Скачать или смотреть Resolving the urllib3.exceptions.ProxySchemeUnknown Error in Selenium WebDriver

Learn how to troubleshoot the `urllib3.exceptions.ProxySchemeUnknown` error in Selenium WebDriver, including understanding the proxy configuration and solutions.
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This video is based on the question https://stackoverflow.com/q/69612639/ asked by the user 'Saeed' ( https://stackoverflow.com/u/17176965/ ) and on the answer https://stackoverflow.com/a/69614067/ provided by the user 'Alexey R.' ( https://stackoverflow.com/u/8343843/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting the urllib3.exceptions.ProxySchemeUnknown Error in Selenium WebDriver

If you're diving into Python web automation with Selenium, you might encounter some hurdles along the way. One such obstacle is the error message:

[[See Video to Reveal this Text or Code Snippet]]

This error can be intimidating, especially for newcomers. However, understanding its cause and how to resolve it can help you return to writing your automation scripts successfully. In this guide, we will explain what triggers this error and provide you with clear steps to fix it.

Understanding the Error

When you run a simple Selenium script like the following:

[[See Video to Reveal this Text or Code Snippet]]

you may encounter a traceback leading to the error identifier above. This issue generally arises when your WebDriver tries to communicate with a service, but the proxy configuration is incorrect.

What Causes the Error?

The essence of the error lies in the way your system handles proxy URLs. When your Selenium script initiates a connection, it checks the proxy settings, typically stored in environment variables. The function that retrieves these proxies is designed to look specifically for http:// or https:// in the URL. If the URL is missing a scheme, it will throw the ProxySchemeUnknown error.

Key Takeaway

The WebDriver is unable to recognize the specified proxy URL due to a missing or malformed URL scheme.

Steps to Fix the Error

Here are two effective methods for resolving this error:

Method 1: Correct the Proxy URL

Check Environment Variables: Make sure to investigate your http_proxy and https_proxy environment variables. You can view these in your terminal:

For Linux/macOS: Use echo $http_proxy or echo $https_proxy.

For Windows: Use echo %http_proxy% or echo %https_proxy% in Command Prompt.

Set/Update Proxy: If the variables do not contain proper URLs (including the necessary scheme), either correct them to valid URLs or set them if they're not defined. Example of a proper URL configuration:

http_proxy=http://your_proxy_host:port

https_proxy=https://your_proxy_host:port

Method 2: Disable Proxy Environment Variables in Firefox

If you're not relying on a proxy at all, a simpler solution may be to ignore the local proxy settings when initiating the Firefox WebDriver. You can do this by adjusting the FirefoxOptions in your script:

[[See Video to Reveal this Text or Code Snippet]]

Enabling this option tells the WebDriver to ignore any local proxy configurations, thus preventing the error from occurring.

Conclusion

Encountering the urllib3.exceptions.ProxySchemeUnknown error can be frustrating, but with a better understanding of proxy settings and the right steps to rectify them, you can quickly solve the problem and continue using Selenium in your Python projects. Ensure that your proxy settings are correct or properly ignore them if not needed. Happy coding!