@agentzh, thank you. Even though I am new to nginx I went through to understand how nginx works and understood how nginx modules work. I just need very few pointers, like lua modules receives request and forwards to lua interpreter, after processing the request how it sends details. I need to overall details not complete in depth details, so that I can spend more time on code in productive way. It will make easy to understand in better way. I need to use C language. Please give very small notes with 5 points are also fine for me to start on it.