VPN / Proxy

Note

This is just a general example. There are many proxy tools; this page uses Clash Verge as an example, and the idea is the same for others.

Why you might need a proxy

The API itself has no regional restrictions. But different regions and ISPs in mainland China apply different network restrictions. Some users can connect directly, while others need a proxy — this is normal.

• If your connection is unstable, enable a proxy first.
• If you already use a proxy but it still doesn't work, follow the steps below.

Key: route the cctq domain through the proxy node

The core is to make sure the cctq domain connects through your proxy node. Using Clash Verge as an example:

1. Turn off the system proxy and enable TUN mode

Under Settings → System Settings: turn off the system proxy and enable TUN mode (virtual NIC). TUN mode captures all traffic, including command-line tools (Claude Code / Codex).

TIP

Most users are good to go after this step. If it still doesn't work, read on.

2. Add a rule to route cctq through the proxy

On the Subscription page, right-click your subscription → Edit Rules.

Add a rule and save:

• Rule type: DOMAIN-KEYWORD
• Rule content: cctq
• Proxy policy: Auto (or any working node)

Node tips

Watch node backhaul latency

Some nodes have a backhaul (origin-fetch) latency of 30s or even 60s, which can drop the connection before a reply finishes. If this happens, try switching to another node.

When in doubt, flip it

Try the opposite

• Proxy on? Turn it off. Off? Turn it on.
• On WiFi? Switch to mobile data. On mobile data? Switch to WiFi.
• Using the system proxy? Switch to TUN. On TUN? Switch back to the system proxy.