[🐛 Bug]: [py] get_log() doesn't work with Firefox

[cgoldberg]

Description

Calling the driver.get_log() method when using Firefox doesn't work and returns an error.

Reproducible Code

from selenium import webdriver

driver = webdriver.Firefox()
print(driver.get_log('browser'))

Debugging Logs

DEBUG:selenium.webdriver.common.selenium_manager:Selenium Manager binary found at: /home/cgoldberg617/code/selenium/py/selenium/webdriver/common/linux/selenium-manager
DEBUG:selenium.webdriver.common.selenium_manager:Executing process: /home/cgoldberg617/code/selenium/py/selenium/webdriver/common/linux/selenium-manager --browser firefox --debug --language-binding python --output json
DEBUG:selenium.webdriver.common.selenium_manager:geckodriver not found in PATH
DEBUG:selenium.webdriver.common.selenium_manager:firefox not found in PATH
DEBUG:selenium.webdriver.common.selenium_manager:firefox not found in the system
DEBUG:selenium.webdriver.common.selenium_manager:Required browser: firefox 137.0
DEBUG:selenium.webdriver.common.selenium_manager:firefox 137.0 already exists
DEBUG:selenium.webdriver.common.selenium_manager:firefox 137.0 is available at /home/cgoldberg617/.cache/selenium/firefox/linux64/137.0/firefox
DEBUG:selenium.webdriver.common.selenium_manager:Required driver: geckodriver 0.36.0
DEBUG:selenium.webdriver.common.selenium_manager:geckodriver 0.36.0 already in the cache
DEBUG:selenium.webdriver.common.selenium_manager:Driver path: /home/cgoldberg617/.cache/selenium/geckodriver/linux64/0.36.0/geckodriver
DEBUG:selenium.webdriver.common.selenium_manager:Browser path: /home/cgoldberg617/.cache/selenium/firefox/linux64/137.0/firefox
DEBUG:selenium.webdriver.common.service:Started executable: `/home/cgoldberg617/.cache/selenium/geckodriver/linux64/0.36.0/geckodriver` in a child process with pid: 14822 using 0 to output -3
DEBUG:selenium.webdriver.remote.remote_connection:POST http://localhost:60911/session {'capabilities': {'firstMatch': [{}], 'alwaysMatch': {'browserName': 'firefox', 'acceptInsecureCerts': True, 'moz:debuggerAddress': True, 'pageLoadStrategy': <PageLoadStrategy.normal: 'normal'>, 'browserVersion': None, 'moz:firefoxOptions': {'binary': '/home/cgoldberg617/.cache/selenium/firefox/linux64/137.0/firefox', 'prefs': {'remote.active-protocols': 3}}}}}
DEBUG:urllib3.connectionpool:Starting new HTTP connection (1): localhost:60911
DEBUG:urllib3.connectionpool:http://localhost:60911 "POST /session HTTP/1.1" 200 0
DEBUG:selenium.webdriver.remote.remote_connection:Remote response: status=200 | data={"value":{"sessionId":"96ed6e1f-9fe9-475e-8d46-5e5726273c6b","capabilities":{"acceptInsecureCerts":true,"browserName":"firefox","browserVersion":"137.0","moz:accessibilityChecks":false,"moz:buildID":"20250327043313","moz:debuggerAddress":"127.0.0.1:48015","moz:geckodriverVersion":"0.36.0","moz:headless":false,"moz:platformVersion":"6.6.67-06628-g571b599e617d","moz:processID":14825,"moz:profile":"/tmp/rust_mozprofile4fOCFz","moz:shutdownTimeout":60000,"moz:webdriverClick":true,"moz:windowless":false,"pageLoadStrategy":"normal","platformName":"linux","proxy":{},"setWindowRect":true,"strictFileInteractability":false,"timeouts":{"implicit":0,"pageLoad":300000,"script":30000},"unhandledPromptBehavior":"dismiss and notify","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:137.0) Gecko/20100101 Firefox/137.0"}}} | headers=HTTPHeaderDict({'content-type': 'application/json; charset=utf-8', 'cache-control': 'no-cache', 'content-length': '814', 'date': 'Mon, 07 Apr 2025 17:11:33 GMT'})
DEBUG:selenium.webdriver.remote.remote_connection:Finished Request
DEBUG:selenium.webdriver.remote.remote_connection:POST http://localhost:60911/session/96ed6e1f-9fe9-475e-8d46-5e5726273c6b/se/log {'type': 'browser'}
DEBUG:urllib3.connectionpool:http://localhost:60911 "POST /session/96ed6e1f-9fe9-475e-8d46-5e5726273c6b/se/log HTTP/1.1" 405 0
DEBUG:selenium.webdriver.remote.remote_connection:Remote response: status=405 | data=HTTP method not allowed | headers=HTTPHeaderDict({'content-type': 'text/plain; charset=utf-8', 'content-length': '23', 'date': 'Mon, 07 Apr 2025 17:11:37 GMT'})
DEBUG:selenium.webdriver.remote.remote_connection:Finished Request
Traceback (most recent call last):
  File "/home/cgoldberg617/code/selenium/py/sel.py", line 21, in <module>
    print(driver.get_log('browser'))
          ~~~~~~~~~~~~~~^^^^^^^^^^^
  File "/home/cgoldberg617/code/selenium/py/selenium/webdriver/remote/webdriver.py", line 1192, in get_log
    return self.execute(Command.GET_LOG, {"type": log_type})["value"]
           ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/cgoldberg617/code/selenium/py/selenium/webdriver/remote/webdriver.py", line 429, in execute
    self.error_handler.check_response(response)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^
  File "/home/cgoldberg617/code/selenium/py/selenium/webdriver/remote/errorhandler.py", line 196, in check_response
    raise exception_class(value)
selenium.common.exceptions.WebDriverException: Message: HTTP method not allowed

[selenium-ci]

@cgoldberg, thank you for creating this issue. We will troubleshoot it as soon as we can.

Selenium Triage Team: remember to follow the Triage Guide

[titusfortner]

Yeah, Selenium no longer has its own logging API; I think it's been removed in all the other bindings (e.g., 8747489)

The action here is to deprecate and/or remove the method and use the Chrome specific logging mechanism for dealing with Chrome logs

[selenium-ci]

This issue is looking for contributors.

Please comment below or reach out to us through our IRC/Slack/Matrix channels if you are interested.

[cgoldberg]

I can work on this.

So do we want to remove all the commands that access the /session/$sessionId/se/log endpoint, and everything that accesses them? (Firefox doesn't even respond to that endpoint as described in this bug... Chrome does, but I don't know if it returns anything useful).

[cgoldberg]

And do I need to deprecate everything for future removal, or can I just remove it? I don't think it makes sense to deprecate it if it doesn't even currently work.

[cgoldberg]

This removes it: #15641

[cortlepp]

I don't know whether this was intended, but this change breaks accesses to the log of remote chromium browsers (see also the references on you PR after this change was released) @cgoldberg .

[cgoldberg]

I'll take a look... Thanks.