mod_proxy.xml: mention DNS caching when reusing backend connection

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1803254 13f79535-47bb-0310-9956-ffa450edef68

diff --git a/docs/manual/mod/mod_proxy.xml b/docs/manual/mod/mod_proxy.xml
index 3c1b49b3e6494d818f541935bd245697b6a87452..cd2cbe6baaedf430c5aa1b9df36620b943a4af58 100644 (file)
--- a/docs/manual/mod/mod_proxy.xml
+++ b/docs/manual/mod/mod_proxy.xml
@@ -1079,7 +1079,10 @@ ProxyPass "/example" "http://backend.example.com" max=20 ttl=120 retry=300
     httpd and
     the backend server (regardless of protocol) tends to silently
     drop connections or when backends themselves may be under round-
-    robin DNS. To disable connection reuse,
+    robin DNS.
+    When connection reuse is enabled each backend domain is resolved
+    (with a DNS query) only once per child process and cached for all further
+    connections until the child is recycled. To disable connection reuse,
     set this property value to <code>On</code>.
     </td></tr>
     <tr><td>enablereuse</td>