X-Real-IP support and Varnish PURGE config options

X-Real-IP for core functionality

Global config define REVERSE_PROXY_X_HEADERS

Config host and port for varnish PURGE

config option to specify PURGE protocol

exception in curl purge now shows error code

ipv6 x-real-ip addresses are now validated properly

X-Forwarded-Proto enabled by define

ext/log_logstash/main.php

@@ -21,7 +21,7 @@ class LogLogstash extends Extension
                 #"@request" => $_SERVER,
                 "@request" => [
                     "UID" => get_request_id(),
-                    "REMOTE_ADDR" => $_SERVER['REMOTE_ADDR'],
+                    "REMOTE_ADDR" => get_real_ip(),
                 ],
             ];