after that time, caches will always check back with the origin server to see if a document is changed. expires headers are supported by practically every cache.
过了这个时间,缓存器就会向源服务器发送请求,检查文档是否被修改。
this limitation is known as the same origin server security policy.
这项限制就是相同初始服务器安全性策略。
the origin server specifies the component's etag using the etag response header.
原服务器指定组件的etag使用,etag响应标头。
the origin server is the source of truth for content and is capable of serving all of the content that is available on the cdn.
源服务器里内容是最正确的,是内容的最初来源。 它可以提供cdn能提供的所有内容。
avoiding internet traffic congestion: the direct route between the origin server and the akamai edger servers may be congested because of internet traffic.
避免internet通信流拥挤:由于internet通信流不稳定,起源服务器与akamai边缘服务器之间的直接路由可能很拥挤。
requests can be routed to gateway caches by a number of methods, but typically some form of load balancer is used to make one or more of them look like the origin server to clients.
请求有几种方法被路由到网关缓存服务器上:其中典型的是让用一台或多台负载均衡服务器从客户端看上去是源服务器;
this request could not be forwarded to the origin server or to any parent caches.
这项要求不可能提交给原籍国的服务器或向任何父母缓存。