Microsoft Azure Custom Vision API nodeJS - classifyImageUrl() error "BadRequestImageUrl" - node.js

Question

I try atm to classify an image via the API from Microsoft on nodeJS.
The network is alreaday trained and I can "connect" to the my algorithm. I want to send a base64 string as a dataUri but then I get this error-message: "Code: BadRequestImageUrl, message: Invalid image url"
The variable "img" is a base64 string (from a FHIR-Observation-Object) and correct (on a webside the url works with the base64).
I try out to senda image from Wikipedia. But then I have an other error: "NoFoundIteration / Invalid iteration"
const PredictionAPIClient = require("azure-cognitiveservices-customvision-prediction");
const predictionKey = "xxxx";
const endPoint = "https://southcentralus.api.cognitive.microsoft.com"
const projectId = "xxxxx";
const publishedName = "myMLName";
...
var img = 'iVBORw0KGgoAAAANSUhEUgAAAgAAAAJmCAYAAA...'; //base64
...
tempUrl= { url: 'data:image/png;base64,' + img };
...
predictor.classifyImageUrl(projectId, publishedName, tempUrl)
.then((resultJSON) => {
console.log("RESULT ######################")
//console.log(resultJSON);})
.catch((error) => {
console.log("ERROR #####################");
console.log(error);}
);
I should get a JSON form Microsoft Azure with the results.

Answer 1

Have a look to the documentation of the API behind the package you are using: https://southcentralus.dev.cognitive.microsoft.com/docs/services/Custom_Vision_Prediction_3.0/operations/5c82db60bf6a2b11a8247c14
You can see that Classify has 2 methods:
ClassifyImage, which is using an image in application/octet-stream
ClassifyImageUrl, which is using an url for input
Data URL are not supported, you must use classic URL (and the image must be publicly accessible: don't use an URL pointing to an endpoint that need an authentication)
For your iteration error, make sure that you use your iteration name in publishedName, not your project name.
Example here, with value in field "Published as":