This repository is a minimal reproduction of the bug at:
Starting:
% docker compose up
Rerunning tests:
% docker compose restart tests
After the minimal Wrangler worker and fake origin server have started, the
tests container will run. It issues two requests, both will incorrectly
return 25 bytes instead of ~10MB. The first request does not trigger a memory
error in the worker, but each request after will.
You will notice 25 bytes returned by curl, the fileserver exception
about the connection being severed, and wrangler will show errors about
memory limits and errors from HTMLWriter, even though there is no HTMLWriter
invoked at all in the worker.
The error from Wrangler is:
workerd/server/server.c++:3422: error: Uncaught exception: workerd/api/html-rewriter.c++:99: failed: remote.jsg.TypeError: Parser error: The memory limit has been exceeded.
Wrangler workers seem to inspect inner URLs on img elements with data:
URLs. Because the data URL is 10MB inline, this causes a memory limit error on
the worker.