Extensions for Python HTTP libraries to support sending and receiving custom proxy headers during HTTPS CONNECT tunneling.

The Problem

When making HTTPS requests through a proxy, the connection is established via a CONNECT tunnel. During this process:

Sending headers to the proxy - Most Python HTTP libraries don't provide an easy way to send custom headers (like X-ProxyMesh-Country) to the proxy server during the CONNECT handshake.
Receiving headers from the proxy - The proxy's response headers from the CONNECT request are typically discarded, making it impossible to read custom headers (like X-ProxyMesh-IP) that the proxy sends back.

This library solves both problems for popular Python HTTP libraries.

Supported Libraries

Library	Module	Use Case
urllib3	`urllib3_proxy_manager`	Low-level HTTP client
requests	`requests_adapter`	Simple HTTP requests
aiohttp	`aiohttp_proxy`	Async HTTP client
httpx	`httpx_proxy`	Modern HTTP client
pycurl	`pycurl_proxy`	libcurl bindings
cloudscraper	`cloudscraper_proxy`	Cloudflare bypass
autoscraper	`autoscraper_proxy`	Automatic web scraping

Installation

pip install python-proxy-headers

Then install the HTTP library you want to use (e.g., pip install requests).

Note: This package has no dependencies by default - install only what you need.

Quick Start

requests

from python_proxy_headers.requests_adapter import ProxySession
with ProxySession(proxy_headers={'X-ProxyMesh-Country': 'US'}) as session:
    session.proxies = {'https': 'http://user:pass@proxy.example.com:8080'}
    response = session.get('https://httpbin.org/ip')
    # Proxy headers are merged into response.headers
    print(response.headers.get('X-ProxyMesh-IP'))

httpx

from python_proxy_headers.httpx_proxy import get
response = get(
    'https://httpbin.org/ip',
    proxy='http://user:pass@proxy.example.com:8080'
)
# Proxy CONNECT response headers are merged into response.headers
print(response.headers.get('X-ProxyMesh-IP'))

aiohttp

import asyncio
from python_proxy_headers.aiohttp_proxy import ProxyClientSession
async def main():
    async with ProxyClientSession() as session:
        async with session.get(
            'https://httpbin.org/ip',
            proxy='http://user:pass@proxy.example.com:8080'
        ) as response:
            # Proxy headers merged into response.headers
            print(response.headers.get('X-ProxyMesh-IP'))
asyncio.run(main())

pycurl (low-level)

import pycurl
from python_proxy_headers.pycurl_proxy import set_proxy_headers, HeaderCapture
c = pycurl.Curl()
c.setopt(pycurl.URL, 'https://httpbin.org/ip')
c.setopt(pycurl.PROXY, 'http://proxy.example.com:8080')
# Add these two lines to any existing pycurl code
set_proxy_headers(c, {'X-ProxyMesh-Country': 'US'})
capture = HeaderCapture(c)
c.perform()
print(capture.proxy_headers)  # Headers from proxy CONNECT response
c.close()

cloudscraper

from python_proxy_headers.cloudscraper_proxy import create_scraper
# Drop-in replacement for cloudscraper.create_scraper()
scraper = create_scraper(proxy_headers={'X-ProxyMesh-Country': 'US'})
scraper.proxies = {'https': 'http://proxy.example.com:8080'}
response = scraper.get('https://example.com')
# All CloudScraper features (Cloudflare bypass) preserved

Testing

A test harness is included to verify proxy header functionality:

# Set your proxy
export PROXY_URL='http://user:pass@proxy.example.com:8080'
# Test all modules
python test_proxy_headers.py
# Test specific modules
python test_proxy_headers.py requests httpx
# Verbose output (show header values)
python test_proxy_headers.py -v

Documentation

For detailed documentation, API reference, and more examples:

Full Documentation: python-proxy-headers.readthedocs.io
Example Code: proxy-examples for Python

Related Projects

scrapy-proxy-headers - Proxy header support for Scrapy

About

Created by ProxyMesh to help our customers use custom headers to control proxy behavior. Works with any proxy that supports custom headers.

License

MIT License