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POHow do you ask an external program to open a file being served through a web browser? What about detecting if the external program is installed?
 

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  1. POHow do you ask an external program to open a file being served through a web browser? What about detecting if the external program is installed?
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    <p>I have a two part question. The first I <em>think</em> I have an okay answer to....</p> <p>I am looking to force an external program to be called up to view a configuration file for an application my company is working on. The basic gist I guess is to set the Content-type header to type that your application is associating with, and then serving the contents of the file. I was thinking its simply structured like this:</p> <pre><code>&lt;?php Header( "Content-type: application/blahtype" ); ?&gt; output of xml configuration file goes here... </code></pre> <p>Any other best practices here? Obviously the user is going to have to allow the external application access to this file universally in all browsers, unless they have a plugin installed in their browser that will handle the content-type, like adobe pdf. This isn't viable for our company right now, so we're willing to live with the confirmation screen.</p> <p>The second part of the question is a little bit more complex, I think. How do we detect if the user has the application installed, and if they do not, serve them different content (a sign up page, or the application executable itself)? I'm not wondering about the logistics of serving different content, but simply the detection process. Is it possible for an application to install a lifetime cookie in the browsers cache installed on the machine? That's not a perfect solution, because the user could clear their cache of course. How else can we accomplish this?</p> <p>Examples of programs that do this are Amazon MP3 Downloader (I've actually gotten into a bad state with this once or twice), and iTunes U. You can see iTunes U example on Stanfords CS193P page here: <a href="http://www.stanford.edu/class/cs193p/cgi-bin/index.php" rel="nofollow noreferrer">http://www.stanford.edu/class/cs193p/cgi-bin/index.php</a></p> <p>Much appreciate any advice, Josh</p>
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