Boundary.swift

private func generateBoundary() -> String {
        return "Boundary-\(UUID().uuidString)"
    }
    
    private func createDataBody(withParamaeters parameters: Parameters?, media: [Media]?, boundary: String) -> Data {
        var body = Data()
        let linebreak = "\r\n"
        if let parameters = parameters {
            for (key, value) in parameters {
                body.append("--\(boundary + linebreak)")
                body.append("Content-Disposition: form-data; name=\"\(key)\"\(linebreak + linebreak)")
                body.append("\(value + linebreak)")
            }
        }
        if let media = media {
            for photo in media {
                body.append("--\(boundary + linebreak)")
                body.append("Content-Disposition: form-data; name=\"\(photo.key)\"; filename=\"\(photo.filename)\"\(linebreak)")
                body.append("Content-Type: \(photo.mimeType + linebreak + linebreak)")
                body.append(photo.data)
                body.append(linebreak)
            }
        }
        body.append("--\(boundary)--\(linebreak)")
        return body
    }

Media.swift

public struct Media {
    let key: String
    let filename: String
    let data: Data
    let mimeType: String
    
    init(key: String, filename: String, data: Data, mimeType: String) {
        self.key = key
        self.filename = filename
        self.data = data
        self.mimeType = mimeType
    }
    
    init?(withImage image: UIImage, forKey key: String) {
        self.key = key
        self.mimeType = "image/jpeg"
        self.filename = "\(arc4random()).jpeg"
        guard let data = image.jpegData(compressionQuality: 0.7) else { return nil }
        self.data = data
    }
}

Update.swift

var urlRequest = URLRequest(url: URL(string: "https://favorestodevapi.azurewebsites.net/v.1/customer/profile/picture")!)
let boundary = generateBoundary()
let dataBody = createDataBody(withParamaeters: [:], media: [Media(withImage: UIImage(named: "3DA6ADF15C7B3D61615BA5BB726DA6112BC8FFAC.jpg")!, forKey: "image")!], boundary: boundary)
let urlSession = URLSession.shared
urlRequest.httpMethod = "PUT"
urlRequest.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
urlRequest.setValue("Bearer MjQMuRMz1iCXZ84SWpwvwIZSqDrMEDTgaZNS7EfHbbpavBTFPgXfnKaYh5A5tu0pwSb7csfl5P_otCIBjqP6dlQxtix0sdvLthfw71ochCZHdmbiKI9ENIwBcGBK1qIMOWKM-N0L3rwldjTrCwMM_1K8t6aXjR0FjQOTPLPia-doorQ9gwmfMovbBjepzZmVuNK5siKC5ars4IwdP9BH2cRLnqy2_QL9GkMo-6SOQk6LO9sY6rPqKzy8aG7sqBW7fEeRsTFol-KsiVVpE9Q6F_iNFD8Fjv5hy8npkSJNxKRG8O07jMZcnut6Yt6obs97Bdiad6JX3rpPFAHobmR9eLw7D9zYWDR70IFPX-GBStRGaNtI6q1NvfWlTVq-M-BffBZ64fT9VpaYbzlwldsFIq0rHqYu701SbpkiDLd344d--pnoiKZzA575ktgA_FdtBgeql8MDKM92QXi_UV2LTKHUBWfgI8b8vsMuZWNIC3kj0LajZ21JsU6Zm-A72SfWpsaJoLerhw1LWrnP_jSjJ3Lgy-YKGyOIRtLeAkqG1mNz-Drc6i6Tc2ixQ3WDzxJQyqr4Np0-XCxGrMOT2N2zaJEYONzveu3MP0JfAJo5dzyWIEbm2JQ5UH8xJrIu_3vMm0CdHRJA_9yuoqAVoldyuYWLftW7n0_C_XENUb7j5dIwvgOqh2C0iaNGUWV2qOEi", forHTTPHeaderField: "Authorization")
urlRequest.httpBody = dataBody
urlSession.dataTask(with: urlRequest) { (data, response, error) in
    
}
.resume()

▿ Optional

• some : <NSHTTPURLResponse: 0x600000436220> { URL: https://favorestodevapi.azurewebsites.net/v.1/customer/profile/picture } { status code: 200, headers {
  "Content-Encoding" = gzip;
  "Content-Length" = 303;
  "Content-Type" = "application/json; charset=utf-8";
  Date = "Fri, 10 May 2019 06:42:21 GMT";
  Server = "Microsoft-IIS/10.0";
  "Set-Cookie" = "ARRAffinity=92e0f4e5d383bb99e50dd303c95d03b89a4859c6703571f9262e9d743586de39;Path=/;HttpOnly;Domain=favorestodevapi.azurewebsites.net";
  Vary = "Accept-Encoding";
  "x-powered-by" = "ASP.NET";
  } }