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    <p>Can't you do a simple request for the image and check if its a 404? Its not perfect but would catch the bulk. Depends how often you are running it. If you don't have access to the files on the server directly to check then a HTTP request is the only way. For speed you could do a header only request. Will need a code example, let me dig you one out...</p> <p>Depends on what your server will return, if you can get the headers and you just get a standard 404 page then you can check the content-length to ensure its not big enough for an image, that sounds a bit hacky but would work (theres a better way afterwards). Something like:</p> <p>(take and modified from <a href="http://ruby-doc.org/stdlib/libdoc/net/http/rdoc/classes/Net/HTTP.html#M000682" rel="nofollow noreferrer">http://ruby-doc.org/stdlib/libdoc/net/http/rdoc/classes/Net/HTTP.html#M000682</a>). </p> <pre><code>response = nil Net::HTTP.start('www.example.com', 80) {|http| response = http.head('/myimage.html') } # Assume anything with a content-length greater than 1000 must be an image? # You will need to tweek/tune this to your server and your definition of what a good image is p "Good image" unless response['content-length'] &lt; 1000 </code></pre> <p>Alternatively you can (and should really to do it the right way) get the HTTP status message as thats the definitive way of the server telling you if the image is there or not. Only trouble is you might have to download the whole thing as I don't know of a quick way of getting just the HTTP status without doing a whole request (see request method in the doc linked above for details).</p> <p>Hope that helps though.</p>
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