Best and fastest Roblox user checker using API no need proxies only user.txt file

Roblox-user-checker.py

import requests
import time


header = {
'accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9',
'accept-encoding': 'gzip, deflate, br',
'accept-language': 'en-US,en;q=0.9',
'cookie': 'GuestData=UserID=-1383991535; RBXEventTrackerV2=CreateDate=1/8/2022 5:26:54 PM&rbxid=3210521638&browserid=124494138220; rbx-ip2=; RBXImageCache=timg=37376434353835342D343837382D346337362D396634382D6465383238393231326439362538372E3135342E3132302E31303225312F382F323032322031313A30343A313420504D96CD5DB2BCBE3E6623F9B5DCE3851B511345BB70',
'sec-ch-ua': '" Not;A Brand";v="99", "Microsoft Edge";v="97", "Chromium";v="97"',
'sec-ch-ua-mobile': '?0',
'sec-ch-ua-platform': '"Windows"',
'sec-fetch-dest': 'document',
'sec-fetch-mode': 'navigate',
'sec-fetch-site': 'none',
'sec-fetch-user': '?1',
'upgrade-insecure-requests': '1',
'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36 Edg/97.0.1072.55}',}
iNaWaR = 'user.txt'
file = open(iNaWaR, 'r')
while True:
    rb = file.readline().split('\n')[0]
    if rb == '':
        break
    NaWaR = f'https://auth.roblox.com/v2/usernames/validate?request.username={rb}&request.birthday=04%2F15%2F02&request.context=Signup'
    rq = requests.get(NaWaR, headers=header)
    if 'Username is valid' in rq.text:
        print(f'Available -->> {rb}')
        with open('Available-RB.txt', 'a') as x:
            tl = 'By iNaWaR -->  '
            x.write(tl + rb + '\n')
            time.sleep(0)
    elif 'Usernames cannot start or end with _.' in rq.text:
        print(f'Unavailable -->> {rb}')
    elif 'Username is already in use' in rq.text:
        print(f'Unavailable -->> {rb}')
    elif 'Username not appropriate for Roblox' in rq.text:
        print(f'Unavailable -->> {rb}')
    elif 'Usernames can be 3 to 20 characters long' in rq.text:
        print(f'Unavailable -->> {rb}')
    elif 'Only a-z, A-Z, 0-9, and _ are allowed' in rq.text:
        print(f'Unavailable -->> {rb}')
    elif 'Username can’t start or end with _' in rq.text:
        print(f'Unavailable -->> {rb}')
    else:
        print(f'Error --> {rb}')