Hey Dheivendiran,
I'm not expert in the lua-resty-openidc framework, but I believe the logout uri should be `<hostname>/logout` in the browser and also in your client.
I could speculate further as to why, but I highly recommend looking through everything in the [lua-resty-openidc repo](https://github.com/zmartzone/lua-resty-openidc) for examples and in depth explanations. To include the issues other people have posted about.