If-Modified-Since 从何时更改 ; 假如修改
Incremental building means that only those files that have been modified since the builder was last called will be processed.
增量构建意味着:只有自上一次调用构建器以来被修改的文件才会被处理。
In simple terms, a cache entry is considered to be valid if the entity has not been modified since the Last-Modified value.
简单来说,如果实体值在Last - modified值之后没有被更改,则认为该缓存条目有效。
Listing 6 shows a header request specifying that only data that has been modified since November 11, 2003 be sent back from the server.
清单6显示了一个指定只有自2003年11月11日以后修改的数据才送回服务器的头。
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