Fixed: Gemini Pro cURL Error: “Please use a valid role: user, model.”
What causes this error?
Omitting the required"role"field in the JSON payload or using an access token that doesn’t represent the intended service account.
Fix:
-> Replace your original cURL command with this version:
curl -X POST \
-H "Authorization: Bearer $(gcloud auth print-access-token --impersonate-service-account <service-account-email>)" \
-H "Content-Type: application/json" \
-d '{
"contents": {
"role": "user",
"parts": [{
"text": "shortest sentence with 4 colors and 5 shapes"
}]
},
"generationConfig": {
"temperature": 0.2,
"maxOutputTokens": 512
}
}' \
"https://us-west1-aiplatform.googleapis.com/v1/projects/<project-id>/locations/us-west1/publishers/google/models/gemini-pro:generateContent"
Quick Token Check
Verify that your access token is for the correct service account.
-> Run the following command:
accessToken=$(gcloud auth print-access-token --impersonate-service-account <service-account-email>)
curl -i "https://www.googleapis.com/oauth2/v3/tokeninfo?access_token=$accessToken"
This streamlined solution ensures that you’re including the necessary "role" field and using the proper service account token.
Still stuck with the issue?
Drop me an email at dhanuskkar@cybermindworks.com (response time within 3 hrs)
