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Diffstat (limited to 'doc/guix.texi')
| -rw-r--r-- | doc/guix.texi | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/doc/guix.texi b/doc/guix.texi index aaa7cbb66f..0cf865a672 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -33721,6 +33721,20 @@ Each criteria is specified by a string, then an equals sign, then another string. Currently, only one criteria is supported, checking if a nar is stored on another Nar Herder instance. +@item @code{ttl} (default: @code{#f}) +Produce @code{Cache-Control} HTTP headers that advertise a time-to-live +(TTL) of @var{ttl}. @var{ttl} must denote a duration: @code{5d} means 5 +days, @code{1m} means 1 month, and so on. + +This allows the user's Guix to keep substitute information in cache for +@var{ttl}. + +@item @code{negative-ttl} (default: @code{#f}) +Similarly produce @code{Cache-Control} HTTP headers to advertise the +time-to-live (TTL) of @emph{negative} lookups---missing store items, for +which the HTTP 404 code is returned. By default, no negative TTL is +advertised. + @end table @end deftp |