How can Playwright send the Proxy-Authorization while using Chromium?

I have a proxy server that requires a username and password to access (e.g., 127.0.0.1:8000, username: abcdef, password: 123456).

When I use Playwright to access a destination website through this proxy, the proxy server receives a blank Proxy-Authorization header, and the website cannot be accessed because the proxy authentication fails. According to the Playwright documentation said it support proxy authentication, proxy authentication should be supported.

Interestingly, when I test with WebKit, proxy authentication works as expected, but it does not work with Chromium.

Has anyone encountered this issue or knows how to resolve it? Is there a workaround to get proxy authentication working with Playwright and Chromium?

Thank you for your help!

my test code is:

from playwright.sync_api import sync_playwright
import subprocess
import os

# My Proxy
server = "http://127.0.0.1:8000"
password = "abcdef"
username = "123456"

dst_url="http://httpbin.org/ip"

def test_webkit_proxy():
    print("=== Solution1: use WebKit ===")
    with sync_playwright() as p:
        browser = p.webkit.launch()
        context = browser.new_context(
            proxy={
                "server": server,
                "username": username,
                "password": password
            }
        )
        page = context.new_page()
        try:
            response = page.goto(dst_url, timeout=30000)
            if response.status == 200:
                print(f"✅ WebKit success: {response.status}")
            else:
                print(f"❌ WebKit fail: {response.status}")
            print(f"response body: {response.text()}")
        except Exception as e:
            print(f"❌ WebKit fail: {e}")
        finally:
            browser.close()

def test_chromium_standard():
    print("=== Solution2: use Chromium standard ===")
    with sync_playwright() as p:
        browser = p.chromium.launch()
        context = browser.new_context(
            proxy={
                "server": server,
                "username": username,
                "password": password
            }
        )
        page = context.new_page()
        try:
            response = page.goto(dst_url, timeout=30000)
            if response.status == 200:
                print(f"✅ Chromium standard success: {response.status}")
            else:
                print(f"❌ Chromium standard fail: {response.status}")
            print(f"response body: {response.text()}")
        except Exception as e:
            print(f"❌ Chromium standard fail: {e}")
        finally:
            browser.close()

if __name__ == "__main__":
    test_webkit_proxy()
    test_chromium_standard()

I want to use the Playwright Python library with Chromium in a way that supports proxy authentication.