got the proxy error when using selenium-wire

[beibeiqi0916]

I am running the test suits by switching between selenium-wire and selenium, but looks like after the test cases triggered by selenium-wire completed, then the next url triggered by selenium is broken, say ERR_PROXY_CONNECTION_FAILED. I can see the last step in log for selenium-wire is 'INFO:seleniumwire.proxy.client:Destroying proxy', just guess that might be the reason. So are there any solutions I can check with?

[wkeeling]

Thanks for raising this. The driver instances should be independent of one another. Are you able to post the code that instantiates the selenium and selenium-wire webdrivers from your test?

[beibeiqi0916]

Sure, I pass the wire as the parameter, so

            if wire:

driver = CustomWireChrome(executable_path=settings.CHROMEDRIVER_PATH, chrome_options=chrome_profile, desired_capabilities=dc) else: driver = CustomChrome(executable_path=settings.CHROMEDRIVER_PATH, chrome_options=chrome_profile, desired_capabilities=dc)

and I define CustomWireChrome is separate class

from seleniumwire import webdriver as wiredriver class CustomWireChrome(WebDriverExtensions, wiredriver.Chrome): pass

[YourMan]

I got the same error on Chrome. Did you find a solution, by any chance?

[fantik11]

Same error in both Chrome and Firefox. Any solution?

[wkeeling]

I think the original issue is due to the two driver instances sharing the same desired_capabilities object (a dictionary). When the Selenium Wire instance CustomWireChrome is created, it modifies the desired capabilities by adding its internal proxy configuration to it. That means that the regular Selenium instance also receives this proxy configuration, but by the time that driver executes, the Selenium Wire proxy has disappeared and you see the error.

I'll look at fixing this in Selenium Wire so that the desired capabilities don't get "polluted" with this internal proxy config. In the meantime, it's probably a good idea to ensure that the two driver instances receive separate copies of the desired capabilities, rather than sharing the same instance. For example:

if wire:
    driver = CustomWireChrome(executable_path=settings.CHROMEDRIVER_PATH,
                          chrome_options=chrome_profile,
                          desired_capabilities=dict(dc))  # Use a copy
else:
    driver = CustomChrome(executable_path=settings.CHROMEDRIVER_PATH,
                          chrome_options=chrome_profile,
                          desired_capabilities=dc)

[wkeeling]

A copy of the desired capabilities is now made before it's used which eliminates side-effects caused by sharing. Available in v3.0.0 onwards.