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。
If none of the name metaphones are a match, the job responsibilities metaphones are searched.
如果未找到任何名称变音位匹配，则搜索工作职责变音位。
If no match is found, then the string None found! Is returned.
如果不匹配，那么就会返回字符串None found 。
If none of the codes work, return to this screen and choose "no match works."
如果所有代码都无法工作，请返回此屏幕并选择“没有可用的代码”。
If none of the codes work, return to this screen and choose "no match works."
如果所有代码都无法工作，请返回此屏幕并选择“没有可用的代码”。
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