Move custom header to include

doc/cache-invalidator.rst

@@ -51,6 +51,8 @@ Invalidate a URL with added header(s)::
         array('Cookie' => 'foo=bar; fizz=bang')
     )->flush();
 
+.. include:: includes/custom-headers.rst
+
 Refreshing Paths and URLs
 -------------------------
 
@@ -74,13 +76,7 @@ Refresh a URL with added header(s)::
         array('Cookie' => 'foo=bar; fizz=bang')
     )->flush();
 
-Optionally adding headers with invalidation request
--------------------------------------------------------
-
-.. note::
-    If adding the same headers on every invalidation request it would be preferrable
-    to apply these headers automatically rather than passing them explictly each time.
-    You can use a custom guzzle client to achieve this. See `Custom Guzzle Client` under :doc:`proxy clients <proxy-clients>`.
+.. include:: includes/custom-headers.rst
 
 .. _invalidate regex:
 

doc/includes/custom-headers.rst

@@ -0,0 +1,3 @@
+This allows you to pass headers that are different between purge requests.
+If you want to add a header to all purge requests, such as ``Authorization``,
+use a :ref:`custom Guzzle client <custom Guzzle client>` instead.

doc/proxy-clients.rst

@@ -114,9 +114,7 @@ For instance::
 Please note that purge will invalidate all variants, so you do not have to
 send any headers that you vary on, such as ``Accept``.
 
-The above allows you to pass headers that are different between purge requests.
-If you want to send headers for all purge requests, such as ``Authorization``,
-use a :ref:`custom Guzzle client <custom Guzzle client>` instead.
+.. include:: includes/custom-headers.rst
 
 Refresh
 ~~~~~~~