feat(anvil): add --no-fork-node-info to skip fork identity probes - #16778
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andreyobruchkov wants to merge 1 commit into
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feat(anvil): add --no-fork-node-info to skip fork identity probes#16778andreyobruchkov wants to merge 1 commit into
andreyobruchkov wants to merge 1 commit into
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Some public RPCs retry unknown methods for tens of seconds instead of returning method-not-found. Skipping anvil_nodeInfo/anvil_metadata lets Anvil bind after the usual eth_* fork reads. Co-authored-by: Cursor <cursoragent@cursor.com>
andreyobruchkov
requested review from
0xrusowsky,
DaniPopes,
figtracer,
grandizzy,
mablr,
mattsse and
stevencartavia
as code owners
September 10, 2026 07:25
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✅ Changelog foundThe deterministic check will validate the changed entry. |
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Motivation
Anvil probes the fork URL with
anvil_nodeInfo(andanvil_metadataif that succeeds) before it binds the listen port. That is how nested Anvil is detected.Some public RPCs do not fail-fast on unknown methods. They retry/hedge at the gateway for ~18s, then return
-32601. For those endpoints, Anvil can take ~30s to listen even thougheth_chainId/eth_getBlockByNumberare fast.Callers that wait on localhost RPC (and then SIGINT) hit a start timeout even though the chain itself is healthy.
Solution
Add
--no-fork-node-info(requires--fork-url). When set, Anvil skipsanvil_nodeInfo/anvil_metadataand treats the endpoint as a regular chain:eth_chainId,eth_getBlockByNumber,eth_gasPricestill run.Example:
This PR was written with Cursor (Grok). I specified the flag and the skip-probe behavior; the implementation and tests were generated in that session.
PR Checklist
Made with Cursor