add

 local http_request = require "http_request"
 local switch_controller = require "switch_controller"
 
+--- those methods will be degraded. nginx will send response directly without redirecting to backend servers.
+local degrade_methods = {
+   "method1",
+   "method2"
+
+
+}
+
+function do_degrade()
+  local method = http_request.get_req_param("method")        
+  for i, v in ipairs(degrade_methods) do
+        if method == v then
+                ngx.log(ngx.ERR, "method is degraded.", method)
+                ngx.exit(ngx.HTTP_OK)
+        end
+  end
+
+end
  
 function do_direct(redirectPath)
         --- processing:  api.yoho.cn/operation/get/home?xxxxx
@@ -101,6 +119,11 @@ end
 ---- main
 function main()
 
+  local _status, _msg = pcall(do_degrade)
+  if not _status then
+        ngx.log(ngx.ERR, "call method [do_degrade] failed.", _msg)
+  end
+
    local status, ret = pcall(get_redirect_url)
    if not status then
         ngx.log(ngx.ERR, "call method [get_redirect_url] failed.", ret)