A simple way to create multipart form requests in Swift.
import MultipartForm
let form = MultipartForm(parts: [
MultipartForm.Part(name: "a", value: "1"),
MultipartForm.Part(name: "b", value: "2"),
MultipartForm.Part(name: "c", data: imageData, filename: "3.png", contentType: "image/png"),
])
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.setValue(form.contentType, forHTTPHeaderField: "Content-Type")
let task = session.uploadTask(with: request, from: form.bodyData)
task.resume()To upload a file in the background, you can write out form.bodyData to a file and create an upload task from that.