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    <p>You DO have to open it, otherwise you won't know what URL it will redirect to. As Greg put it:</p> <blockquote> <p>A short link is a key into somebody else's database; you can't expand the link without querying the database</p> </blockquote> <p>Now to your question.</p> <blockquote> <p>Does anyone know of a more efficient way to complete this operation without using open (since it is a waste of bandwidth)?</p> </blockquote> <p>The more efficient way is to not close the connection, keep it open in the background, by using HTTP's <code>Connection: keep-alive</code>.</p> <p>After a small test, unshorten.me seems to take the <code>HEAD</code> method into account and doing a redirect to itself:</p> <pre><code>&gt; telnet unshorten.me 80 Trying 64.202.189.170... Connected to unshorten.me. Escape character is '^]'. HEAD http://unshort.me/index.php?r=http%3A%2F%2Fbit.ly%2FcXEInp HTTP/1.1 Host: unshorten.me HTTP/1.1 301 Moved Permanently Date: Mon, 22 Aug 2011 20:42:46 GMT Server: Microsoft-IIS/6.0 X-Powered-By: ASP.NET X-AspNet-Version: 2.0.50727 Location: http://resolves.me/index.php?r=http%3A%2F%2Fbit.ly%2FcXEInp Cache-Control: private Content-Length: 0 </code></pre> <p>So if you use the <code>HEAD</code> HTTP method, instead of <code>GET</code>, <strong>you will actually end up doing the same work twice</strong>.</p> <p>Instead, you should keep the connection alive, which will save you only a little bandwidth, but what it <strong>will</strong> certainly save is the <strong>latency</strong> of establishing a new connection every time. Establishing a TCP/IP connection is <strong>expensive</strong>.</p> <p>You should get away with a number of kept-alive connections to the unshorten service equal to the number of concurrent connections your own service receives.</p> <p>You could manage these connections in a pool. That's the closest you can get. Beside <a href="http://systembash.com/content/tweaking-tcp-for-fast-100mbps-connections-and-transfers-on-linux/" rel="nofollow">tweaking your kernel</a>'s TCP/IP stack.</p>
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    1. POHow can I un-shorten a URL using python?
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    1. COAwesome thank you for the information. I am currently going to use Pedro Loureiro answer above since it is working for the time being. But I will refer back to this if I run into any problems. Much appreciated.
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