add a note that proxy environment variables are either set or unset,

unless specific values are listed.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1507326 13f79535-47bb-0310-9956-ffa450edef68

diff --git a/docs/manual/mod/mod_proxy_http.xml b/docs/manual/mod/mod_proxy_http.xml
index 163836e67983e1cb4051e2b38a2d92e61fb4d633..700fb63adc5af4cbe647792bd69e550c37f6c0d7 100644 (file)
--- a/docs/manual/mod/mod_proxy_http.xml
+++ b/docs/manual/mod/mod_proxy_http.xml
@@ -56,7 +56,8 @@
     <p>In addition to the configuration directives that control the
     behaviour of <module>mod_proxy</module>, there are a number of
     <dfn>environment variables</dfn> that control the HTTP protocol
-    provider:</p>
+    provider. Environment variables below that don't specify specific values
+    are enabled when set to any value.</p>
     <dl>
         <dt>proxy-sendextracrlf</dt>
         <dd>Causes proxy to send an extra CR-LF newline on the end of a