Troubleshooting

This pages provides quick solutions for common issues when integrating OpenAPI-based backends with Azure API Management (APIM).

404 Errors: Differentiating APIM vs Backend

It usually confuses to determine whether a 404 Not Found error originates from APIM (missing operation) or the backend service (missing route). So we added a policy to help distinguish these cases.

{
    "statusCode": 404,
    "message": "The requested API endpoint could not be found in API Management. Please verify the URL or route."
}

If you see this message, the 404 is from APIM, meaning the requested operation is not defined in the imported OpenAPI spec. If you get a standard 404 response from your backend (e.g., HTML page or different JSON structure), then the route is missing in your backend service.