Hey there, let's work through this proxy initialization issue you're facing with Chrome WebDriver. Based on the code snippet and partial error stack you shared, here's a breakdown of likely problems and actionable fixes:

First, Let's Recap Your Setup #

Your code attempt:

driver = webdriver.Chrome(chrome_options=chrome_options, executable_path='/usr/lib/chromium-browser/chromedriver')

Partial error trace:

File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/chrome/webdriver.py", line 75, in init
desired_capabilities=desired_capabilities)
File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 154, in __...

Common Causes & Fixes #

1. Incorrect Proxy Configuration in ChromeOptions #

Older versions of Selenium (especially those compatible with Python 2.7) require specific syntax for proxy settings. If you didn't properly format the proxy argument, this will trigger initialization failures.

Fix: Ensure your proxy is configured with the correct protocol and format:

from selenium import webdriver
from selenium.webdriver.chrome.options import Options

# Initialize ChromeOptions correctly
chrome_options = Options()

# Replace with your actual proxy details (include http/https protocol!)
chrome_options.add_argument('--proxy-server=http://your_proxy_address:your_proxy_port')

2. ChromeDriver & Chrome Browser Version Mismatch #

This is one of the most frequent causes of initialization errors. Your Chromium browser and Chromedriver must be version-compatible (usually within 1-2 major versions).

Fix:

• Check your Chromedriver version:

  /usr/lib/chromium-browser/chromedriver --version
  

• Check your Chromium browser version:

  chromium-browser --version
  

• If versions don't align, download the matching Chromedriver for your browser version.

3. Incorrect Executable Path or Permissions #

If the Chromedriver path is wrong, or the file lacks execution permissions, the driver won't launch.

Fix:

• Verify the path exists:

  ls -l /usr/lib/chromium-browser/chromedriver
  

• Add execution permissions if missing:

  sudo chmod +x /usr/lib/chromium-browser/chromedriver
  

4. Deprecated chrome_options Parameter #

In some older Selenium versions, the chrome_options parameter was renamed to options. Try swapping the parameter name:

Fix:

driver = webdriver.Chrome(options=chrome_options, executable_path='/usr/lib/chromium-browser/chromedriver')

5. Proxy Authentication (Tricky for Old Versions) #

If your proxy requires a username and password, older ChromeDriver versions can't handle this via add_argument. You'll need to create a simple Chrome extension to inject auth credentials.

Quick Fix for Auth:

1. Create a file named proxy_auth.zip containing two files:
   • manifest.json:

     {
       "version": "1.0.0",
       "manifest_version": 2,
       "name": "Chrome Proxy Auth",
       "permissions": ["proxy", "tabs", "unlimitedStorage", "storage", "<all_urls>"],
       "background": {
         "scripts": ["background.js"]
       }
     }
     

   • background.js:

     chrome.proxy.settings.set({value: {mode: "fixed_servers", rules: {singleProxy: {scheme: "http", host: "YOUR_PROXY_IP", port: YOUR_PROXY_PORT}}}, scope: "regular"}, function() {});
     
     chrome.webRequest.onAuthRequired.addListener(
       function(details) {
         return {
           authCredentials: {username: "YOUR_USERNAME", password: "YOUR_PASSWORD"}
         };
       },
       {urls: ["<all_urls>"]},
       ["blocking"]
     );
     

2. Load the extension in your ChromeOptions:

   chrome_options.add_extension('proxy_auth.zip')
   

Troubleshooting Step to Isolate the Issue #

First, try initializing the driver without proxy settings to confirm the core driver works:

driver = webdriver.Chrome(executable_path='/usr/lib/chromium-browser/chromedriver')
driver.get("https://google.com")

If this works, the problem is definitely tied to your proxy configuration.

内容的提问来源于stack exchange，提问作者Dip Deb