if_modified_since

Syntax: if_modified_since off | exact | before;
Default: if_modified_since exact;
Context: http, server, location

This directive appeared in version 0.7.24.

Specifies how to compare modification time of a response with the time in the “If-Modified-Since” request header field:

off
the “If-Modified-Since” request header field is ignored (0.7.34);
exact
exact match;
before
modification time of a response is less than or equal to the time in the “If-Modified-Since” request header field.
doc_nginx
2017-02-09 07:06:32
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