Infura endpoint sometimes returns response with backoff_seconds value set to 0.
429 Too Many Requests {"jsonrpc":"2.0","id":3419,"error":{"code":-32005,"message":"project ID request rate exceeded","data":{"rate":{"allowed_rps":50,"backoff_seconds":0,"current_rps":52.3},"see":"https://infura.io/docs/ethereum/json-rpc/ratelimits"}}}
Infura endpoint sometimes returns response with backoff_seconds value set to 0.