cacheable for that amount of time or 0 to mark resource as cacheable for an unspecified amount of time (subject to browser heuristics). By default returns cache expiry of 10 years for resources requested with • time_info: dictionary of diagnostic timing information from the request. Available data are subject to change, but currently uses timings available from http://curl.haxx.se/libcurl/c/curl_easy_getinfo RequestHandler.on_connection_close() callback is called when the client has closed the connection (subject to limitations of the underlying network stack, any proxies, etc) * Static files can now be served

cacheable for that amount of time or 0 to mark resource as cacheable for an unspecified amount of time (subject to browser heuristics). By default returns cache expiry of 10 years for resources requested with queue. time_info: dictionary of diagnostic timing information from the request. Available data are subject to change, but currently uses timings available from http://curl.haxx.se/libcurl/c/curl_easy_getinfo RequestHandler.on_connection_close() callback is called when the client has closed the connection (subject to limitations of the underlying network stack, any proxies, etc) * Static files can now be served

rs struct AlwaysEqual; fn main() { let subject = AlwaysEqual; } 为了定义 AlwaysEqual，我们使用 struct 关键字，接着是我们想要的名称，然后是一个分号。 不需要花括号或圆括号！然后，我们可以以类似的方式在 subject 变量中创建 AlwaysEqual 的 实例：只需使用我们定义的名称，无需任何花括号或圆括号。设想我们稍后将为这个类型实现