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When a request fails, the Customer API returns a JSON body with a consistent shape.

Error response shape

Every error has two fields:

Error codes

Handling errors in code

A pattern that covers the cases worth automating — retry rate_limited with backoff, and surface everything else:
These are errors from the Customer API (flameproxies.com/api/customer). Problems with proxy traffic through proxy.flameproxies.com — such as 407 Proxy Authentication Required — come from a different system. See Connection debugging.

Next steps

Rate limits

The per-key limit, and how to stay under it.

API authentication

Fix unauthorized errors.