How to log all headers in nginx?

Question

As per title of this question, how do I go about logging all of the headers client browser has sent in Nginx? I also want to log response header. Note that I am using nginx as reverse proxy.

After going through documentation, I understand that I can log a specific header, but I want to log all of the headers.

I will accept hacky solution!

Answer 1

As @gauravphoenix said you need opnresty which comes with Lua. See https://github.com/openresty/lua-nginx-module/ for installing it. Once it's running then add in nginx

header_filter_by_lua_block {
  local h = ngx.req.get_headers()
  for k, v in pairs(h) do
    ngx.log(ngx.ERR, "Got header "..k..": "..v..";")
  end
}

Inspect your error log.

Answer 2

After much research, I can conclude that it is not possible out of the box.

Update- you can use openresty which comes with Lua. Using Lua one can do pretty cool things, including logging all of the headers to say, Redis or some other server