I need to get the final URL after a page redirect preferably with curl or wget.
For example http://google.com may redirect to http://www.google.com.
The contents are easy to get(ex. curl --max-redirs 10 http://google.com -L), but I'm only interested in the final url (in the former case http://www.google.com).
Is there any way of doing this by using only Linux built-in tools? (command line only)
curl's -w option and the sub variable url_effective is what you are
looking for.
Something like
curl -Ls -o /dev/null -w %{url_effective} http://google.com
More info
-L Follow redirects -s Silent mode. Don't output anything -o FILE Write output to <file> instead of stdout -w FORMAT What to output after completion
More
You might want to add -I (that is an uppercase i) as well, which will make the command not download any "body", but it then also uses the HEAD method, which is not what the question included and risk changing what the server does. Sometimes servers don't respond well to HEAD even when they respond fine to GET.
curl can only follow http redirects. To also follow meta refresh directives and javascript redirects, you need a full-blown browser like headless chrome:
#!/bin/bash
real_url () {
printf 'location.href\nquit\n' | \
chromium-browser --headless --disable-gpu --disable-software-rasterizer \
--disable-dev-shm-usage --no-sandbox --repl "$@" 2> /dev/null \
| tr -d '>>> ' | jq -r '.result.value'
}
If you don't have chrome installed, you can use it from a docker container:
#!/bin/bash
real_url () {
printf 'location.href\nquit\n' | \
docker run -i --rm --user "$(id -u "$USER")" --volume "$(pwd)":/usr/src/app \
zenika/alpine-chrome --no-sandbox --repl "$@" 2> /dev/null \
| tr -d '>>> ' | jq -r '.result.value'
}
Like so:
$ real_url http://dx.doi.org/10.1016/j.pgeola.2020.06.005
https://www.sciencedirect.com/science/article/abs/pii/S0016787820300638?via%3Dihub
I'm not sure how to do it with curl, but libwww-perl installs the GET alias.
$ GET -S -d -e http://google.com
GET http://google.com --> 301 Moved Permanently
GET http://www.google.com/ --> 302 Found
GET http://www.google.ca/ --> 200 OK
Cache-Control: private, max-age=0
Connection: close
Date: Sat, 19 Jun 2010 04:11:01 GMT
Server: gws
Content-Type: text/html; charset=ISO-8859-1
Expires: -1
Client-Date: Sat, 19 Jun 2010 04:11:01 GMT
Client-Peer: 74.125.155.105:80
Client-Response-Num: 1
Set-Cookie: PREF=ID=a1925ca9f8af11b9:TM=1276920661:LM=1276920661:S=ULFrHqOiFDDzDVFB; expires=Mon, 18-Jun-2012 04:11:01 GMT; path=/; domain=.google.ca
Title: Google
X-XSS-Protection: 1; mode=block
Thanks, that helped me. I made some improvements and wrapped that in a helper script "finalurl":
#!/bin/bash
curl $1 -s -L -I -o /dev/null -w '%{url_effective}'
-o output to /dev/null-I don't actually download, just discover the final URL-s silent mode, no progressbarsThis made it possible to call the command from other scripts like this:
echo `finalurl http://someurl/`
You can do this with wget usually. wget --content-disposition "url" additionally if you add -O /dev/null you will not be actually saving the file.
wget -O /dev/null --content-disposition example.com
This would work:
curl -I somesite.com | perl -n -e '/^Location: (.*)$/ && print "$1\n"'
Thank you. I ended up implementing your suggestions: curl -i + grep
curl -i http://google.com -L | egrep -A 10 '301 Moved Permanently|302 Found' | grep 'Location' | awk -F': ' '{print $2}' | tail -1
Returns blank if the website doesn't redirect, but that's good enough for me as it works on consecutive redirections.
Could be buggy, but at a glance it works ok.
as another option:
$ curl -i http://google.com
HTTP/1.1 301 Moved Permanently
Location: http://www.google.com/
Content-Type: text/html; charset=UTF-8
Date: Sat, 19 Jun 2010 04:15:10 GMT
Expires: Mon, 19 Jul 2010 04:15:10 GMT
Cache-Control: public, max-age=2592000
Server: gws
Content-Length: 219
X-XSS-Protection: 1; mode=block
<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">
<TITLE>301 Moved</TITLE></HEAD><BODY>
<H1>301 Moved</H1>
The document has moved
<A HREF="http://www.google.com/">here</A>.
</BODY></HTML>
But it doesn't go past the first one.
The parameters -L (--location) and -I (--head) still doing unnecessary HEAD-request to the location-url.
If you are sure that you will have no more than one redirect, it is better to disable follow location and use a curl-variable %{redirect_url}.
This code do only one HEAD-request to the specified URL and takes redirect_url from location-header:
curl --head --silent --write-out "%{redirect_url}\n" --output /dev/null "https://""goo.gl/QeJeQ4"
all_videos_link.txt - 50 links of goo.gl+bit.ly which redirect to youtube
time while read -r line; do
curl -kIsL -w "%{url_effective}\n" -o /dev/null $line
done < all_videos_link.txt
Results:
real 1m40.832s
user 0m9.266s
sys 0m15.375s
time while read -r line; do
curl -kIs -w "%{redirect_url}\n" -o /dev/null $line
done < all_videos_link.txt
Results:
real 0m51.037s
user 0m5.297s
sys 0m8.094s
You could use grep. doesn't wget tell you where it's redirecting too? Just grep that out.
Can you try with it?
#!/bin/bash
LOCATION=`curl -I 'http://your-domain.com/url/redirect?r=something&a=values-VALUES_FILES&e=zip' | perl -n -e '/^Location: (.*)$/ && print "$1\n"'`
echo "$LOCATION"
Note: when you execute the command curl -I http://your-domain.com have to use single quotes in the command like curl -I 'http://your-domain.com'
Source: Stackoverflow.com