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

  • By
    5 More HTML5 APIs You Didn’t Know Existed

    The HTML5 revolution has provided us some awesome JavaScript and HTML APIs.  Some are APIs we knew we've needed for years, others are cutting edge mobile and desktop helpers.  Regardless of API strength or purpose, anything to help us better do our job is a...

  • By
    Being a Dev Dad

    I get asked loads of questions every day but I'm always surprised that they're rarely questions about code or even tech -- many of the questions I get are more about non-dev stuff like what my office is like, what software I use, and oftentimes...

Incredible Demos

  • By
    dwClickable:  Entire Block Clickable Using MooTools 1.2

    I recently received an email from a reader who was really impressed with Block Clickable, a jQuery script that took the link within a list item and made the entire list item clickable. I thought it was a neat script so I...

  • By
    CSS Sprites

    The idea of CSS sprites is pretty genius. For those of you who don't know the idea of a sprite, a sprite is basically multiple graphics compiled into one image. The advantages of using sprites are: Fewer images for the browser to download, which means...

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!