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wai-quantum-serve 0.5.1: limits a request cannot pass, and a body is read whole or refused
A circuit the algorithm library builds is small (its builders clamp to 12
qubits), but a caller's own OpenQASM could name 26 qubits and any number
of gates, and a receipt any number of shots: one request could hold a
host's memory and CPU. Every such request is now refused before it is
simulated or sealed:

- a POST body over 256 KiB: 413. Before, the body was cut at 4 MiB and the
  cut text parsed as if it were the request;
- a circuit on more than 20 qubits, or of more than 2^27 amplitude
  updates (gates × 2^n): 422. Served as a component on an M4 Max core,
  2^30 took 15 s and 2^27 about 2 s;
- a measurement of more than 1,000,000 shots: 422;
- top above 1024 is read as 1024.

GET / states the limits. The module docs say a host should bound the
component too: time per request, memory per instance, instances at once.

Checked under wasmtime serve 49.0.1 with a 10 s timeout, a 256 MiB memory
limit and a pool of 8 memories: every endpoint, every refusal, a tampered
receipt refused, a circuit at the work limit run in 1.9 s, and of 14
concurrent requests at that limit 8 served and 6 refused at once by the
pool, the server unaffected after.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
2026-10-13 02:43:12 -04:00
..
src wai-quantum-serve 0.5.1: limits a request cannot pass, and a body is read whole or refused 2026-10-13 02:43:12 -04:00
build-proxy.sh wai-quantum-serve: a pure wasi:http/proxy build — no host flags 2026-09-04 06:28:08 -04:00
Cargo.lock wai-quantum-serve 0.5.1: limits a request cannot pass, and a body is read whole or refused 2026-10-13 02:43:12 -04:00
Cargo.toml wai-quantum-serve 0.5.1: limits a request cannot pass, and a body is read whole or refused 2026-10-13 02:43:12 -04:00