Get Redirect URL with cURL

By  on  

URL redirects can be glorious or annoying depending on which side of them you are on and which side you want to be on.  Redirects are helpful for vanity URLs (useful in advertising) but sometimes they're annoying in that they could potentially break your code if you encounter a redirect you weren't anticipating.

The useful and amazing cURL command line utility allows you to fetch an address and return its final destination URL:

# "/css" doesn't exist but WordPress tries to find the closest match
# and then redirects to it ("/css-animation-callback")

curl -Ls -w %{url_effective} -o /dev/null https://davidwalsh.name/css

# Outputs: https://davidwalsh.name/css-animation-callback

The url_effective variable is what we're after.  The L directive tells cURL to follow redirects, the s directive tells cURL to be silent (i.e. not output the page contents).  You provide the URL, cURL follows it to its endpoint -- easy!

Recent Features

Incredible Demos

  • By
    Pure CSS Slide Up and Slide Down

    If I can avoid using JavaScript for element animations, I'm incredibly happy and driven to do so.  They're more efficient, don't require a JavaScript framework to manage steps, and they're more elegant.  One effect that is difficult to nail down with pure CSS is sliding up...

  • By
    iPhone-Style Passwords Using MooTools PassShark

    Every once in a while I come across a plugin that blows me out of the water and the most recent culprit is PassShark: a MooTools plugin that duplicates the iPhone's method of showing/hiding the last character in a password field. This gem of...

Discussion

  1. J-K. Solbakken

    Follow a URL using JavaScript: https://www.npmjs.com/package/linkfollower

Wrap your code in <pre class="{language}"></pre> tags, link to a GitHub gist, JSFiddle fiddle, or CodePen pen to embed!