Send requests...

Simple Python script (pastebin)

import requests 
from time import sleep 
 
while 1: 
    resp = requests.get('http://challs.xmas.htsp.ro:1341/') 
    if resp.ok: 
        print(resp.text) 
        if 'X-MAS' in resp.text: 
            print('!!!!!!!') 
            break 
    else: 
        print(resp) 
    sleep(0.25)

Flag: X-MAS{stay_at_home_and_respect_your_elders}