• Bug

  • My logs are full of "PHP Warning: Undefined array key "HTTP_USER_AGENT""

Hey guys,

Looking at my logs I see :

Two possibilities

  • There's a bug in some of the code where we grab / log user agents
  • The client didn't have a user agent

Are these all from the same IP? Do you see the same error logs from your IP if login?

Hi,

The IP is actually mine from internal network (10.xx.xx.xx) and I'm using Chrome.

Looking on internet I see a lot of people reporting that kind of behavior with PHP 8.x

I'm not aware of anything regarding PHP changing the way they handle $_SERVER vars. We literally just pull $_SERVER['HTTP_USER_AGENT'])

I'm not seeing any errors like this for the demo. Are you using any privacy/security focused browser extensions that are changing your user agent?

Besides that, I remember your refer header issue was due to your custom Apache config, so might be worth looking there.

a month later
6 days later

Hey there ! Best wishes guys ! 🙂

Not really actually. I thought it was what caused my instance to be REEEEEEALLY slow but it wasn't.

Slowliness was caused by a guy who tried to log 39K times on the client portal, causing the logs to be a bit… messy let's say. I blacklisted the IP in my FW (would be great to have some kind of "jail" in the app) and now it's snappy again 🙂

    • Bigbug

    • Post #10
    • Edited

    qduchenne When you say "guy" are you referring to your client? or some stranger/bot?

    if it's a bot follow the instructions to setup fail2ban

    additionally you can put it behind Cloudflare

        Bigbug I mean some stranger/bot.

        Thanks 🙂 I thought Fail2Ban was only for SSH. Looks like I still have things to learn 🥳

            I think Fail2Ban based off access logs is probably the best solution.

            The agent login does have a rate limit. We're planning on merging both login flows so they will both benefit from the login failure rate limit.