3 replies

Errors in websocket worker tail

Workers

I just made my very first websocket worker and deployed it.
It works just fine, however when I tried to see the logs with tail I encountered some strange behavior: no logs show while the connection is active and when i disconnect all log entries show up with two identical errors stating:

Error: The Workers runtime canceled this request because it detected that your Worker's code had hung and would never generate a response. Refer to: https://developers.cloudflare.com/workers/observability/errors/

Error: The Workers runtime canceled this request because it detected that your Worker's code had hung and would never generate a response. Refer to: https://developers.cloudflare.com/workers/observability/errors/

the linked page stated that I need the following block to prevent this:

server.addEventListener("close", () => {
    server.close();
});

server.addEventListener("close", () => {
    server.close();
});

however after adding it the same issue remains.

Output:

GET https://api-dev.example.com/charger/ocpp?chargerId=1 - Exception Thrown @ 2025. 10. 15. 10:46:16
  (log) OCPP-[C(1)]: Connection attempt.
  (log) OCPP-[C(1)->S]: [2, "36799101", "BootNotification", {...}]
  (log) OCPP-[S->C(1)]: [3,"36799101",{"currentTime":"2025-10-15T08:46:22.779Z","interval":0,"status":"Accepted"}]
✘ [ERROR]   Error: The Workers runtime canceled this request because it detected that your Worker's code had hung and would never generate a response. Refer to: https://developers.cloudflare.com/workers/observability/errors/


✘ [ERROR]   Error: The Workers runtime canceled this request because it detected that your Worker's code had hung and would never generate a response. Refer to: https://developers.cloudflare.com/workers/observability/errors/

GET https://api-dev.example.com/charger/ocpp?chargerId=1 - Exception Thrown @ 2025. 10. 15. 10:46:16
  (log) OCPP-[C(1)]: Connection attempt.
  (log) OCPP-[C(1)->S]: [2, "36799101", "BootNotification", {...}]
  (log) OCPP-[S->C(1)]: [3,"36799101",{"currentTime":"2025-10-15T08:46:22.779Z","interval":0,"status":"Accepted"}]
✘ [ERROR]   Error: The Workers runtime canceled this request because it detected that your Worker's code had hung and would never generate a response. Refer to: https://developers.cloudflare.com/workers/observability/errors/


✘ [ERROR]   Error: The Workers runtime canceled this request because it detected that your Worker's code had hung and would never generate a response. Refer to: https://developers.cloudflare.com/workers/observability/errors/

Errors in websocket worker tail

Workers

Error: The Workers runtime canceled this request because it detected that your Worker's code had hung and would never generate a response. Refer to: https://developers.cloudflare.com/workers/observability/errors/

Error: The Workers runtime canceled this request because it detected that your Worker's code had hung and would never generate a response. Refer to: https://developers.cloudflare.com/workers/observability/errors/

the linked page stated that I need the following block to prevent this:

server.addEventListener("close", () => {
    server.close();
});

server.addEventListener("close", () => {
    server.close();
});

however after adding it the same issue remains.

Output:

GET https://api-dev.example.com/charger/ocpp?chargerId=1 - Exception Thrown @ 2025. 10. 15. 10:46:16
  (log) OCPP-[C(1)]: Connection attempt.
  (log) OCPP-[C(1)->S]: [2, "36799101", "BootNotification", {...}]
  (log) OCPP-[S->C(1)]: [3,"36799101",{"currentTime":"2025-10-15T08:46:22.779Z","interval":0,"status":"Accepted"}]
✘ [ERROR]   Error: The Workers runtime canceled this request because it detected that your Worker's code had hung and would never generate a response. Refer to: https://developers.cloudflare.com/workers/observability/errors/


✘ [ERROR]   Error: The Workers runtime canceled this request because it detected that your Worker's code had hung and would never generate a response. Refer to: https://developers.cloudflare.com/workers/observability/errors/

GET https://api-dev.example.com/charger/ocpp?chargerId=1 - Exception Thrown @ 2025. 10. 15. 10:46:16
  (log) OCPP-[C(1)]: Connection attempt.
  (log) OCPP-[C(1)->S]: [2, "36799101", "BootNotification", {...}]
  (log) OCPP-[S->C(1)]: [3,"36799101",{"currentTime":"2025-10-15T08:46:22.779Z","interval":0,"status":"Accepted"}]
✘ [ERROR]   Error: The Workers runtime canceled this request because it detected that your Worker's code had hung and would never generate a response. Refer to: https://developers.cloudflare.com/workers/observability/errors/


✘ [ERROR]   Error: The Workers runtime canceled this request because it detected that your Worker's code had hung and would never generate a response. Refer to: https://developers.cloudflare.com/workers/observability/errors/

Errors in websocket worker tail

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