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This package use to incorrectly build from source in the past. It now correctly builds from an archive of the source without needing dependencies like git.

Please report any user-agent related errors that stem from running recent versions of Chrome and Chromium upstream.

I think python-func_timeout needs to be added as a dependency, was getting

systemd[1]: Started FlareSolverr.
flaresolverr[28308]: Traceback (most recent call last):
flaresolverr[28308]:   File "/opt/flaresolverr/flaresolverr.py", line 13, in <module>
flaresolverr[28308]:     import flaresolverr_service
flaresolverr[28308]:   File "/opt/flaresolverr/flaresolverr_service.py", line 9, in <module>
flaresolverr[28308]:     from func_timeout import FunctionTimedOut, func_timeout
flaresolverr[28308]: ModuleNotFoundError: No module named 'func_timeout'

until I installed it.

Thanks @codicier. I pushed an update.

python-packaging should be added as a dependency. The undetected_chromedriver code that flaresolverr has included directly into their source depends on it.

The dependency was introduced on August 24th 2025 by this commit:

https://github.com/FlareSolverr/FlareSolverr/commit/ff74b50b6039f9edcabfbc628e0d237edea564e0#diff-ac34c6ed06b6e2639010ecff9e0169da5d9fcbff4e66058620877d39db9ba5caR4

The problem only happens with flaresolverr but not with flaresolverr-bin

Hi I'm facing the same build issue as @feedc0de, any ideas?

installed flaresolverr the first time and having problems launching it, any ideas?

systemd[1]: Started FlareSolverr.
flaresolverr[3248203]: 2025-02-25 15:29:45 INFO     FlareSolverr 3.3.21
flaresolverr[3248203]: 2025-02-25 15:29:45 INFO     Testing web browser installation...
flaresolverr[3248203]: 2025-02-25 15:29:45 INFO     Platform: Linux-6.13.2-arch1-1-x86_64-with-glibc2.41
flaresolverr[3248203]: 2025-02-25 15:29:45 INFO     Chrome / Chromium path: /usr/bin/chromium
flaresolverr[3248203]: 2025-02-25 15:29:45 INFO     Chrome / Chromium major version: 133
flaresolverr[3248203]: 2025-02-25 15:29:45 INFO     Launching web browser...
flaresolverr[3248203]: 2025-02-25 15:31:56 ERROR    Error starting Chrome: HTTPConnectionPool(host='localhost', port=40795): Read timed out. (read timeout=120)
flaresolverr[3248203]: Traceback (most recent call last):
flaresolverr[3248203]:   File "/opt/flaresolverr/utils.py", line 316, in get_user_agent
flaresolverr[3248203]:     driver = get_webdriver()
flaresolverr[3248203]:   File "/opt/flaresolverr/utils.py", line 203, in get_webdriver
flaresolverr[3248203]:     PATCHED_DRIVER_PATH = os.path.join(driver.patcher.data_path, driver.patcher.exe_name)
flaresolverr[3248203]:                                        ^^^^^^
flaresolverr[3248203]: UnboundLocalError: cannot access local variable 'driver' where it is not associated with a value
flaresolverr[3248203]: During handling of the above exception, another exception occurred:
flaresolverr[3248203]: Traceback (most recent call last):
flaresolverr[3248203]:   File "/opt/flaresolverr/flaresolverr.py", line 108, in <module>
flaresolverr[3248203]:     flaresolverr_service.test_browser_installation()
flaresolverr[3248203]:     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
flaresolverr[3248203]:   File "/opt/flaresolverr/flaresolverr_service.py", line 73, in test_browser_installation
flaresolverr[3248203]:     user_agent = utils.get_user_agent()
flaresolverr[3248203]:   File "/opt/flaresolverr/utils.py", line 322, in get_user_agent
flaresolverr[3248203]:     raise Exception("Error getting browser User-Agent. " + str(e))
flaresolverr[3248203]: Exception: Error getting browser User-Agent. cannot access local variable 'driver' where it is not associated with a value
flaresolverr[3248203]: Exception ignored in: <function Chrome.__del__ at 0x7732db751ee0>
flaresolverr[3248203]: Traceback (most recent call last):
flaresolverr[3248203]:   File "/opt/flaresolverr/undetected_chromedriver/__init__.py", line 858, in __del__
flaresolverr[3248203]:   File "/opt/flaresolverr/undetected_chromedriver/__init__.py", line 774, in quit
flaresolverr[3248203]:   File "/usr/lib/python3.13/site-packages/selenium/webdriver/common/service.py", line 160, in stop
flaresolverr[3248203]:   File "/usr/lib/python3.13/site-packages/selenium/webdriver/common/service.py", line 181, in _terminate_process
flaresolverr[3248203]:   File "/usr/lib/python3.13/subprocess.py", line 2227, in terminate
flaresolverr[3248203]: ImportError: sys.meta_path is None, Python is likely shutting down
systemd[1]: flaresolverr.service: Main process exited, code=exited, status=1/FAILURE
systemd[1]: flaresolverr.service: Failed with result 'exit-code'.
systemd[1]: flaresolverr.service: Consumed 4min 26.946s CPU time, 254.1M memory peak.

@txtsd

Chromium is set as a dependency for flaresolverr, roling back chromium to 126 resolved the issue. thanks!

@Sisco88 Try with Chrome instead of Chromium. This means you might have to uninstall Chromium. If everything fails, flaresolverr-bin works well.

EDIT: Chromium 126 is the last version that works with flaresolverr.

After update to the latest version, flaresolverr no longer starts and is stuck on "Launching web browser":

2024-11-17 14:38:22 INFO     FlareSolverr 3.3.21
2024-11-17 14:38:22 INFO     Testing web browser installation...
2024-11-17 14:38:22 INFO     Platform: Linux-6.11.8-arch1-2-x86_64-with-glibc2.40
2024-11-17 14:38:22 INFO     Chrome / Chromium path: /usr/bin/chromium
2024-11-17 14:38:22 INFO     Chrome / Chromium major version: 131
2024-11-17 14:38:22 INFO     Launching web browser...

This package use to incorrectly build from source in the past. It now correctly builds from an archive of the source without needing dependencies like git.

Please report any user-agent related errors that stem from running recent versions of Chrome and Chromium upstream.