[Bug] Internal server error on /debug/registration-cache · juanfont/headscale#2714

2025-08-04T14:39:53.000Z

### Is this a support request? - [x] This is not a support request ### Is there an existing issue for this? - [x] I have searched the existing issues ### Current Behavior An internal server error is displayed when `/debug/registration-cache` is requested and there are pending registrations. ### Expected Behavior Display the current registration cache. ### Steps To Reproduce 1. Start a new, interactive registration. The client shows the usual setup instructions to complete the setup by registering the new node using the headscale CLI 2. Request the registration-cache of the debug interface ```console $ curl http://localhost:9090/debug/registration-cache internal server error ``` 3. Notice the corresponding log entry on the server: ``` ERR http internal server error error="json: unsupported type: chan *types.Node" code=500 ``` ### Environment ```markdown - OS: Debian 12 - Headscale version: 0.26.1 - Tailscale version: 1.84.2 ``` ### Runtime environment - [ ] Headscale is behind a (reverse) proxy - [ ] Headscale runs in a container ### Debug information Not required.

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Descrizione

Is this a support request?

This is not a support request

Is there an existing issue for this?

I have searched the existing issues

Current Behavior

An internal server error is displayed when /debug/registration-cache is requested and there are pending registrations.

Expected Behavior

Display the current registration cache.

Steps To Reproduce

Start a new, interactive registration. The client shows the usual setup instructions to complete the setup by registering the new node using the headscale CLI

Request the registration-cache of the debug interface

$ curl http://localhost:9090/debug/registration-cache
internal server error

Notice the corresponding log entry on the server:

ERR http internal server error error="json: unsupported type: chan *types.Node" code=500

Environment

- OS: Debian 12
- Headscale version: 0.26.1
- Tailscale version: 1.84.2

Runtime environment

Headscale is behind a (reverse) proxy
Headscale runs in a container

Debug information

Not required.

Guida contributor

Direzione di ricerca: L'errore si verifica nell'endpoint /debug/registration cache quando ci sono registrazioni in sospeso. Il log mostra "json: unsupported type: chan *types.Node", indicando che un canale viene convertito in JSON. Individua il gestore per questo endpoint nel codice sorgente (probabilmente in un file come debug.go o simile) e modifica la risposta per evitare di includere il canale. Invece, converti i dati del canale in un formato serializzabile (ad esempio, una slice) prima di restituirli.
Tech stack: go
Dominio: backend
Tipo issue: Bug
Difficoltà: 2
Tempo stimato: 1-3 ore
Stato attività: Attiva
Chiarezza: Chiara
Prerequisiti: GoGit
Adatta ai principianti: 75