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copied!<p>I'm not sure what you're expecting your second curl command to do, but I'm pretty sure it's not doing what you want. If you give more than one <code>--data</code> or <code>-d</code> parameters to curl, their values will be joined together, separated by <code>&</code>.</p> <p>For example, if you have a file <code>test.txt</code> with contents <code>This is a test.</code> and you do request like this: </p> <pre><code>curl -i -X POST -H Accept:application/json -H Content-Type:application/json \ -d '{file:{filename:"test.txt",md5sum:"ab3d2f"}}' \ --data-binary @test.txt 'http://localhost:4567/upload/test.txt' </code></pre> <p>This is what the request looks like:</p> <pre><code>POST /upload/test.txt HTTP/1.1 User-Agent: curl/7.24.0 (x86_64-apple-darwin12.0) libcurl/7.24.0 OpenSSL/0.9.8r zlib/1.2.5 Host: localhost:4567 Accept:application/json Content-Type:application/json Content-Length: 61 {file:{filename:"test.txt",md5sum:"ab3d2f"}}&This is a test. </code></pre> <p>The request body is not valid JSON. It's not valid URL-encoded form data or multi-part form data either.</p> <p>It's not obvious how to combine JSON requests with file uploads. Here are some options:</p> <ul> <li>Just use <code>multipart/form-data</code>. That is, do what you're doing right now with your Ruby code and <code>-F</code> option to curl. </li> <li>Use <code>multipart/form-data</code> with one part of JSON for metadata and other part with the raw uploaded file.</li> <li>Embed the file into JSON by base64-encoding it.</li> <li>Do some kind of two-request workflow where first you post the metadata as JSON and then you upload the file in the POST body.</li> </ul> <p>I'd probably go with the first option, because it's so widely supported.</p>

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