1Z0-1127-25 Deploying and Managing Generative AI on OCI Practice Question
A developer is troubleshooting an OCI Generative AI inference request that returns a 400 Bad Request error. Which three common causes could result in this error? (Choose three.)
⚠ Common exam trap
Oracle often tests the distinction between HTTP 4xx status codes, where candidates confuse 400 Bad Request (client-side malformed request) with 401 Unauthorized (invalid credentials) or 403 Forbidden (insufficient permissions), leading them to incorrectly select invalid API key as a cause for a 400 error.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Incorrect endpoint URL
A 400 Bad Request error indicates the server cannot process the request due to client-side issues. An incorrect endpoint URL (A) is a common cause because the request is sent to the wrong OCI Generative AI service endpoint (e.g., using a chat endpoint for a text generation model), leading to a malformed request that the server rejects. Missing required parameters (C) in the request body, such as 'compartmentId' or 'modelId', also triggers a 400 error as the API cannot validate or process the inference without them. Exceeding the model's maximum token limit (D) results in a 400 error because the input or output exceeds the model's configured token capacity, which the API validates before processing.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Incorrect endpoint URL
Why this is correct
A wrong URL may cause the request to be malformed or routed incorrectly, resulting in a 400.
- ✗
Invalid API key in the request header
Why it's wrong here
An invalid API key results in a 401 Unauthorized error.
- ✓
Missing required parameters in the request body
Why this is correct
Required fields like 'modelId' or 'prompt' are omitted.
- ✓
Exceeding the model's maximum token limit
Why this is correct
The input or output exceeds the model's token limit, causing a bad request.
- ✗
Network connectivity issues
Why it's wrong here
Connectivity issues lead to timeouts or 5xx errors, not 400.
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