How to Get Long Url from Short Url

Get long url from any short or redirect url

you don't need a library to do that, you can simply use XMLHttpRequest.

i created a snack : snack,

but only work with redirect URL not shorted ones like : shorturl.at/egzG4

Hope this helps you.

Get full url from shorten url using python

First method

As suggested, one way to accomplish the task would be to use the official api to bitly, which has, however, limitations (e.g., no more than 15 shortUrl's per request).

Second method

As an alternative, one could just avoid getting the contents, e.g. by using the HEAD HTTP method instead of GET. Here is just a sample code, which makes use of the excellent requests package:

import requests

l=['bit.ly/1bdDlXc','bit.ly/1bdDlXc',.......,'bit.ly/1bdDlXc']

for i in l:
    print requests.head("http://"+i).headers['location']

How to get a long url from a short url

Do a HEAD and look for the Location header.

% telnet bit.ly 80
Trying 168.143.173.13...
Connected to bit.ly.
Escape character is '^]'.
HEAD /cwz5Jd HTTP/1.1
Host: bit.ly

HTTP/1.1 301 Moved
Server: nginx/0.7.42
Date: Fri, 12 Mar 2010 18:37:46 GMT
Content-Type: text/html; charset=utf-8
Connection: keep-alive
Set-Cookie: _bit=4b9a89fa-002bd-030af-baa08fa8;domain=.bit.ly;expires=Wed Sep  8 14:37:46 2010;path=/; HttpOnly
Location: http://www.engadget.com/2010/03/12/motorola-milestone-with-android-2-1-hitting-bulgaria-by-march-20/?utm_source=twitterfeed&utm_medium=twitter
MIME-Version: 1.0
Content-Length: 404

Google URL Shortener API: Converting a long URL to short

Finally found the solution.

Instead of adding key as a post param, appended it to the URL itself. like

https://www.googleapis.com/urlshortener/v1/url?key={API_KEY}

and it worked as expected.

Simplest way to get a long URL for a shortened URL in Cocoa?

UPDATE: I just saw your comment and realised it's following the redirect.

See the delegate method: connection:willSendRequest:redirectResponse:, which tells you it's doing a redirect to this new request, based on the previous response.

You can get the expanded URL either from the new request here, or from the Location header of the redirect response.

Discussion If the delegate wishes to
cancel the redirect, it should call
the connection object’s cancel method.
Alternatively, the delegate method can
return nil to cancel the redirect, and
the connection will continue to
process. This has special relevance in
the case where redirectResponse is not
nil. In this case, any data that is
loaded for the connection will be sent
to the delegate, and the delegate will
receive a connectionDidFinishLoading
or connection:didFailLoadingWithError:
message, as appropriate.

Original answer follows...

Use NSURLConnection with a delegate. In your delegate's connection:didReceiveResponse: method, fetch allHeaderFields and read the value of the "Location" header.

Something like:

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    NSLog(@"Expanded URL = %@", [[(NSHTTPURLResponse *)response allHeaderFields] objectForKey:@"Location"]);
}

I'd create a little URLExpander class to do this personally, with a signature something like:

+(void)asyncExpandURL:(NSURL *)aURL didExpandTarget:(id)target selector:(SEL)selector;

Then just pass back two arguments in your message, one for the short URL, one for the long.

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