sigcue
← Reported problems
Reported problemNot a verified signal

experimental.testProxy hangs raw TCP sockets (regression in 16.3.0, works in 16.2.12)

experimental.testProxy hangs raw TCP sockets (regression in 16.3.0, works in 16.2.12)

SourceGitHub
Communityvercel/next.js
DateAug 5, 2026
Independent reports1

Important limitations

  • This may be one public report, not widespread demand.
  • Current independent report count: 1.
  • This is currently a single independent report. It has not passed clustering or human review as a verified signal.
  • No market size, willingness to pay, competition, or trend claims are inferred here.

What was reported

Who is affected
Application developer using the reported software
Job to be done
Run tests reliably
Workflow
After upgrading 16.2.12 → 16.3.0, every Playwright test whose
Desired outcome
`testProxy` should only intercept `fetch()`/HTTP traffic (per its documented purpose for `next/experimental/testmode`), and should not affect unrelated raw `net.Socket` connections
Severity
Not enough evidence yet.
Urgency
Not enough evidence yet.

Evidence indicators

Evidence records1
Independent reports1
Reproduction notesPresent
Metrics mentionedPresent
Logs mentionedPresent
Corroborationuncorroborated

What would upgrade this

  • Additional independent reports from distinct communities or authors.
  • Human clustering into a review signal, then explicit publication approval.
  • Counter-evidence review and durable original-source verification.

Original source

Open the original public report