--- embedaddon/lighttpd/doc/config/conf.d/ssi.conf	2013/10/14 10:32:48	1.1
+++ embedaddon/lighttpd/doc/config/conf.d/ssi.conf	2016/11/02 10:35:00	1.1.1.2
@@ -1,9 +1,9 @@
 #######################################################################
 ##
-##  Server Side Includes 
+##  Server Side Includes
 ## -----------------------
 ##
-## see /usr/share/doc/packages/lighttpd/ssi.html
+## See http://redmine.lighttpd.net/projects/lighttpd/wiki/Docs_ModSSI
 ##
 server.modules += ( "mod_ssi" )
 
@@ -11,6 +11,39 @@ server.modules += ( "mod_ssi" )
 ## which extensions should be ran through mod_ssi.
 ##
 ssi.extension              = ( ".shtml" )
+
+##
+## The  ssi.conditional-requests  directive only affects requests
+## handled by the SSI module and allows to declare which SSI pages
+## are cacheable and which are not. This directive can be enabled
+## or disabled globally and/or in any context.
+##
+## As the name of this directive suggests, conditional requests will
+## be handled appropriately for any SSI page for which the directive
+## is enabled. In particular, the "ETag" and "Last-Modified" headers
+## will both be sent. Conversely, these headers will NOT be sent for
+## pages for which the directive is disabled.
+##
+## The directive should be set to "enable" ONLY for requests that are
+## known to generate cacheable documents. An SSI page which only
+## includes contents from other static files and/or which uses SSI
+## commands that produce predictable output (e.g. the echo command
+## for the LAST_MODIFIED variable) is likely to be cacheable.
+##
+## The directive should be set to "disable" for ALL other documents,
+## that is, for SSI pages which depend on non-predictable input such
+## as (but not limited to) output from ssi exec commands, data from
+## the client's request headers (other than the request URI), or any
+## other non constant input such as the current date or time, the
+## client's user-agent, etc...
+##
+## Disabled by default.
+##
+## For further explanation of conditional requests, please see
+## Hypertext Transfer Protocol (HTTP/1.1): Conditional Requests
+## https://tools.ietf.org/html/rfc7232
+##
+#ssi.conditional-requests = "enable"
 
 ##
 #######################################################################