9

我正在向通过 CloudFront 提供的文件发送 ajax HEAD 请求。在 S3 中为此文件设置的 max-age 为 1800。它总是错过 CloudFront 中的缓存。

这是预期的行为吗？或者是否需要配置任何内容以使 HEAD 请求到达云端，直到 max-age 中的指定时间？

编辑

两个连续的头部请求/响应如下：

请求 1

Request URL:https://360-dev.web-dev.mydomain.com/resources/data/master.json
Request Method:HEAD
Status Code:304 Not Modified
Remote Address:52.84.105.65:443

Response Headers
view source
Cache-Control:max-age=1800, private
Connection:keep-alive
Date:Tue, 27 Sep 2016 10:20:56 GMT
ETag:"213cd6a833efde3409a8dc3808e01c46"
Last-Modified:Thu, 22 Sep 2016 11:35:17 GMT
Server:AmazonS3
Via:1.1 f2eee4ce6eb32d1b7578af7dc2c917de.cloudfront.net (CloudFront)
X-Amz-Cf-Id:QgmjSCu2uIam9Jmo63a8g-qytd6OsyalTEpNUGOaMp0EtJkheENkIA==
x-amz-storage-class:REDUCED_REDUNDANCY
X-Cache:Miss from cloudfront

Request Headers
view source
Accept:*/*
Accept-Encoding:gzip, deflate, sdch, br
Accept-Language:en-US,en;q=0.8
Cache-Control:max-age=0
Connection:keep-alive
Content-Type:application/x-www-form-urlencoded
Cookie:UnicaID=gU6xZpJesOr-Z6LqaYt; __utma=227427714.2013234852.1473314245.1473314245.1473314245.1; __utmz=227427714.1473314245.1.1.utmcsr=google|utmccn=(organic)|utmcmd=organic|utmctr=(not%20provided); SMIDENTITY=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; SMSESSION=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; CloudFront-Policy=eyJTdGF0ZW1lbnQiOlt7IlJlc291cmNlIjoiaHR0cHM6Ly8zNjAtZGV2Ki53ZWItZGV2LmJtcy5jb20vKiIsIkNvbmRpdGlvbiI6eyJEYXRlTGVzc1RoYW4iOnsiQVdTOkVwb2NoVGltZSI6MTQ3NTAwNjQ2OX19fV19; CloudFront-Signature=SvN~2tPgK~N~GzoY2pVOFZN1nic4t2Kgq3AucGD8gvuGS4iqjnlBIceFM~k5ZHZRlSbWa8V8QZzoYuMZvY2GvAjGJrDigJD93Vxq0qCm6alexx5~yxtX1FebaFAp68fgqo1tbjVYm7nCYrvGl2RebFcucbN6RC-Lo6aBvPnIgTrXqa6OrJKgxQQxii~LE7l9XnnKHWoYnrjBZEFWuqJ5fHrWK1MennKKAh67nOO9OGznX9slQRXBGCpNV4SCICzQEMaMxHBANjVE7nTfP9YussBV-AXYaQdkvdNt6LWcDotZu~wDDqlrBpNcru6EqJackyUAOvS982t4BPGAiL1jjQ__; CloudFront-Key-Pair-Id=APKAIOWOUVDQ5VOOZ5IA; Custom-Insite-Cookie=eyJMREFQR3JvdXAiOlsiIl0sInVzZXJOYW1lIjoic3VicmFtbTIiLCJpbnRlcm5ldCI6dHJ1ZSwiZW52aXJvbm1lbnQiOiIzNjAtZGV2IiwibG9naW5EYXRlIjoiMjAxNi0wOS0yN1QxMDowMTowOS4zODhaIn0%3D; rtFa=fa1/uY2RI0bciZ9ZZSoGEQfpjl1ezr5wmPN7/U+ySlNuu2iSn1blhq9qeQBW2Iq3gSllMAAlV5troHg6UfB2KKR7TkNU5Q3IS3TnYS+XJJxSaLXv5ghig7fDjU1KKCs9IbrJaCW9XIMzgtfDlxXE/EHRhD3+u5xX4KegxZwGjWMMNM0QOOZrtMvk98h08BhpKfAChj8CPmeaghOehRhgxbOlLwQ+1AHIgrZ4Y8n7sbW4zw4NnAPhTgdtfJ43midH1pfqIH5ijy5x4a+61nczQFkI9+WxMfqsBVJDDteeBLVc+NPuWw84JRlar01jB4Qpm0VFzt8sXMOApfNosrsgR1iQmlcdZqSpMcrKIEwKw11GZiyNGyVzMd3R1/vzQI9gIAAAAA==
Host:360-dev.web-dev.mydomain.com
If-Modified-Since:Thu, 22 Sep 2016 11:35:17 GMT
If-None-Match:"213cd6a833efde3409a8dc3808e01c46"
Referer:https://360-dev.web-dev.mydomain.com/home.html
User-Agent:Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36
X-Requested-With:XMLHttpRequest

请求 2

Request URL:https://360-dev.web-dev.mydomain.com/resources/data/master.json
Request Method:HEAD
Status Code:304 Not Modified
Remote Address:52.84.105.65:443

Response Headers
view source
Cache-Control:max-age=1800, private
Connection:keep-alive
Date:Tue, 27 Sep 2016 10:22:09 GMT
ETag:"213cd6a833efde3409a8dc3808e01c46"
Last-Modified:Thu, 22 Sep 2016 11:35:17 GMT
Server:AmazonS3
Via:1.1 0f99540d655ae57ac39033aac52161f5.cloudfront.net (CloudFront)
X-Amz-Cf-Id:3ci8nzrDmmcJMq7_ElxxU6HPbedPqp0P1fDXiDUFIO7b-qm_R2bxMg==
x-amz-storage-class:REDUCED_REDUNDANCY
X-Cache:Miss from cloudfront

Request Headers
view source
Accept:*/*
Accept-Encoding:gzip, deflate, sdch, br
Accept-Language:en-US,en;q=0.8
Cache-Control:max-age=0
Connection:keep-alive
Content-Type:application/x-www-form-urlencoded
Cookie:UnicaID=gU6xZpJesOr-Z6LqaYt; __utma=227427714.2013234852.1473314245.1473314245.1473314245.1; __utmz=227427714.1473314245.1.1.utmcsr=google|utmccn=(organic)|utmcmd=organic|utmctr=(not%20provided); SMIDENTITY=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; SMSESSION=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; CloudFront-Policy=eyJTdGF0ZW1lbnQiOlt7IlJlc291cmNlIjoiaHR0cHM6Ly8zNjAtZGV2Ki53ZWItZGV2LmJtcy5jb20vKiIsIkNvbmRpdGlvbiI6eyJEYXRlTGVzc1RoYW4iOnsiQVdTOkVwb2NoVGltZSI6MTQ3NTAwNjQ2OX19fV19; CloudFront-Signature=SvN~2tPgK~N~GzoY2pVOFZN1nic4t2Kgq3AucGD8gvuGS4iqjnlBIceFM~k5ZHZRlSbWa8V8QZzoYuMZvY2GvAjGJrDigJD93Vxq0qCm6alexx5~yxtX1FebaFAp68fgqo1tbjVYm7nCYrvGl2RebFcucbN6RC-Lo6aBvPnIgTrXqa6OrJKgxQQxii~LE7l9XnnKHWoYnrjBZEFWuqJ5fHrWK1MennKKAh67nOO9OGznX9slQRXBGCpNV4SCICzQEMaMxHBANjVE7nTfP9YussBV-AXYaQdkvdNt6LWcDotZu~wDDqlrBpNcru6EqJackyUAOvS982t4BPGAiL1jjQ__; CloudFront-Key-Pair-Id=APKAIOWOUVDQ5VOOZ5IA; Custom-Insite-Cookie=eyJMREFQR3JvdXAiOlsiIl0sInVzZXJOYW1lIjoic3VicmFtbTIiLCJpbnRlcm5ldCI6dHJ1ZSwiZW52aXJvbm1lbnQiOiIzNjAtZGV2IiwibG9naW5EYXRlIjoiMjAxNi0wOS0yN1QxMDowMTowOS4zODhaIn0%3D; rtFa=fa1/uY2RI0bciZ9ZZSoGEQfpjl1ezr5wmPN7/U+ySlNuu2iSn1blhq9qeQBW2Iq3gSllMAAlV5troHg6UfB2KKR7TkNU5Q3IS3TnYS+XJJxSaLXv5ghig7fDjU1KKCs9IbrJaCW9XIMzgtfDlxXE/EHRhD3+u5xX4KegxZwGjWMMNM0QOOZrtMvk98h08BhpKfAChj8CPmeaghOehRhgxbOlLwQ+1AHIgrZ4Y8n7sbW4zw4NnAPhTgdtfJ43midH1pfqIH5ijy5x4a+61nczQFkI9+WxMfqsBVJDDteeBLVc+NPuWw84JRlar01jB4Qpm0VFzt8sXMOApfNosrsgR1iQmlcdZqSpMcrKIEwKw11GZiyNGyVzMd3R1/vzQI9gIAAAAA==
Host:360-dev.web-dev.mydomain.com
If-Modified-Since:Thu, 22 Sep 2016 11:35:17 GMT
If-None-Match:"213cd6a833efde3409a8dc3808e01c46"
Referer:https://360-dev.web-dev.mydomain.com/home.html
User-Agent:Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36
X-Requested-With:XMLHttpRequest
4

1 回答 1

3

请参阅下面的“行为”图像以供参考：

在此处输入图像描述

注意事项：

  1. 行为按照定义的优先级顺序处理“路径模式”，确保打开正确的行为以查看其配置方式。
  2. 如果您的服务器不发送诸如“Cache-Control max-age、Cache-Control s-maxage 和 Expires to objects”之类的缓存标头，默认 TTL 将发挥作用。
  3. Min & max 与发送的 HTTP 标头进行交互，并按照它们的名称进行操作。
  4. 如果在 head 请求中你有不同的 headers，所有的 headers 都将成为 cloud front 用来缓存它的 key 的一部分，并将该 key 与新请求进行比较，以确定它是否与以前的 name 相同。
  5. 如果 cookie 不同，最值得注意的是身份验证和会话密钥（以及任何其他密钥），并且如果转发 cookie 选项未设置为“无”，它将使用 cookie 值作为密钥的一部分（这很可能会导致您的缓存很少使用）。6）如果使用查询字符串转发，也会使其成为key的一部分。

现在，您可以从该信息中确定它，或者如果您不能在确保其行为正确之后粘贴您的行为屏幕的屏幕截图，我可以提供进一步的帮助。

于 2016-10-05T22:08:59.390 回答