server_at_capacity
HTTP 503 · code server_at_capacity · limit MaxConcurrentRequests
The server is handling as many requests as it is configured to allow.
When Photon sends it
Section titled “When Photon sends it”Sent before routing when MaxConcurrentRequests is set and reached. Retry-After: 1 is set so clients back off instead of retrying in a tight loop.
What the client should do
Section titled “What the client should do”Retry after the Retry-After interval, with back-off.
What the server owner can do
Section titled “What the server owner can do”Add capacity (more instances), or raise MaxConcurrentRequests if the machine has headroom.
Example response
Section titled “Example response”{ "type": "https://photon.agenticmarket.dev/errors/server_at_capacity", "title": "the server is at its concurrency limit, retry shortly", "status": 503, "code": "server_at_capacity", "limit": "MaxConcurrentRequests"}Match on the code field rather than on title, which is meant for people and may change. See all error codes.