Unclear The finding does not say what the dispatch header or dispatch value selects.
What
A side query is a smaller background request Claude Code sends to the model alongside the main conversation. Some requests carry a dispatch header, a label that tells the service how to route them. When a side query fails, it can now be sent again once with a fixed dispatch value in three cases:
headerless_decline: an HTTP 503 error on a request that was sent without a dispatch header.- Server or connection errors: a 5xx error or a connection failure. This case existed before.
retryable_4xx: HTTP 408, 409 or 429. These are resent using the client's usual retry allowance, unless the server marked its requested wait (Retry-After) as too long. Before, these codes were resent only when a header had been sent.
The record of a fallback resend now includes resend_dispatch. The records Claude Code keeps for successful and failed API calls now include a dispatch value, which defaults to none.
Why
Side queries are more likely to succeed when the routing layer turns a request down, instead of failing outright. The added dispatch value is diagnostic information and changes nothing you do.
The finding does not say what the dispatch header or dispatch value selects.