Posting a File and Associated Data to a RESTful WebService preferably as JSON

In an application I am developing RESTful API and we want the client to send data as JSON. Part of this application requires the client to upload a file (usually an image) as well as information about the image. I'm having a hard time tracking down how this happens in a single request. Is it possible to Base64 the file data into a JSON string? Am I going to need to perform 2 posts to the server? S

[lenore]

ファイルをjsonで送る方法。multiparty/relatedが気になる