从S3下载图像时出现Cors错误

Question

I am converting a div into an downloadable image.

function generateBanner() {
    domtoimage.toBlob(document.getElementById('wrapper'))
    .then(function(blob) {
      console.log("blob", blob)
      window.saveAs(blob, 'my-node.png');
    });
}

This code works fine. My problem is when this div has an image that is hosted in a S3 Bucket

for example:

<article id="wrapper">
    <p>{{ title }}</p>
    <img class="logo" src="{{ logo }}" alt="">
    <aside class="exclusive" ng-if="exclusive"></aside>
    <aside class="off" ng-if="percentoff">{{ percentoff }}
    </aside>
    <div class="produtos">
        <img src="https://s3-sa-east-1.amazonaws.com/teste-img-roge/Thumbs/0026954_30510_1_415.jpeg" alt="">
    </div>
    <aside class="valid" ng-if="valid"></aside>
    </article>

after that, when I click I got CORS errors, and I have no idea why.

In my s3 Configuration I have this:

<CORSConfiguration>
   <CORSRule>
 <AllowedOrigin>*</AllowedOrigin>
  <AllowedMethod>GET</AllowedMethod>
   <AllowedMethod>POST</AllowedMethod>
   <MaxAgeSeconds>3000</MaxAgeSeconds>
   <AllowedHeader>*</AllowedHeader>
   </CORSRule>
   </CORSConfiguration>

and still the same error. Any idea ? I tried few different configs in s3, and few approachs with javascript, but none of them worked.

Answer 1

You're missing <AllowedMethod>HEAD</AllowedMethod>

Then you should see the following headers:

Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET, HEAD, POST
Access-Control-Max-Age: 3000

Have in mind, that it could take a while before you see the correct headers.