All error codes

invalid_image_url

HTTP 422 A valid http(s) image URL is required

What happened

The url is missing, does not begin with http or https, or is not a well-formed URL.

What to do

Send an absolute http(s) URL pointing directly at the image file, then repeat the request.

Retrying

Fix the request and send it again.

How it arrives

{
    "type": "https://docs.fiberax.com/errors/invalid_image_url",
    "title": "A valid http(s) image URL is required",
    "status": 422,
    "code": "invalid_image_url",
    "request_id": "a277dcd1ca652c65"
}

Branch your code on code, never on the wording of title.