Error 1019 indicates that a Cloudflare compute resource — such as a Cloudflare Worker, Pages Function, or other edge compute service — experienced an internal server error. Unlike error 1101 (which indicates an unhandled exception in your Worker code), 1019 may indicate an issue with Cloudflare's compute infrastructure itself. However, it can also be triggered by Workers that generate invalid responses or hit platform-level limits.
A temporary issue with Cloudflare's Workers or Pages infrastructure is preventing compute resources from executing.
The Worker or Pages Function returns a response that Cloudflare's edge cannot process — such as an invalid status code, malformed headers, or an oversized response.
The compute resource hit platform limits beyond the subrequest limit — such as memory limits, script size limits, or startup time limits.
Visit cloudflarestatus.com to see if there is an ongoing incident affecting Workers or Pages.
Use wrangler tail to see real-time logs and identify if your code is causing the error.
wrangler tail --format pretty
Ensure your Worker returns a valid Response object with proper status code (100-599), valid headers, and a body that does not exceed size limits.
Run the Worker locally with wrangler dev to reproduce the issue outside of production.
wrangler dev
A Cloudflare Worker script running on this domain threw an unhandled JavaScript exception.
A Cloudflare Worker exceeded the maximum number of subrequests (fetch calls) allowed per invocation.
Cloudflare received an empty, unknown, or unexpected response from the origin server.