Google apps script image to text OCR

function doGet(request) {
if (request.parameters.url != undefined && request.parameters.url != "") {
var imageBlob = UrlFetchApp.fetch(request.parameters.url).getBlob();
var resource = {
title: imageBlob.getName(),
mimeType: imageBlob.getContentType()
};
var options = {
ocr: true
};
var docFile = Drive.Files.insert(resource, imageBlob, options);
var doc = DocumentApp.openById(docFile.id);
var text = doc.getBody().getText().replace("\n", "");
Drive.Files.remove(docFile.id);
return ContentService.createTextOutput(text);
}else {
return ContentService.createTextOutput("request error");
}
}

Source: https://gist.github.com/tagplus5/07dde5ca61fe8f42045d