- New
gqErrors middleware, with server stack-trace.
- feat: Add `json` param to `response`. Now it's available for middleware in bubbling phase (res.json).
- experimental: deferMiddleware, right now it's only inform Relay that NetworkLayer support this feature. See discussion about `defer` here [relay/issues/288](https://github.com/
facebook/relay/issues/288)
