v2.10.4

🐛 Fixes

Preserve null propagation when multiple fragments select the same non-null field (PR #9032)

When a query uses multiple fragment spreads on the same parent type and a subgraph response is missing a required non-null field on a union member, the router now correctly returns null for the affected field rather than a partial object like {"__typename": "A"}.

The GraphQL specification requires that a non-null violation propagates null upward to the nearest nullable parent. Previously, if one fragment nullified a field, a subsequent fragment on the same parent could overwrite that null with a partial result — producing a spec-incorrect response.

By @abernix in https://github.com/apollographql/router/pull/9032

Reject invalid values for client library name and version (PR #8934)

Rejects invalid values (validated against a regex) for library name and version provided in headers or operation extensions, which are used for the Client Awareness feature and telemetry.

By @BoD in https://github.com/apollographql/router/pull/8934

Only delete coprocessor context keys from those that were sent in a given stage (PR #9519)

Addresses a race condition where context keys added by concurrent parallel subgraph stages could unintentionally be deleted.

By @rohan-b99 in https://github.com/apollographql/router/pull/9519

Normalize supergraph.path to support queries with and without trailing slashes (/) (PR #8860)

Normalize trailing / for supergraph.path to support /graphql and /graphql/. This works by stripping trailing / from both the configured path and the incoming query path to ensure they match, regardless of whether the config or query includes a trailing slash.

By @Jephuff in https://github.com/apollographql/router/pull/8860