Disable the HTTP_PROXY header in the ispconfig and apps vhost files for apache and nginx.

ISPConfig itself does not read nor interpret this header, but there might be other
server components like PHP that might interact with it so I'll disable it just to be sure.

install/tpl/apache_apps.vhost.master

@@ -15,6 +15,10 @@
     SetHandler None
   </FilesMatch>
   
+  <IfModule mod_headers.c>
+	RequestHeader unset Proxy early
+  </IfModule>
+  
   <IfModule mod_php5.c>
     DocumentRoot {tmpl_var name='apps_vhost_dir'}
     AddType application/x-httpd-php .php

install/tpl/apache_ispconfig.vhost.master

@@ -82,6 +82,7 @@ NameVirtualHost *:<tmpl_var name="vhost_port">
 
   <IfModule mod_headers.c>
     Header always add Strict-Transport-Security "max-age=15768000"
+	RequestHeader unset Proxy early
   </IfModule>
 
   <tmpl_if name='apache_version' op='>=' value='2.3.3' format='version'>

install/tpl/nginx_apps.vhost.master

@@ -40,6 +40,7 @@ server {
 
                fastcgi_param   GATEWAY_INTERFACE       CGI/1.1;
                fastcgi_param   SERVER_SOFTWARE         nginx/$nginx_version;
+			   fastcgi_param   HTTP_PROXY              "";
 
                fastcgi_param   REMOTE_ADDR             $remote_addr;
                fastcgi_param   REMOTE_PORT             $remote_port;

install/tpl/nginx_ispconfig.vhost.master

@@ -36,6 +36,7 @@ server {
                fastcgi_busy_buffers_size 256k;
                fastcgi_temp_file_write_size 256k;
                fastcgi_read_timeout 1200;
+			   fastcgi_param HTTP_PROXY "";
         }
 
         location ~ /\. {

server/conf/apache_apps.vhost.master

@@ -14,6 +14,10 @@
   <FilesMatch "\.ph(p3?|tml)$">
     SetHandler None
   </FilesMatch>
+  
+  <IfModule mod_headers.c>
+	RequestHeader unset Proxy early
+  </IfModule>
 
   {tmpl_if name="enable_spdy" op="==" value="y"}
   <IfModule spdy_module>

server/conf/nginx_apps.vhost.master

@@ -32,6 +32,7 @@ server {
 
                fastcgi_param   GATEWAY_INTERFACE       CGI/1.1;
                fastcgi_param   SERVER_SOFTWARE         nginx/$nginx_version;
+			   fastcgi_param   HTTP_PROXY              "";
 
                fastcgi_param   REMOTE_ADDR             $remote_addr;
                fastcgi_param   REMOTE_PORT             $remote_port;