by a *fchild* stanza. This action exists mostly for
convenience.
-A *match* stanza may also contain any number of *set* lines, as
-follows:
+A *match* stanza may also contain any number of the following,
+optional directives:
*set* 'HEADER' 'VALUE'::
named HTTP 'HEADER' in the request is set to 'VALUE' before
passing the request on to the specified handler.
+*xset* 'HEADER' 'VALUE'::
+
+ *xset* does exactly the same thing as *set*, except the
+ 'HEADER' is automatically prepended with the `X-Ash-`
+ prefix. The intention is only to make configuration files
+ look nicer in this very common case.
+
404 RESPONSES
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