I am very new user on website/web security. Recently I have noticed I am receiving traffic that referring url is http://127.0.0.3/res.php?key=0x5118873580bbfa7d9aaacf610cba86864b95b376&action=get&id=2780371.
Here, key is fixed but id is always changing. Also the bytes size is over 32000.
It would be very helpful if any expert explain what is it and if it is some kind of malicious please let me know how i will write firewall rules for stop it. Note, I am using google recaptcha.