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I have to build an web application on a linux webserver that will use selenium with firefox . When I run the application the the linux server "localhost:5000" it works perfectly fine . But when i tried it with "127.0.0.1:80" it is not giving me an error during webdriver loading:

driver = webdriver.Firefox(executable_path='/usr/local/bin/geckodriver')

Error:

"Message: Unable to find a matching set of capabilities"

In nginx access.log it is producing a http 200 and there is nothing on error.log in geckodriver.log it produce:

Listening on port 41209

Environment details:

  • selenium = 3.8.0
  • geckodriver = 0.18.0
  • Firefox version 53
  • python = 3.6

nginx imageApp.conf

server { listen 80; server_name 127.0.0.1; location / { include proxy_params; proxy_pass http://unix:/home/administator/imageDetectionApplication/imageDetectionApplication.sock; } }

imageDetectionApplication.service

I am completely new in linux server...!!

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1 Answer 1

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This error message...

Message: Unable to find a matching set of capabilities

...implies that the GeckoDriver was unable to initiate/spawn a new Browsing Context i.e. Firefox Browser session.

Your main issue is the incompatibility between the version of the binaries you are using as follows:

  • Your Selenium Client version is 3.8.0 which is almost 2.5 years older.
  • Your JDK version is unknown to us.
  • Your GeckoDriver version is 0.18.0 which is older.
  • Your Firefox version is 53 which is also pretty old.

So there is a clear mismatch between the Selenium Client v3.8.0 , GeckoDriver v0.18.0 and the Firefox Browser v53

Solution

Ensure that:

  • JDK is upgraded to current levels JDK 8u251.
  • Selenium is upgraded to current levels Version 3.141.59.
  • GeckoDriver is upgraded to GeckoDriver v0.26.0 level.
  • Firefox is upgraded to current Firefox v72.0 levels.
  • GeckoDriver is present in the desired location.
  • GeckoDriver is having executable permission for non-root users.
  • Clean your Project Workspace through your IDE and Rebuild your project with required dependencies only.
  • If your base Web Client version is too old, then uninstall it install a recent GA and released version of Web Client.
  • Take a System Reboot.
  • Execute your Test as a non-root user.
  • Always invoke driver.quit() within tearDown(){} method to close & destroy the WebDriver and Web Client instances gracefully.

References

You can find a couple of relevant discussions in:

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3 Comments

thanks for your reply . Unfortunately I am out of office till sunday . I will revert to the updated system on monday and let you know the result.
DebanjanB ..... I have updated the latest 1)selenium->3.141 2) Firefox->72 and 3)geckodriver->0.26.0....... then I put the geckodriver on /usr/local/bin and made it executable............... now the error is 'geckodriver' executable needs to be in PATH.
@raymax Great. So the current issue is solved. 'geckodriver' executable needs to be in PATH seems to be a new error. Can you raise a new question as per your new requirement please?

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