Ruby on Rails

On Jan 31, 2011, at 6:27 AM, agathe begault wrote:

> Hello everybody,
>
> I'm trying to allow users to download a file from a server (like a
> Sharepoint one) with a link in my application.
>
> Here is the view:
>
> ...
> <td id="with_icon"><%= link_to image_tag("up.png", :alt =>
> "Download the document", :border => 0, :id => "icon"), d.document_url
> %></td>
> ...
>
> As you can see, i give an url to the link_to method. I would like to
> know if the link is valid or not. I mean if it return really a file or
> not.
>
> I tried some methods like this one :
>
> def remote_file_exist?(url)
> res = Net::HTTP.get_response(URI.parse(URI.encode(url))) rescue
> SocketError
> res
> end
>
> This kind of method return an error for some valide urls and no error
> for some invalide urls.
>
> Have you any idea or suggestion ?

I don't have any code for you, but I do have an idea. Why not set up a
cron/rake task to read all the URLs in your database at some interval,
send a HEAD request to each of them to see if they resolve, and then
mark your database with the result of this test. Keep checking --
don't just write off a bad response, because the server could have
been having a senior moment.

Walter

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