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    <h1>Short Answer</h1> <p>There is no way to specify a <code>Content-Type</code> value in the filesystem when you create your file. In fact, this is probably not the best way to achieve your goal. </p> <p>In order to suggest that a browser download a file rather than displaying it, you can leave <code>Content-Type: text/csv</code> and add the header <code>Content-Disposition: attachment</code> or <code>Content-Disposition: attachment; filename=&lt;your custom filename&gt;.csv</code> to change the filename in the "Save As..." dialog.</p> <h1>Setting <code>Content-Disposition</code> using Paperclip and AWS::S3</h1> <p>To set the <code>Content-Disposition</code> header using Paperclip, you can add a key to your <code>has_attached_file</code> definition: <a href="http://rubydoc.info/gems/paperclip/2.4.5/Paperclip/Storage/S3"><code>s3_headers</code></a>.</p> <pre><code>has_attached_file :spreadsheet, :path =&gt; 'perhaps/a/custom/path/:class/:id/:filename', :or_maybe =&gt; 'other parameters', :s3_headers =&gt; { 'Content-Disposition' =&gt; 'attachment' } </code></pre> <h2>Content-Type issues</h2> <p>By default, a file with the extension <code>.csv</code> should be classified as a <code>text/csv</code> file. You can check this with <code>Mime::Type.lookup_by_extension('csv').to_s # =&gt; "text/csv"</code>. If this is not the case, you can add text/csv as a custom mime-type by creating a <code>config/initializers/mime_types.rb</code> file and adding:</p> <pre><code>Mime::Type.register 'text/csv', :csv </code></pre> <p>However, this should almost always not be the case (unless Windows does something funky with content types; I've only tested in Linux).</p> <h1>Examples</h1> <p>I've put up two examples that you can check. The first is a CSV file uploaded with a <code>text/plain</code> mime-type which forces the browser to show it in-browser without downloading (my browser downloaded <code>text/csv</code> files).</p> <p><a href="https://s3.amazonaws.com/stackoverflow-demo/demo.csv">https://s3.amazonaws.com/stackoverflow-demo/demo.csv</a></p> <p>The second also has a mime-type of <code>text/plain</code>, but I added a header <code>Content-Disposition: attachment; filename="mycustomname.csv"</code></p> <p><a href="https://s3.amazonaws.com/stackoverflow-demo/demo-download.csv">https://s3.amazonaws.com/stackoverflow-demo/demo-download.csv</a></p> <p>You'll notice that the first link is displayed in browser, while the second link is downloaded with the custom name <code>mycustomname.csv</code>.</p> <p>To learn why, look at the headers using <code>curl -I</code>.</p> <pre><code>$ curl -I https://s3.amazonaws.com/stackoverflow-demo/demo-download.csv HTTP/1.1 200 OK Content-Disposition: attachment; filename="mycustomname.csv" Content-Type: text/plain </code></pre> <p>versus</p> <pre><code>$ curl -I https://s3.amazonaws.com/stackoverflow-demo/demo.csv HTTP/1.1 200 OK Content-Type: text/plain </code></pre> <p>Note: unrelated headers were removed.</p>
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    1. COThis is becoming one hell of an answer, props to you!
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    2. COBenjamin, I'm using Paperclip, which makes use of AWS-S3.
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    3. CO@BenoitGarret Thanks. Is there anything else you think should be added?
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