# X_OUTBOUND_THROTTLED

## Means

an outbound HTTP call was told to wait

## Typical cause

the vendor answered a retryable status (429, 503) with a Retry-After header, and outbound()'s attempts or deadline ran out before the stated delay. meta.retryAfterSeconds carries the delay

## Fix

wait `meta.retryAfterSeconds` before calling `meta.vendor` again, or lower the call rate at the site that calls `outbound()`

[Core and runtime](/error-codes#core-and-runtime)