February 2018
Beginner to intermediate
348 pages
9h 40m
English
Content preview from Nginx HTTP Server - Fourth Edition
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if_modified_since
Context: http, server, and location
Defines how Nginx handles the If-Modified-Since HTTP header. This header is mostly used by search engine spiders (such as Google web crawling bots). The robot indicates the date and time of the last pass. If the requested file has not been modified since then, the server simply returns a 304 Not Modified response code with no body.
This directive accepts the following three values:
- off: Ignores the If-Modified-Since header.
- exact: Returns 304 Not Modified if the date and time specified in the HTTP header are an exact match with the actual requested file modification date. If the file modification date is earlier or later, the file is served normally (200 OK response).
- before: Returns ...
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