Encounter errors tp add pre-function plugins with lua script content. Syntax check failed.

[nighteblis]

Issue summary

Encounter errors tp add pre-function plugins with lua script content. Syntax check failed.

Your environment

Kong node: http://kong:50001 v0.14.1 — Kong-Dashboard v3.5.0

Docker Env:
Client:
Version: 17.09.0-ce
API version: 1.32
Go version: go1.8.3
Git commit: afdb6d4
Built: Tue Sep 26 22:41:23 2017
OS/Arch: linux/amd64

Server:
Version: 17.09.0-ce
API version: 1.32 (minimum version 1.12)
Go version: go1.8.3
Git commit: afdb6d4
Built: Tue Sep 26 22:42:49 2017
OS/Arch: linux/amd64
Experimental: false

Issue description

Steps:

1. add service
2. add route
3. add plugins on route
   a. pre-function
   b. return kong.response.exit(401,"error")

Check failed with giving the message "Error parsing pre-function #1: [string "return kong.response.exit(401"]:1: ')' expected near ''" , that can not add.

Expected behavior

I could add the plugins by using the admin api.

Steps to reproduce

Good to have