title: set headers in cloudinary to avoid tainted canvas
body: <p>i'm making a simple drawing app in javascript for the client side and php for saving and loading. The app is hosted on heroku and the saved pictures are hosted on cloudinary. When the app loads a saved picture from cloudinary and draws it on the canvas, then the canvas becomes tainted because of cross-domain.
  I'm using the cloudinary php-API to save the image</p>
  
  <pre><code>\Cloudinary\Uploader::upload($canvasToDataUrl, array("public_id" =&gt; $saveName));
  </code></pre>
  
  <p>I tried adding a row in the options array with a few different syntaxes like   </p>
  
  <pre><code>, "headers" =&gt; "Access-Control-Allow-Origin:*"
  </code></pre>
  
  <p>I believe this header is not supported by the API, the supported headers are 'link' and 'X-Robots-Tag'.</p>
  
  <p>Is there a way to force my saved pictures to have the header "Access-Control-Allow-Origin:*"?</p>