Got it, let's cover different ways to capture that final redirected URL depending on your use case—whether you're working in the browser, a backend script, or just need to check manually:

If you need to fetch the final URL directly from a web page (to compare it against the browser's current URL), use the Fetch API with a HEAD request (it's more efficient than a full GET since we don't need the response body):

const initialUrl = 'http://cdn.amazon.com/picture/f184a6f7b9c4371cf962537ff384a362d97aa495044995079bca063aeb66d8c0';

fetch(initialUrl, {
  method: 'HEAD',
  redirect: 'follow' // Ensures we follow all redirects
})
.then(response => {
  const finalRedirectedUrl = response.url;
  console.log('Final URL after redirects:', finalRedirectedUrl);
  
  // Compare with the browser's current URL
  if (finalRedirectedUrl === window.location.href) {
    // Run your custom functionality here
    console.log('URLs match—executing your logic...');
  }
})
.catch(error => {
  console.error('Failed to fetch redirect info:', error);
});

If the page has already completed the redirect, you can simply grab the current URL directly with window.location.href—no extra fetch needed.

Using curl (quick command-line check) #

Run this command to get the final effective URL without downloading any content:

curl -Ls -o /dev/null -w "%{url_effective}" "http://cdn.amazon.com/picture/f184a6f7b9c4371cf962537ff384a362d97aa495044995079bca063aeb66d8c0"

• -L: Follows all redirects
• -s: Runs in silent mode (no progress output)
• -o /dev/null: Discards the response body
• -w "%{url_effective}": Prints the final URL after all redirects

Using Python (for backend automation) #

Use the requests library (it follows redirects by default):

import requests

initial_url = 'http://cdn.amazon.com/picture/f184a6f7b9c4371cf962537ff384a362d97aa495044995079bca063aeb66d8c0'

# Use HEAD request for efficiency
response = requests.head(initial_url, allow_redirects=True)
final_url = response.url

print(f"Final redirected URL: {final_url}")

# Compare with your target URL
target_url = 'http://cdn.amazon.com/picture/logo'
if final_url == target_url:
    # Execute your processing logic here
    print("Redirect matches target URL—processing...")

If you just need to verify the redirect manually:

• Open your browser's DevTools (press F12 or Ctrl+Shift+I)
• Go to the Network tab
• Check the Preserve log checkbox (so redirect requests aren't cleared)
• Enter the initial URL in the address bar and hit enter
• Look for the first request (with a 3xx status code like 301/302)
• Click that request, then check the Response Headers section—you'll see a Location field with the final redirected URL

内容的提问来源于stack exchange，提问作者user8842379