NGINX Snippets

Most of these involve lua

Add to location

Return 200 with text

        add_header Content-Type text/plain;
        return 200 "hi";

    default_type 'text/plain';
    content_by_lua_block {
    ngx.req.read_body()
    local request_body = ngx.req.get_body_data()
    ngx.say(request_body)
    ngx.say('hello')
    ngx.say(ngx.var.arg_id)

    if string.find(ngx.var.request_body, "eth") then
        ngx.say('contains')
    end
    if ngx.re.match(ngx.var.request_body, "feth") then
       ngx.say('contains2')
    end

Loging vars in lua to error log

ngx.log(ngx.ERR, 'mytest or var');

p = 666
d = "23.42"
payload='{"d":[{"pres":'..(p)..',"temp":"'..(d)..'"}]}'
t = cjson.decode(payload)
print(t.d[1].temp) -- prints "23.42"

Getting Headers

local h = ngx.req.get_headers()
  for k, v in pairs(h) do
    ngx.say(k, ": ", v)
  end

local redis = require "nginx.redis"
local rdb = redis:new()
rdb:set_timeout(1000) -- 1 sec
local ok, err = rdb:connect("127.0.0.1", 6379)
if not ok then
  ngx.say("failed to connect: ", err)
  return
end

if res ~= ngx.var.http_authorization then
   ngx.say("Failed http authorization.")
   return
end

ngx.encode_base64("myuser:pass")

if res ~= ngx.var.http_authorization then
   ngx.say("Failed http authorization.")
   return
end

Resources

• https://github.com/david-martin/nginx-request-body-example
• https://github.com/jeremybusk/openresty/blob/dev/sandbox/nginx-lua-ptables.conf