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我有存储在 S3 上的图像和一个 lambda 函数来动态调整它们的大小。在执行此操作时，我添加CacheControl: 'max-age=31536000'到调整大小的图像并添加一个 Cache-Control 标头：

.then(buffer => {
  // save the resized object to S3 bucket with appropriate object key.
  S3.putObject({
    Body: buffer,
    Bucket: BUCKET,
    ContentType: 'image/jpg',
    CacheControl: 'max-age=31536000',
    Key: `uploads/${key}`,
  })

  // generate a binary response with resized image
  response.status = 200
  response.body = buffer.toString('base64')
  response.bodyEncoding = 'base64'
  response.headers['content-type'] = [{ key: 'Content-Type', value: 'image/jpg' }]
  response.headers['cache-control'] = [{ key: 'Cache-Control', value: 'public, max-age=31536000' }]
  callback(null, response)
})

如果缩略图已经生成，我就这样做：

if (!response.headers['cache-control']) {
  response.headers['cache-control'] = [{ key: 'Cache-Control', value: 'public, max-age=31536000' }]
}
callback(null, response)

在我的 Cloudfront 发行版中，我有以下设置：

  • 基于选定请求标头的缓存：无
  • 对象缓存：使用原始缓存标头

lambda 工作正常，但是当我查看 devtools 时，Chrome 似乎从不缓存图像。这是我得到的信息：

General
  Request URL: https://aws.mydomain.com/478/dd123cd5-1636-47d0-b756-e6c6e9cb28c0/normal/pic.jpg
  Request Method: GET
  Status Code: 200 
  Remote Address: 52.84.31.149:443
  Referrer Policy: no-referrer-when-downgrade
  age: 382

Response Headers
  content-length: 49192
  content-type: image/jpg
  date: Thu, 09 May 2019 20:41:42 GMT
  server: AmazonS3
  status: 200
  via: 1.1 261e801dca9c54ff576f39f96d80ede5.cloudfront.net (CloudFront)
  x-amz-cf-id: ZlheiBoNDuYDeuvZo0jBP6Zjpge5AonPGlCo_N2pHhHdGwV7DorKtA==
  x-amz-id-2: xkDxIB0qDJt5KMeHINq7/gaRII6EDBOsL3SlMuhMwJ84M/lak9E/tcRChv7vvYurD+2hYOT8kSI=
  x-amz-request-id: CAD9AE1E905BB13A
  x-cache: Hit from cloudfront

Request Headers
  :authority: aws.mydomain.com
  :method: GET
  :path: /478/dd123cd5-1636-47d0-b756-e6c6e9cb28c0/normal/pic.jpg
  :scheme: https
  accept: */*
  accept-encoding: gzip, deflate, br
  accept-language: en-US,en;q=0.9
  user-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.108 Safari/537.36

Control-Cache 不存在，我无法弄清楚...

当我使分发中的所有图像无效时，唯一的变化是 x-cache 的值：第一次加载时出现“来自云端的错误”（状态 200 并且图像加载正常）

4

1 回答 1

1

好的，显然不可能在源响应 lambda 中添加缓存控制标头。您必须在查看器响应 lambda 中执行此操作。像这样的东西：

exports.handler = (event, context, callback) => {
  const response = event.Records[0].cf.response;
  if (!response.headers['cache-control']) {
    response.headers['cache-control'] = [{
      key: 'Cache-Control',
      value: 'max-age=31536000'
    }];
  }
  callback(null, response);
};
于 2019-05-10T15:30:38.557 回答