ETags are used in conjunction with the "If-None-Match" header on a GET request by savvy server developers to take advantage of the client's (e.g. browser) cache.
聪明的服务器开发者会把ETags和GET请求的“If - None - Match”头一起使用，这样可利用客户端(例如浏览器)的缓存。
ETags are used in conjunction with the "If-None-Match" header on a GET request by savvy server developers to take advantage of the client's (e.g. browser) cache.
聪明的服务器开发者会把ETags和GET请求的“If - None - Match”头一起使用，这样可利用客户端(例如浏览器)的缓存。
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