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    <p>Just because you're not wrapping the entire request body in JSON, doesn't meant it's not RESTful to use <code>multipart/form-data</code> to post both the JSON and the file (or multiple files) in a single request:</p> <pre><code>curl -F "metadata=&lt;metadata.json" -F "file=@my-file.tar.gz" http://example.com/add-file </code></pre> <p><strong>on the server side</strong> (using Python as the programming lingua franca here):</p> <pre><code>class AddFileResource(Resource): def render_POST(self, request): metadata = json.loads(request.args['metadata'][0]) file_body = request.args['file'][0] ... </code></pre> <p><strong>to upload multiple files, it's possible to either use separate "form fields" for each:</strong></p> <pre><code>curl -F "metadata=&lt;metadata.json" -F "file1=@some-file.tar.gz" -F "file2=@some-other-file.tar.gz" http://example.com/add-file </code></pre> <p>...in which case the server code will have <code>request.args['file1'][0]</code> and <code>request.args['file2'][0]</code></p> <p><strong>or reuse the same one for many:</strong></p> <pre><code>curl -F "metadata=&lt;metadata.json" -F "files=@some-file.tar.gz" -F "files=@some-other-file.tar.gz" http://example.com/add-file </code></pre> <p>...in which case <code>request.args['files']</code> will simply be a list of length 2.</p> <p><strong>or actually pass multiple files into a single field in one go:</strong></p> <pre><code>curl -F "metadata=&lt;metadata.json" -F "files=@some-file.tar.gz,some-other-file.tar.gz" http://example.com/add-file </code></pre> <p>...in which case <code>request.args['files']</code> will be a string containing all the files, which you'll have to parse yourself — not sure how to do it, but I'm sure it's not difficult, or better just use the previous approaches.</p> <p>The difference between <code>@</code> and <code>&lt;</code> is that <code>@</code> causes the file to get attached as a file upload, whereas <code>&lt;</code> attaches the contents of the file as a text field.</p> <p><em>P.S.</em> Just because I'm using <code>curl</code> as a way to generate the <code>POST</code> requests doesn't mean the exact same HTTP requests couldn't be sent from a programming language such as Python or using any sufficiently capable tool.</p>
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    1. POHow do I upload a file with metadata using a REST web service?
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    1. USOndrej Slinták
    1. USErik Allik
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    1. COI had been wondering about this approach myself, and why I hadn't seen anyone else put it forth yet. I agree, seems perfectly RESTful to me.
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