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fix: v1.9.12 — gate parallel_relay fan-out to idempotent methods only (#743)

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Reported in #743: with `parallel_relay > 1`, a single POST (e.g. submitting a comment) reached the destination as N concurrent requests, so the comment got posted twice. Root cause is unfixable from the Rust side: `select_ok` cancels only OUR futures, but Apps Script has no way to learn the cancellation, so every fan-out call still runs to completion and each `UrlFetchApp.fetch()` still hits the destination.

Fan-out now only triggers for idempotent methods (GET / HEAD / OPTIONS); POST / PUT / PATCH / DELETE always go sequential. Same pattern as `SAFE_REPLAY_METHODS` in Code.gs `_doBatch` fallback — safe methods are idempotent so re-firing is at worst wasteful, unsafe methods can have side effects so re-firing is incorrect.

New regression test locks down `is_method_safe_for_fanout` predicate. Tests: 180 lib + 35 tunnel-node green.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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therealaleph
2026-05-05 14:16:08 +03:00
parent c2a33a80c7
commit 9a21bc44cf
4 changed files with 72 additions and 3 deletions
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Cargo.toml
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@@ -1,6 +1,6 @@
[package]
name = "mhrv-rs"
version = "1.9.11"
version = "1.9.12"
edition = "2021"
description = "Rust port of MasterHttpRelayVPN -- DPI bypass via Google Apps Script relay with domain fronting"
license = "MIT"