| Syntax: |  fastcgi_cache_revalidate  |  
|---|---|
| Default: |  fastcgi_cache_revalidate off;  |  
| Context: |  http, server, location |  
This directive appeared in version 1.5.7.
Enables revalidation of expired cache items using conditional requests with the “If-Modified-Since” and “If-None-Match” header fields.
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