Caddyfile

:80 {
    root * /srv

    # Serve static files; return a genuine 404 if the file doesn't exist
    # (do NOT fall back to index.html — Next.js static export has a real
    # HTML file for every route, and a fake 200 would pollute caches).
    file_server

    # Next.js static export writes /foo/index.html and /foo.html.
    # Try both variants so clean URLs work, but stop there.
    try_files {path} {path}.html {path}/index.html

    # Prevent 404 (and other error) responses from being cached by
    # browsers or intermediate proxies.
    handle_errors {
        header Cache-Control "no-store"
        respond "{err.status_code} {err.status_text}" {err.status_code}
    }

    # Cache immutable versioned OnlyOffice assets (1 year)
    @onlyoffice_versioned {
        path /v*-*/*
    }
    header @onlyoffice_versioned Cache-Control "public, max-age=31556952, immutable"

    # Brotli-encoded x2t wasm
    @x2t_wasm {
        path /x2t/x2t.wasm
    }
    header @x2t_wasm Content-Encoding br

    # Brotli-encoded x2t versioned bundles
    @x2t_suffix {
        path /x2t-*/*
    }
    header @x2t_suffix Content-Encoding br
    header @x2t_suffix Cache-Control "public, max-age=31556952, immutable"
}