Swift 3 Alamofire multipart upload

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For example, using Alamofire 4.0.0 in Swift 3:

(make sure you are 4.0.0 ready as it looks like you haven’t updated your Alamofire yet)

Alamofire.upload(multipartFormData: { (multipartFormData) in
        // code
    }, to: URL, encodingCompletion: { (result) in
        // code
    })

or 

Alamofire.upload(multipartFormData: { (multipartFormData) in
        // code
    }, with: URL, encodingCompletion: { (result) in
        // code
    })

So headers need to be passed by URL request:

let URL = try! URLRequest(url: "http://example.com", method: .get, headers: headers)

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