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Set user user_agent_*_var to empty string in case it's nil #81

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Set user user_agent_*_var to empty string in case it's nil #81

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4 changes: 2 additions & 2 deletions lua/anti_ddos_challenge.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -346,7 +346,7 @@ If you want to block access to bad bots / specific user-agents you can use this.

I added some examples of bad bots to block access to.
]]
local user_agent_blacklist_var = ngx.var.http_user_agent
local user_agent_blacklist_var = ngx.var.http_user_agent or ""
local user_agent_blacklist_table = {
{
"^$",
Expand Down Expand Up @@ -392,7 +392,7 @@ If you want to allow access to specific user-agents use this.

I added some examples of user-agents you could whitelist mostly search engine crawlers.
]]
local user_agent_whitelist_var = ngx.var.http_user_agent
local user_agent_whitelist_var = ngx.var.http_user_agent or ""
local user_agent_whitelist_table = {
--[[
{
Expand Down