Nginx reverse proxy for debugging

nginx.conf

worker_processes  1;

events {
    worker_connections  1024;
}

http {
    log_format bodylog '$remote_addr - $remote_user [$time_local] '
        '"$request" $status $body_bytes_sent '
        '"$http_referer" "$http_user_agent" $request_time '
        '<"$request_body" >"$resp_body"';

    server {
        listen       8080;
        server_name  localhost;

        # http://serverfault.com/questions/361556/is-it-possible-to-log-the-response-data-in-nginx-access-log
        access_log  /path/to/host.access.log  bodylog;

        lua_need_request_body on;

        set $resp_body "";
        body_filter_by_lua '
          local resp_body = string.sub(ngx.arg[1], 1, 1000)
          ngx.ctx.buffered = (ngx.ctx.buffered or "") .. resp_body
          if ngx.arg[2] then
            ngx.var.resp_body = ngx.ctx.buffered
          end
        ';

        location / {
            proxy_pass   https://foo.bar.com/;
        }
    }
}