Question

我使用以下代码来请求文件：

function getData(imageEndpoint) {
  return fetch(imageEndpoint, {
    mode: 'cors'
  })
    .then(response => {
      console.log(response);
    })
    .then(data => {
      if (!('caches' in window)) {
        return caches.open(cacheName)
        .then(cache => {
          return cache.put(imageEndpoint, data);
        });
      }
      return data;
    })
    .catch(e => {
      console.log('Request issue, ', e);
    });
}

以下错误消息中的哪些输出：

Failed to load http://localhost:7000/image.jpg: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8080' is therefore not allowed access. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

P.S服务器适用于:8000

当我添加cors header

时

  return fetch(imageEndpoint, {
    mode: 'cors',
    headers: {
      'Access-Control-Allow-Origin': '*'
    }
  })

引发以下错误：

http://localhost:7000/image.jpg 405 (Method Not Allowed)

index.html:1 Failed to load http://localhost:7000/image.jpg: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8080' is therefore not allowed access. The response had HTTP status code 405. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

您能否建议如何设置请求以便成功接收文件？

Answer 1

您需要在OPTIONS响应和POST响应中使用标头Access-Control-Allow-Origin：URL Here或Access-Control-Allow-Origin：*。您应该在POST响应中包含标题Access-Control-Allow-Credentials：true。

您的OPTIONS响应还应包括标题Access-Control-Allow-Headers：origin，content-type，accept以匹配请求的标头。

修复＆＃39; cors＆＃39;不同localhosts之间的请求。 405（不允许的方法）

1 个答案: