带有 `crossOrigin="Anonymous"` 的图像标签无法从 S3 加载成功

问题描述

在 JavaScript 中

In javascript

const image = new Image()image.crossOrigin = '匿名'image.src = 'https://s3.amazonaws.com/ch-static-beta/avatar/user/1a8fdd22d5ec11e784da0e28350150f71512059569.png'

会得到一个错误

http 头是

但是当我使用 curl 并使用此请求标头时，响应将成功.像这样.

But when I use the curl and with this request header, the response will success. like this.

推荐答案

那是缓存问题，*:

That's a caching issue, *:

重用缓存的响应.

When you perform the second request, the browser will reuse the cached response.

var rand = '?'+Math.random();
var no_cors = new Image();
no_cors.onload = loadCORS;
no_cors.src = 'https://s3.amazonaws.com/ch-static-beta/avatar/user/1a8fdd22d5ec11e784da0e28350150f71512059569.png' + rand;


function loadCORS(){
  var with_cors = new Image();
  with_cors.crossOrigin = 'anonymous';
  with_cors.src = no_cors.src;
  with_cors.onload = function(){console.log('loaded');};
  with_cors.onerror = function(){console.error('failed');};
}

所以要解决:[...] *
如需解决方法，请始终加载 crossOrigin 版本.
如需临时修复，请禁用缓存.

So for a fix: [...] *
For a workaround, always load the crossOrigin version.
For a temp fix, disable caching.

*似乎不可能将 S3 设置为这样做，请参阅 这个极好的答案，Michael - sqlbot，它还提供了其他服务器端解决方法.

*It seems it's not possible to setup S3 to do so, see this excellent answer by Michael - sqlbot, which also provides other server-side workarounds.

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