opencode serve UI proxy for HTTPAPI: invalid chunked encoding on / and 401 on site.webmanifest when password is set

[OpeOginni]

Description

• Two issues affecting the served web UI when running opencode serve, both for the production proxy and a local preview proxy.
• Issue A: requests to / fail in the browser with net::ERR_INVALID_CHUNKED_ENCODING 200 (OK), so the page never loads.
• Issue B: with OPENCODE_SERVER_PASSWORD set, the browser fetch for /site.webmanifest and the PWA icons returns 401 Unauthorized, breaking manifest install/render.

Plugins

none

OpenCode version

Latest Dev as of 9f708e7

Steps to reproduce

1. Run opencode serve (on the latest dev commit), optionally with OPENCODE_SERVER_PASSWORD.
2. Open the served page through serve (e.g. http://127.0.0.1:4099/).
3. Issue A: console shows net::ERR_INVALID_CHUNKED_ENCODING 200 (OK) for /.
4. Issue B: Network tab shows GET /site.webmanifest returning 401 Unauthorized.

Screenshot and/or share link

No response

Operating System

macOS

Terminal

ghostty

[github-actions]

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

• prompt_async endpoint returns 524 timeout behind Cloudflare due to unnecessary stream() wrapper #16180: Describes the same root cause — the prompt_async endpoint uses an unnecessary stream() wrapper that creates empty chunked transfer-encoding responses, which matches the net::ERR_INVALID_CHUNKED_ENCODING symptom reported in Issue A here.