Turn one proxy address into the format your client expects.

http://USERNAME:PASSWORD@gw.databay.co:8888

Credentials are percent-encoded so reserved characters do not change the URL grammar.

gw.databay.co:8888

Use this form when a client exposes separate host, port, username, and password fields.

curl --fail --show-error \
  --proxy 'http://gw.databay.co:8888' \
  --proxy-user 'USERNAME:PASSWORD' \
  https://databay.com/what-is-my-ip/json

Keeps credentials out of the proxy URL. Prefer environment variables or an interactive prompt in saved scripts.

import os
from urllib.parse import quote
import requests

username = quote(os.environ.get("PROXY_USER", "USERNAME"), safe="")
password = quote(os.environ.get("PROXY_PASSWORD", "PASSWORD"), safe="")
proxy_url = f"http://{username}:{password}@gw.databay.co:8888"
proxies = {"http": proxy_url, "https": proxy_url}
response = requests.get(
    "https://databay.com/what-is-my-ip/json",
    proxies=proxies,
    timeout=20,
)
response.raise_for_status()
print(response.json())

The HTTPS key selects the route for an HTTPS destination; it does not mean the proxy itself uses HTTPS.

import { EnvHttpProxyAgent, fetch } from 'undici';

process.env.HTTP_PROXY = 'http://USERNAME:PASSWORD@gw.databay.co:8888';
process.env.HTTPS_PROXY = 'http://USERNAME:PASSWORD@gw.databay.co:8888';
const dispatcher = new EnvHttpProxyAgent();
const response = await fetch(
  'https://databay.com/what-is-my-ip/json',
  { dispatcher },
);
if (!response.ok) throw new Error(`HTTP ${response.status}`);
console.log(await response.json());

EnvHttpProxyAgent reads the conventional proxy environment variables. Confirm behavior in the pinned Undici version.

const browser = await chromium.launch({
  proxy: {
    server: 'http://gw.databay.co:8888',
    username: process.env.PROXY_USER ?? 'USERNAME',
    password: process.env.PROXY_PASSWORD ?? 'PASSWORD'
  }
});

Playwright keeps credentials in dedicated fields. Authenticated SOCKS support varies by browser engine.