[FEATURE]: Support for custom web app proxy URL in firewalled environments

[jobrk]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

Problem

When running opencode web, the server proxies the web UI from app.opencode.ai. This requires internet access, making OpenCode unusable in firewalled or air-gapped enterprise environments.

Use Case

Organizations with strict network policies need to:

1. Deploy the OpenCode web UI on an internal server
2. Have users run the local OpenCode server, pointing to the internally-hosted app

Proposed Solution

Add an environment variable OPENCODE_APP_URL to override the default proxy target.

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• [FEATURE]: opencode web shall not use external website app.opencode.ai #11981: [FEATURE]: opencode web shall not use external website app.opencode.ai - This is a closed feature request describing the exact same problem in restricted environments (like GCP Cloud workstations) that cannot access app.opencode.ai, and proposes bundling the frontend or allowing a custom path to FE files.

Feel free to ignore if none of these address your specific case.

[thdxr]

Fixed by #19299 - The WebUI is now embedded directly in the binary, so you no longer need to proxy to app.opencode.ai. The embedded UI can be served locally in firewalled/air-gapped environments.