add

@@ -23,15 +23,34 @@ local local_cidr = {
     "123.206.73.107"
 }
 
+local function get_ip()
+
+  local realIp = nil
+  local xForwardFor =  ngx.var.http_x_forwarded_for;
+  if xForwardFor then
+    local ips={}
+    string.gsub(xForwardFor,'[^,]+',function(w) table.insert(ips, w) end )
+    realIp=ips[#ips]
+  end  
+  
+  -- if not exist, then setup remote_addr
+  if realIp == nil then
+    realIp = ngx.var.remote_addr;
+  end
+  
+  if realIp then
+    realIp=string.gsub(realIp,"%s","")
+  end
+
+  return realIp;
+  
+end
+
  -- check if ip is local
  -- depends on $real_ip which setup by  setup.lua
 function M:check_local_access()
     
-    local ip= ngx.var.real_ip 
-    if (ip == nil or ip == '') then
-      return false
-    end
-
+    local ip = get_ip()
 
     local is_local_ip = false
     for i = 1, #local_cidr do