Getting 407 Error but my proxies 100% fine

Hello! I'm trying to get access to API but can't understand what's problem with 407 ERROR.
My proxies 100% correct cause i get cookies with them.
Tell me, maybe i'm missing some requests?

_CONFIGS = [
    {
        "name": "IPRoyal Korea Residential",
        "proxy": "geo.iproyal.com:51204",
        "auth": "MYPROXYINFO",
        "location": "South Korea",
        "provider": "iproyal",
    }
]

def get_proxy_config(proxy_info):
    proxy_url = f"http://{proxy_info['auth']}@{proxy_info['proxy']}"
    logger.info(f"Proxy being used: {proxy_url}")
    return {
        "http": proxy_url,
        "https": proxy_url
    }

USER_AGENTS = [
    "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.6422.113 Safari/537.36",
    "Mozilla/5.0 (Macintosh; Intel Mac OS X 13_5_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.6367.78 Safari/537.36",
    "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.6422.61 Safari/537.36",
]

BASE_HEADERS = {
    "accept": "application/json, text/javascript, */*; q=0.01",
    "accept-language": "ru-RU,ru;q=0.9,en-US;q=0.8,en;q=0.7",
    "origin": "http://www.encar.com",
    "referer": "http://www.encar.com/",
    "sec-fetch-dest": "empty",
    "sec-fetch-mode": "cors",
    "sec-fetch-site": "cross-site",
    "priority": "u=1, i",
}

def get_dynamic_headers():
    ua = random.choice(USER_AGENTS)
    headers = BASE_HEADERS.copy()
    headers["user-agent"] = ua
    headers["sec-ch-ua"] = '"Google Chrome";v="125", "Chromium";v="125", "Not.A/Brand";v="24"'
    headers["sec-ch-ua-mobile"] = "?0"
    headers["sec-ch-ua-platform"] = '"Windows"'
    return headers

last_request_time = 0

async def rate_limit(min_interval=0.5):
    global last_request_time
    now = time.time()
    if now - last_request_time < min_interval:
        await asyncio.sleep(min_interval - (now - last_request_time))
    last_request_time = time.time()

there's more but discord limits