Rotating and sticky proxies with Python requests — the username carries the targeting https://quanticdata.io/blog/how-to-use-a-proxy-with-python-requests/

qd_proxy_requests.py

"""Rotating vs sticky proxies with Python requests, and how to prove which you got.

    pip install requests
    export QD_PROXY_USER=... QD_PROXY_PASS=...
    python3 qd_proxy_requests.py

Targeting lives in the USERNAME — no custom headers, no extra API call:

    USER-country-us                          rotating US exit
    USER-country-de-city-berlin              city-level
    USER-country-gb-session-a91f-sessTime-30 one IP, held 30 minutes

No -session- means a NEW IP on every request. That is the default, and it is what
you want for scraping. Add a session only when a flow needs continuity.

https://quanticdata.io/residential-proxies/
Guide: https://quanticdata.io/blog/how-to-use-a-proxy-with-python-requests/
"""
import os
import secrets

import requests

GATEWAY = "pr.quanticdata.io:7777"
USER = os.environ["QD_PROXY_USER"]
PASS = os.environ["QD_PROXY_PASS"]
CHECK = "https://ipinfo.io/json"


def proxies(**bits) -> dict:
    parts = [USER]
    for key in ("country", "city", "session", "sessTime"):
        if bits.get(key):
            parts += [key, str(bits[key])]
    url = f"http://{'-'.join(parts)}:{PASS}@{GATEWAY}"
    return {"http": url, "https": url}


# Rotating: a different exit each time.
ips = [requests.get(CHECK, proxies=proxies(country="us"), timeout=30).json()["ip"]
       for _ in range(3)]
print(f"rotating  {len(set(ips))} distinct over 3: {ips}")

# Sticky: one exit for the whole flow — required for carts, logins and queues.
token = secrets.token_hex(3)
with requests.Session() as s:
    s.proxies = proxies(country="de", session=token, sessTime=10)
    stuck = {s.get(CHECK, timeout=30).json()["ip"] for _ in range(3)}
print(f"sticky {token}  {stuck}  <- one entry means it is working")

# Common trap: leaving a session token in a "rotating" scraper. If your rotation
# test returns the same IP every time, look at the username before the network.