[hannessolo]

Summary

Addresses the server-side issues tracked by adobe/da-live#1688:

• Route MP4 GET and HEAD requests directly to AEM, preserving byte ranges, partial-content responses, media headers, and site-token authentication. Use an actual upstream HEAD for videos rather than downloading their bodies ([ew] Route AEM MP4 requests through DA Universal with Range support da-live#1694).
• Trim surrounding whitespace/NBSP from metadata paragraph/list values ([ew] Trim paragraph and list metadata values in DA Universal da-live#1689).
• Apply bulk metadata defaults before document overrides, preserving AEM's distinction between empty fixed metadata and empty custom metadata, and handling explicit empty bulk values ([ew] Apply page-local metadata after bulk defaults in DA Universal da-live#1690).
• Add row/cell scaffolding for empty named blocks and remove empty direct cell paragraphs without discarding meaningful elements ([ew] Match AEM row and cell scaffolding for empty named blocks da-live#1692; related [ew] Normalize empty block cells in prose2aem for viewport inheritance da-live#1691).
• Derive legacy/v2 section-metadata behavior from the existing site-config lookup, honoring explicit rendering versions before the creation-date fallback. Forward the decision to both normal and Quick Edit initial responses. Preserve legacy blocks; for v2, extract structured text, links, images, and style classes with correct token/paragraph boundaries and URL resolution ([ew] Honor AEM rendering mode when handling section metadata da-live#1695).

Related drafts

• da-live serialization: fix: normalize block and section metadata serialization da-live#1725
• da-nx standalone Quick Edit rendering mode: fix(quick-edit): honor site rendering mode in standalone previews da-nx#992

These are coordinated cross-repository changes, not stacked branches.

Validation

• npm test -- --reporter dot: 573 passing (full suite).
• npm run lint: passes; existing ESLint-env migration warnings remain.
• git diff --check: passes.
• Regression tests cover routing through the actual GET/HEAD handlers and AEM proxy, Range/206 and media headers, authentication, upstream errors, rendering-mode selection and route propagation, metadata precedence/empty semantics, structured section values, and empty block/cell handling.
• Local Chrome check: generated an original MP4, decoded and played it inside an iframe through the actual handlers/proxy with a mocked AEM upstream. Confirmed a browser-issued Range request, 206 response, site-token forwarding, and a bodyless HEAD. Browser and local server were stopped afterward.

Not deployed. Production Experience Workspace/canvas validation against the affected sites remains pending; the local playback check is a synthetic iframe fixture, not a deployed canvas session.

[hannessolo]

Scope clarification for adobe/da-live#1695: adobe/da-live#1704 already fixed the da-live client-preview rendering-mode gate and legacy metadata preservation. Its stated scope explicitly excludes initial server-rendered HTML and standalone previews.

The #1695 work here is the remaining da-universal initial-rendering path: propagate the effective site rendering mode, preserve legacy section-metadata blocks, and extract structured values correctly for rendering v2. This does not duplicate the merged da-live fix.

Related drafts: adobe/da-nx#992 covers standalone Quick Edit; adobe/da-live#1725 covers remaining structured-value extraction and empty-cell/block serialization. Production-site validation remains pending.