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When I click a non-Facebook link in Facebook, it will be opened in new tab and be redirected to:

https://l.facebook.com/l.php?u=https%3A%2F%2Fexample-url-shortener.com%2Fslug%3Ffbclid%3D...&h=...&__tn__=...&c[0]=...

This intervenes the parameters of the actual link. I want to examine the redirect trace carefully.

The question How to track url redirects in the browser? doesn't seem to apply to this case, because:

  • 3rd party redirect inspector doesn't inject redirect like how Facebook does
  • Persists logs doesn't capture URL opened in a new tab
  • Firebug has become Firefox Developer Edition, and I don't think this task cannot be done with a regular browser

Do you have any idea?

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    Have you tried Fiddler?
    – Berend
    Commented Jun 23 at 12:54
  • 1
    For Firefox, there is the third-party add-on Link Redirect Trace, addons.mozilla.org/en-US/firefox/addon/… . That said, it "is not actively monitored for security by Mozilla. Make sure you trust it before installing."
    – DrMoishe Pippik
    Commented Jun 23 at 18:02
  • also note the difference between redirecting and rewriting. if you don't see a 30x response in the network tab, then it is likely that the url is being rewritten serverside instead of returning a 30x and letting the browser handle it client-side.
    – Frank Thomas
    Commented Jun 24 at 18:39
  • @FrankThomas I'm not sure what exactly server-side url rewriting does. Can you give an example? And why is it likely but not surely? Is there a case that the browser issuing a redirect without 30x response?
    – Ooker
    Commented Jun 25 at 6:07

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