英文:
Possible X-Cache values from Cloudfront
问题
X-Cache 是 CloudFront 的一个响应头，用于指示对象是否被缓存在 CloudFront 的边缘服务器上。以下是可能的 X-Cache 值：
Hit：对象命中了缓存，从缓存中返回。Miss：对象未命中缓存，从源服务器获取并返回。RefreshHit：对象在缓存过期之前被请求，因此返回缓存的内容，并在后台刷新缓存。Error：在处理请求时发生错误，无法返回对象。
这些是常见的 X-Cache 值，但并不是所有可能的值都有详细文档记录。
英文:
What are possible X-Cache values from CloudFront ? There does not seem to be a list of all possible values properly documented for this header from CloudFront.
答案1
得分: 1
在Amazon CloudFront中，来自CloudFront分发的响应中的X-Cache头提供了有关所请求对象是从CloudFront缓存中提供还是从源服务器获取的信息。该头部可以帮助您了解CloudFront分发的缓存行为和性能。
X-Cache头可以具有不同的值，每个值表示不同的缓存场景：
X-Cache: Miss from cloudfront: 这意味着所请求的对象未在CloudFront缓存中找到，因此CloudFront从源服务器获取了该对象，并将其存储在缓存中以供将来的请求使用。
X-Cache: Hit from cloudfront: 这表示所请求的对象在CloudFront缓存中找到，并直接从缓存中提供给查看者。与从源服务器获取对象相比，这将导致更快的响应时间。
X-Cache: RefreshHit from cloudfront: 当CloudFront从缓存中提供过时的对象的同时，从源服务器获取新副本以更新缓存时，会出现此值。这有助于保持可用性，同时确保缓存中的内容得到更新。
X-Cache: Error from cloudfront: 这表示在尝试从缓存或源服务器获取对象时发生了错误。错误详细信息通常在响应正文或其他头部中提供。
X-Cache: Hit from cloudfront (Using cache for this request): 当进行条件GET请求并且缓存的对象满足条件时，会观察到此值。CloudFront根据条件GET请求提供缓存的对象作为响应。
X-Cache: Miss from cloudfront (Generated by CloudFront): 当CloudFront动态生成响应时，通常由于查询参数或请求行为导致无法从缓存中提供响应时，会出现此值。
这些值提供了有关CloudFront的缓存行为的见解，并可以帮助您解决性能和与缓存相关的问题。请记住，CloudFront的行为和头部可能会随时间而变化，因此始终参考官方文档以获取最新信息是一个好习惯。
英文:
In Amazon CloudFront, the X-Cache header in the response from the CloudFront distribution provides information about whether the requested object was served from the CloudFront cache or fetched from the origin server. This header can help you understand the caching behavior and performance of your CloudFront distribution.
The X-Cache header can have different values, each indicating a different caching scenario:
X-Cache: Miss from cloudfront: This means that the requested object was not found in the CloudFront cache, so CloudFront fetched it from the origin server and stored a copy in the cache for future requests.
X-Cache: Hit from cloudfront: This indicates that the requested object was found in the CloudFront cache and was served directly from the cache to the viewer. This results in faster response times compared to fetching the object from the origin server.
X-Cache: RefreshHit from cloudfront: This value is seen when CloudFront serves a stale object from the cache while simultaneously fetching a new copy from the origin server to update the cache. This helps maintain availability while ensuring the cache is updated with fresh content.
X-Cache: Error from cloudfront: This indicates that an error occurred while trying to fetch the object from the cache or the origin server. The error details are typically provided in the response body or other headers.
X-Cache: Hit from cloudfront (Using cache for this request): This value is observed when a conditional GET request is made, and the cached object fulfills the conditions. CloudFront serves the cached object in response to the conditional GET request.
X-Cache: Miss from cloudfront (Generated by CloudFront): This value is seen when CloudFront dynamically generates a response, often due to a query parameter or request behavior that prevents the response from being served from the cache.
These values provide insights into the caching behavior of CloudFront and can help you troubleshoot performance and cache-related issues. Keep in mind that CloudFront's behavior and headers may evolve over time, so it's always a good practice to refer to the official documentation for the most up-to-date information.
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