Merge pull request #541 from andrerom/patch-1

Add description on tags_header options when using xkey

Author: dbu

Resources/doc/reference/configuration/proxy-client.rst

@@ -127,6 +127,10 @@ default ``xkey-softpurge``.
 
 Header for sending tag invalidation requests to Varnish.
 
+For use with ``tag_mode: purgekeys``, default VCL supports two options:
+- ``xkey-softpurge``: "Soft purge" by tags, expires relevant cache and allows for grace handling.
+- ``xkey-purge``: Purge by tags, removes relevant cache immediately.
+
 See the :ref:`FOSHttpCache library docs <foshttpcache:varnish configuration>`
 on how to configure Varnish to handle tag invalidation requests.