The HTTP 1.1 specification offers to invalidate cache entries (in the context of this article, this equates to remote caches) using specific HTTP request types only.
HTTP 1.1规范仅通过使用特定的HTTP请求类型即可使缓存项失效(在本文中，这与远程缓存等效)。
Although they are supposed to invalidate their caches when the backing file changes, that information isn't always sent to specification or acted on properly.
虽然他们应该无效缓存支持文件更改时，这些信息并不总是发送正确规范或行为。
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