Continue fails to stablish mTLS connection with server

[bijavix]

Before submitting your bug report

• [x] I've tried using the "Ask AI" feature on the Continue docs site to see if the docs have an answer
• [x] I believe this is a bug. I'll try to join the Continue Discord for questions
• [x] I'm not able to find an open issue that reports the same bug
• [x] I've seen the troubleshooting guide on the Continue Docs

Relevant environment info

- OS: Linux Debian or Windows 10
- Continue version: 1.3.22
- IDE version: VSCode 1.105.1
- config:
  
name: owui
schema: v1
models:
  - name: qwen-coder
    provider: openai
    model: qwen3-coder:latest
    apiBase: https://webui.example.com/api
    apiKey: sk-...
    requestOptions:
      caBundlePath: /home/user/ca.pem
      clientCertificate:
        cert: /home/user/cert.crt
        key: /home/user/key.key

Description

I have an Open WebUI server behind a reverse proxy for mutual TLS.

The connection works fine if mTLS is disabled, but with mTLS the extension refuses to stablish a connection. Browsers are able to stablish connection using the client certificate.

To reproduce

1. Add a connection to server with mTLS, use client certificate and key in PEM format.
2. Send message
3. Error Connection error.

Log output

workbench.desktop.main.js:132 [Extension Host] Error handling webview message: {
  "msg": {
    "messageId": "bd...06",
    "messageType": "llm/streamChat",
    "data": {
      "completionOptions": {
        "reasoning": false
      },
      "title": "qwen-coder",
      "messages": [
        {
          "role": "system",
          "content": "..."
        },
        {
          "role": "user",
          "content": "Hello world!"
        }
      ],
      "messageOptions": {
        "precompiled": true
      }
    }
  }
}

Error: Connection error.

[The-LittleTeapot]

+1

[JensRudolph]

+1