Collabora Online integration issues (WOPISrc missing + socket connection error behind reverse proxy)

Bắt đầu với đường dẫn tạo URL WOPI của Cloudreve và các cấu hình Caddy được hiển thị cho console.domain.ext và docs.domain.ext. Tái hiện việc mở một tài liệu bằng thiết lập Docker được cung cấp, sau đó theo dõi các yêu cầu WOPISrc và WebSocket. Hoàn tất khi có thể mở tài liệu thông qua reverse proxy mà không gặp lỗi thiếu WOPISrc hoặc lỗi kết nối socket.

Description:

Hello,

I'm trying to integrate Collabora Online (CODE) with Cloudreve (Docker, pro version) using WOPI, but I’m facing two blocking issues.

Setup:

Cloudreve running in Docker behind Caddy reverse proxy
Public domain: https://console.domain.ext/
Collabora Online running in Docker (collabora/code)
Collabora exposed via Caddy on https://docs.domain.ext
Storage: Cloudflare R2 (working correctly)

Cloudreve reverse proxy (Caddy):

console.domain.ext {
    reverse_proxy localhost:5212 {
        header_up Host {host}
        header_up X-Forwarded-Proto {scheme}
        header_up X-Forwarded-Host {host}
    }
}

Collabora setup:

docker run -d \
  --name collabora \
  -p 127.0.0.1:9980:9980 \
  -e "aliasgroup1=https://console.domain.ext" \
  -e "domain=console\\.domain\\.ext" \
  -e "extra_params=--o:ssl.enable=false --o:ssl.termination=true" \
  collabora/code

Issues:

WOPI error in Collabora

When opening a document:

Wrong or missing WOPISrc parameter

It seems Collabora is not receiving a valid WOPISrc URL from Cloudreve.

WebSocket / reverse proxy error

Collabora frontend shows:

Failed to establish socket connection or socket connection closed unexpectedly. The reverse proxy might be misconfigured.

Observations:

Cloudreve backend is working correctly (upload/download OK)
API /api/v4/file/content works fine
No database or storage errors
The issue only happens when opening documents in Collabora

Question:

Could you clarify:

• How Cloudreve generates the WOPISrc URL (is it based on SiteURL or request headers)?
• What is the recommended reverse proxy configuration for WOPI + Collabora behind Caddy/Nginx?
• Are there any required environment variables to force external base URL for WOPI?
• Any known issues with Docker + reverse proxy causing localhost WOPISrc generation?