Fixed web socket endpoint for Chrome CDP (Chrome DevTools Protocol) - google-chrome

Question

I use Chrome CDP for some tasks automation.
One have to first start the chrome with CDP:
chromium-browser --remote-debugging-port=9222
and it reports something like
DevTools listening on ws://127.0.0.1:9222/devtools/browser/3e3152c6-20fc-4cea-a9d2-60e4e6b8ad70
I have to copy the ws://... URL to my config file manually to be able to proceed with my task. I probably can work around this using python's subprocess.Popen to do this instead and extract the URL but isn't there a way how to make this URL configurable or at least fixed?

Answer 1

Thanks to wOxxOm! It really can be read from http://127.0.0.1:9222/json/version (Documentation)
As an alternative, I wrote Python script to launch it and get the endpoint as well:
from subprocess import Popen, PIPE
class Browser:
BANNER = "DevTools listening on "
def __init__(self, path="/usr/bin/chromium-browser",
port=9222, ignore_tls_errors=False):
cmd = [path, f"--remote-debugging-port={port}"]
if ignore_tls_errors:
cmd.append("--ignore-certificate-errors")
self.process = Popen(cmd, stdout=PIPE, stderr=PIPE, universal_newlines=True)
output = ""
for line in self.process.stderr:
output += line
if self.BANNER in output:
start_pos = output.find(self.BANNER) + len(self.BANNER)
end_pos = output.find("\n", start_pos)
self.url = output[start_pos:end_pos]
break
def close(self):
self.process.terminate()
if __name__ == "__main__":
try:
b = Browser()
print("URL:", b.url)
finally:
b.close()