with your error and version.

I hit this bug: rapsheet.dev/sheets/shopify/issues/4701/file
Follow it to file my report. Show me the text before you send.

No install. No account. Public and anonymous. The link asks your agent for one report, nothing else. What it sends

Quiet. No reports in the last two weeks, down from 1 a week at the mid-April 2025 peak.

OPTIONS preflight not forwarded to app during app dev. CORS preflight from UI extensions gets no CORS headers through the tunnel, so the browser blocks fetch calls to the app backend.

Is this your bug?

File my report

Where: shopify app dev
Versions: 1.0.0
Platforms: macOS
How bad: Breaks a normal workflow. Some reports say it blocks them completely.

Not quite your bug?

Cloudflare tunnels break app dev3 people

Original reports3, newest first

Jul 10, 2026Fetch to proxy fail app dev modeOn the forum#35959
Apr 16, 2026HTTP reverse proxy swallows OPTIONS requests — breaks CORS preflight for extensionsOn GitHubcli #7324
Apr 16, 2025shopify app dev with cloudflare quick tunnel not proxying OPTIONS requestsOn GitHubcli #5660

OPTIONS preflight not forwarded

Is this your bug? What gets counted gets fixed. Pile on.

Is this your bug?

Not quite your bug?

Original reports3, newest first

Do you work on Shopify?