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This document summarizes the most common error codes returned by the Novita API platform, along with definitions, causes, and recommended solutions to help users troubleshoot efficiently.

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Error Code 400

Description: Invalid request parameters.
Solution:
Review the error message details and check whether the parameter formats, field names, or value ranges comply with the API documentation.

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Error Code 401

Description: API Key is missing or incorrect.
Solution:
  • Ensure the API Key is provided in the request;
  • Verify that the API Key is correct and has not expired;
  • If using environment variables or config files, confirm they are being read correctly during execution.

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Error Code 403

Description: Access denied due to insufficient permissions.
Solution:
  • Verify that your account associated with the API Key has permission to access the requested model;
  • Some models require identity verification to access:
    • Log in to the console and check your account’s verification status;
    • If not verified, complete identity verification first;
    • Alternatively, use an API Key from an already verified account.

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Error Code 429

Description: Rate limit exceeded (Too Many Requests).
Solution:
  • Check if the limit is due to TPM (tokens per minute) or RPM (requests per minute);
  • Refer to the official Rate Limits documentation;
  • To raise your rate limit, contact support or use a verified account.

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Error Code 503 / 504

Description: Backend timeout or service unavailable, often caused by high system load or throttling.

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Possible Causes:

  • GPU or CPU overload on model service nodes;
  • Long generation time on non-streaming requests exceeds gateway timeout;
  • Failures in downstream services (e.g., Redis, model engine);
  • Traffic shaping module activated surge protection and returned 503.
For API Users:
  • Enable retry mechanism: Use exponential backoff to prevent repeated overload;
  • Switch to streaming mode: Streaming responses return tokens as they’re generated, lowering latency and timeout risk;
  • Optimize client settings: Ensure client_timeout and proxy_timeout exceed 60 seconds;
  • Avoid peak periods: For high concurrency scenarios, retry during off-peak hours.
For Platform Ops:
  • Enhance monitoring and auto-scaling of model services;
  • Adjust gateway-level proxy_read_timeout appropriately;
  • Implement fine-grained throttling rules (e.g., priority queues, core-business prioritization);
  • Use Prometheus + Alertmanager to trigger alerts on 503/504 spikes.

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Error Code 500

Description: Internal server error—typically caused by backend exceptions or model engine crashes.
Solution:
  • These issues usually require platform-side resolution. Contact support to investigate logs and system resources;
  • Optionally, try switching models or falling back to a less resource-intensive configuration.

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Other Errors

For undefined or undocumented errors:
  • First, refer to the message field in the API response;
  • Next, check request logs or console traces;
  • Finally, contact Novita support or submit a ticket for further assistance.