Serve on custom port / remote server broken

[gempir]

Description

I've tried this on 3 different computers now. The frontend doesn't work for me anymore. I don't understand how this broke, because I used to have it working. But even reverting to older versions doesn't work.

The frontend seems to be "hardcoded" to send requests to
http://localhost:4096/global/health
http://localhost:4096/global/event

Which fail when the serve is either remote or a custom port is used.

OpenCode version

1.0.193

Steps to reproduce

1. opencode serve -p 8075
2. open http://127.0.0.1:8075

Screenshot and/or share link

Operating System

macOS 26.2

Terminal

Alacritty

[github-actions]

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

• opencode --port=8080 fails because port statically bound to 4096 #5928: opencode --port=8080 fails because port statically bound to 4096 (similar issue with hardcoded port 4096 in frontend)
• Bug: Web terminal fails when accessing via network IP instead of localhost #5844: Bug: Web terminal fails when accessing via network IP instead of localhost (related issue with frontend URL construction)

Both issues describe the same root cause where the frontend hardcodes requests to localhost:4096 instead of using the actual server address. Feel free to ignore if your specific case differs.

[gempir]

My bad this seems to be #5928

[gempir]

I'll reopen this because this issue isn't fixed on the latest version 1.0.196 and the other issue is closed.
I think the fix PR got reverted

[gempir]

Still broken on, even after #6181

easy reproducer on current version:

bunx opencode-ai@1.0.204 serve --port 3123

[mosajjal]

can confirm this is broken for me too

[Kiricon]

Still broken for me as well.