[Bug]: playwright._impl._errors.Error: BrowserType.connect_over_cdp: WebSocket error: connect ECONNREFUSED about playwright

[pavelfeldman]

Try replacing

playwright.chromium.connect_over_cdp(("http://localhost:1234"))

with

playwright.chromium.connect_over_cdp(("http://127.0.0.1:1234"))

It sound like localhost resolves to ipv6 on your system.

[mxschmitt]

My guess is that

chrome_path = r'"C:\Program Files\Google\Chrome\Application\chrome.exe"'
debugging_port = "--remote-debugging-port=1234"

command = f"{chrome_path} {debugging_port}"
subprocess.Popen(command, shell=True)

is not working or not waiting long enough to Playwright to connect, so the server is not listening yet. Could you verify that?

[Louis24]

Try replacing

playwright.chromium.connect_over_cdp(("http://localhost:1234"))

with

playwright.chromium.connect_over_cdp(("http://127.0.0.1:1234"))

It sound like localhost resolves to ipv6 on your system.

Try replacing

playwright.chromium.connect_over_cdp(("http://localhost:1234"))

with

playwright.chromium.connect_over_cdp(("http://127.0.0.1:1234"))

It sound like localhost resolves to ipv6 on your system.

browser = playwright.chromium.connect_over_cdp("http://127.0.0.1:1234")

when I change to browser = playwright.chromium.connect_over_cdp("ws://127.0.0.1:1234")

[Louis24]

My guess is that

chrome_path = r'"C:\Program Files\Google\Chrome\Application\chrome.exe"'
debugging_port = "--remote-debugging-port=1234"

command = f"{chrome_path} {debugging_port}"
subprocess.Popen(command, shell=True)

is not working or not waiting long enough to Playwright to connect, so the server is not listening yet. Could you verify that?

sure, i'll try wait longer time. I have setting the time=10s, still error.
I guess a possible reason is that I use a vpn, is that cause the error?

[mxschmitt]

I had to modify it a little bit, since I'm on macOS, then it was working for me, note the --user-data-dir:

chrome_path = r'"/Applications/Google Chrome.app/Contents/MacOS/Google Chrome"'
debugging_port = "--remote-debugging-port=1234 --user-data-dir=foo"

command = f"{chrome_path} {debugging_port}"
subprocess.Popen(command, shell=True)

[Louis24]

I had to modify it a little bit, since I'm on macOS, then it was working for me, note the --user-data-dir:

chrome_path = r'"/Applications/Google Chrome.app/Contents/MacOS/Google Chrome"'
debugging_port = "--remote-debugging-port=1234 --user-data-dir=foo"

command = f"{chrome_path} {debugging_port}"
subprocess.Popen(command, shell=True)

thx, not working on windows.

Since YouTube has a security check mechanism and detected that the Playwright framework contained risks, I wondered if there was a possibility to let Playwright open the local browser and load local cookies and plug-ins, which would save the login step.

So I tried another method:

def run(playwright):
browser = playwright.chromium.launch_persistent_context(
user_data_dir=r"C:\Users\Louis\AppData\Local\Google\Chrome\User Data\Profile 1", # 设置用户数据目录
executable_path=r'C:\Program Files\Google\Chrome\Application\chrome.exe', # Chrome 可执行文件路径
accept_downloads=True, # 允许下载
headless=False, # 非无头模式，即显示浏览器界面
bypass_csp=True, # 绕过 Content Security Policy
slow_mo=10, # 减速执行，便于调试
args=[
'--disable-blink-features=AutomationControlled', # 禁用 Blink 功能控制
'--remote-debugging-port=1234', # 启用远程调试端口
'--in-process-plugins', # 插件在浏览器进程中运行
'--allow-outdated-plugins', # 允许使用过期插件
]
)
page = browser.new_page()
page.goto("https://www.baidu.com/")
print(page.title())
page.pause()

with sync_playwright() as playwright:
run(playwright)

The results is like this

Which I expect like this

is it possible to open a broswer with cache and plugin? and how about codegen using my own broswer?

[mxschmitt]

This doesn't look like and end-to-end testing use-case, so I'm going to close it for now. If you want to open an existing profile, see e.g. here or here.