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API errors

Current failure behavior​

ProcessController.gradeExam wraps CSV parsing, image processing, OCR, and grading in one try block. If any exception escapes those operations, the controller:

  1. Logs the exception server-side.
  2. Returns HTTP 500 Internal Server Error.
  3. Sends an empty response body.

The response does not expose a structured error code or message.

What is not defined​

The source does not define product-specific responses for missing multipart parts, malformed CSV, unreadable images, unsupported image formats, OCR initialization failure, oversized uploads, authentication failures, or rate limits. Do not treat those cases as a documented 4xx contract.

The endpoint is unauthenticated. A public deployment should not be considered safe until authentication, request limits, input validation, structured errors, and controlled debug output are implemented and tested.