Example from RFC 7807 - Problem Details for HTTP APIs (https://tools.ietf.org/html/rfc7807)

example-problem-detail-response.txt

HTTP/1.1 400 Bad Request
Content-Type: application/problem+json
Content-Language: en

{
    "type": "https://example.net/validation-error",
    "title": "Your request parameters didn't validate.",
    "invalid-params": [
        {
            "name": "age",
            "reason": "must be a positive integer"
        },
        {
            "name": "color",
            "reason": "must be 'green', 'red' or 'blue'"
        }
    ]
}