WebSocket upgrade succeeds then server closes with 1008 Policy (falls back to HTTPS)

[kali113]

Codex WebSocket fallback report (sanitized)

Summary

Codex websocket transport to wss://chatgpt.com/backend-api/codex/responses upgrades successfully and is then immediately closed by server policy (1008), leading to reconnect loop and fallback to HTTPS.

Environment

• OS: Arch Linux (x86_64), kernel 6.18.9-arch1-2
• Codex CLI: 0.106.0 (also reproduced on 0.107.0-alpha.5)
• Node: v25.7.0
• npm: 11.10.1
• Auth: ChatGPT login mode
• Features enabled:
  • responses_websockets_v2 = true
  • realtime_conversation = true
  • voice_transcription = true

Repro

codex exec -C /home/arch --skip-git-repo-check --json "Reply with exactly: WS_FINAL_CHECK"

Expected

Websocket transport should remain open and stream should proceed without fallback.

Actual

• Reconnecting retries (2/5..5/5)
• Fallback message:
  • Falling back from WebSockets to HTTPS transport. stream disconnected before completion...

Key sanitized evidence

INFO  connecting to websocket: wss://chatgpt.com/backend-api/codex/responses
INFO  successfully connected to websocket: wss://chatgpt.com/backend-api/codex/responses
DEBUG Received close frame: Some(CloseFrame { code: Policy, reason: Utf8Bytes(b"") })
... reconnect loop ...
Falling back from WebSockets to HTTPS transport ...

What was ruled out

• Reproduces on stable + alpha codex CLI.
• Reproduces on responses_websockets_v2 and legacy responses_websockets.
• No HTTP_PROXY/HTTPS_PROXY env vars configured.

Attachments (sanitized)

• Evidence is posted inline in issue comments (no local-file dependency).

[github-actions]

Potential duplicates detected. Please review them and close your issue if it is a duplicate.

• WebSocket transport closes immediately with code 1008 (Policy) then falls back to HTTPS #13039

Powered by Codex Action

[kali113]

Maintainer note: local paths like /tmp/... in the issue body are not externally accessible. Posting sanitized evidence inline below.

Sanitized websocket policy-close trace

2026-02-27T18:27:54.791212Z  INFO codex_api::endpoint::responses_websocket: connecting to websocket: wss://chatgpt.com/backend-api/codex/responses
2026-02-27T18:27:55.174925Z  INFO codex_api::endpoint::responses_websocket: successfully connected to websocket: wss://chatgpt.com/backend-api/codex/responses
2026-02-27T18:27:55.176795Z DEBUG tungstenite::protocol: Received close frame: Some(CloseFrame { code: Policy, reason: Utf8Bytes(b"") })
2026-02-27T18:27:55.182285Z  INFO codex_api::endpoint::responses_websocket: connecting to websocket: wss://chatgpt.com/backend-api/codex/responses
2026-02-27T18:27:55.606312Z  INFO codex_api::endpoint::responses_websocket: successfully connected to websocket: wss://chatgpt.com/backend-api/codex/responses
2026-02-27T18:27:55.611381Z DEBUG tungstenite::protocol: Received close frame: Some(CloseFrame { code: Policy, reason: Utf8Bytes(b"") })
2026-02-27T18:27:55.822204Z  INFO codex_api::endpoint::responses_websocket: connecting to websocket: wss://chatgpt.com/backend-api/codex/responses
2026-02-27T18:27:56.332352Z  INFO codex_api::endpoint::responses_websocket: successfully connected to websocket: wss://chatgpt.com/backend-api/codex/responses
2026-02-27T18:27:56.339828Z DEBUG tungstenite::protocol: Received close frame: Some(CloseFrame { code: Policy, reason: Utf8Bytes(b"") })
Reconnecting... 2/5 (stream disconnected before completion: websocket closed by server before response.completed)
2026-02-27T18:27:56.725861Z  INFO codex_api::endpoint::responses_websocket: connecting to websocket: wss://chatgpt.com/backend-api/codex/responses
2026-02-27T18:27:57.021299Z  INFO codex_api::endpoint::responses_websocket: successfully connected to websocket: wss://chatgpt.com/backend-api/codex/responses
2026-02-27T18:27:57.021518Z DEBUG tungstenite::protocol: Received close frame: Some(CloseFrame { code: Policy, reason: Utf8Bytes(b"") })
Reconnecting... 3/5 (stream disconnected before completion: failed to send websocket request: Connection closed normally)
2026-02-27T18:27:57.760883Z  INFO codex_api::endpoint::responses_websocket: connecting to websocket: wss://chatgpt.com/backend-api/codex/responses
2026-02-27T18:27:58.126456Z  INFO codex_api::endpoint::responses_websocket: successfully connected to websocket: wss://chatgpt.com/backend-api/codex/responses
2026-02-27T18:27:58.126738Z DEBUG tungstenite::protocol: Received close frame: Some(CloseFrame { code: Policy, reason: Utf8Bytes(b"") })
Reconnecting... 4/5 (stream disconnected before completion: failed to send websocket request: Connection closed normally)
2026-02-27T18:27:59.871851Z  INFO codex_api::endpoint::responses_websocket: connecting to websocket: wss://chatgpt.com/backend-api/codex/responses
2026-02-27T18:28:00.243959Z  INFO codex_api::endpoint::responses_websocket: successfully connected to websocket: wss://chatgpt.com/backend-api/codex/responses
2026-02-27T18:28:00.244204Z DEBUG tungstenite::protocol: Received close frame: Some(CloseFrame { code: Policy, reason: Utf8Bytes(b"") })
Reconnecting... 5/5 (stream disconnected before completion: failed to send websocket request: Connection closed normally)
2026-02-27T18:28:03.562616Z  INFO codex_api::endpoint::responses_websocket: connecting to websocket: wss://chatgpt.com/backend-api/codex/responses
2026-02-27T18:28:03.930484Z  INFO codex_api::endpoint::responses_websocket: successfully connected to websocket: wss://chatgpt.com/backend-api/codex/responses
2026-02-27T18:28:03.930770Z DEBUG tungstenite::protocol: Received close frame: Some(CloseFrame { code: Policy, reason: Utf8Bytes(b"") })
{"type":"item.completed","item":{"id":"item_1","type":"error","message":"Falling back from WebSockets to HTTPS transport. stream disconnected before completion: failed to send websocket request: Connection closed normally"}}

Sanitized codex exec --json output

{"type":"thread.started","thread_id":"019ca058-ef8b-7a40-9cad-64885362c9f9"}
{"type":"item.completed","item":{"id":"item_0","type":"error","message":"Under-development features enabled: realtime_conversation, responses_websockets_v2, voice_transcription. Under-development features are incomplete and may behave unpredictably. To suppress this warning, set `suppress_unstable_features_warning = true` in /home/arch/.codex/config.toml."}}
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 2/5 (stream disconnected before completion: failed to send websocket request: Connection closed normally)"}
{"type":"error","message":"Reconnecting... 3/5 (stream disconnected before completion: failed to send websocket request: Connection closed normally)"}
{"type":"error","message":"Reconnecting... 4/5 (stream disconnected before completion: failed to send websocket request: Connection closed normally)"}
{"type":"error","message":"Reconnecting... 5/5 (stream disconnected before completion: failed to send websocket request: Connection closed normally)"}
{"type":"item.completed","item":{"id":"item_1","type":"error","message":"Falling back from WebSockets to HTTPS transport. stream disconnected before completion: failed to send websocket request: Connection closed normally"}}
{"type":"item.completed","item":{"id":"item_2","type":"reasoning","text":"**Preparing final output**"}}
{"type":"item.completed","item":{"id":"item_3","type":"agent_message","text":"WS_FINAL_CHECK"}}
{"type":"turn.completed","usage":{"input_tokens":9350,"cached_input_tokens":8320,"output_tokens":49}}

[kali113]

@pakrym-oai Follow-up with corrected formatting from my previous comment:

Repro is outside corporate environment (no corporate proxy/VPN), and proxy env vars are unset.

Observed behavior remains: websocket upgrade succeeds, then server immediately closes with 1008 Policy, and client falls back to HTTPS after retries.

If useful, I can run any additional diagnostics you want on this machine/account.

[bruno-ortiz]

Just to add to the report: I can confirm this is also happening on macOS Tahoe.
I’m using the ChatGPT login flow. However, when I switch to API key authentication, the problem does not happen.

[etraut-openai]

@bruno-ortiz, if you're able to reliably repro the failure, can you use /feedback to upload your logs and a sample session, then post the thread ID here? Thanks!

[bruno-ortiz]

Hey @etraut-openai, here is the thread ID. 019ca10b-6a31-7bd0-9c2e-1a9d7f309f79. Let me know if I can help in any other way.

[etraut-openai]

Thanks, I see the failure in your logs. Are you using a VPN or corporate network proxy?

[jordyvandomselaar]

Another thread ID: 019ca197-45c7-7700-a15c-ae5d694daefe

Not on a VPN or a proxy =)

[VisionaryOS]

same: Falling back from WebSockets to HTTPS transport. stream disconnected before completion: websocket closed by server before response.completed

[bruno-ortiz]

@etraut-openai no vpn or proxy.

[killianMei]

same: codex app 26.227.1448 (747)