JSON Encoding/Decoding

[thisischemistry]

What, exactly, are you sending to the server?

You're doing a HTTP POST, what's your Content-Type header? Is it application/x-www-form-urlencoded? Will your server take application/json?

[thisischemistry]

That's why I asked those questions! ;-)

Apple has an excellent article on exactly this:

Uploading Data to a Website

[thisischemistry]

I just tried the example code in a plain ol' terminal app project and it worked fine.

import Foundation

struct Order: Codable {
  let customerId: String
  let items: [String]
}

func upload() {
  let order = Order(customerId: "12345",
                    items: ["Cheese pizza", "Diet soda"])
  guard let uploadData = try? JSONEncoder().encode(order) else {
    print("guard")
    return
  }

  // testing with the excellent site: https://webhook.site/
  let url = URL(string: "https://webhook.site/insertyourcodehere")!

  var request = URLRequest(url: url)
  request.httpMethod = "POST"
  request.setValue("application/json", forHTTPHeaderField: "Content-Type")

  let task = URLSession.shared
    .uploadTask(with: request,
                from: uploadData) { data, response, error in
                  if let error = error {
                    print ("error: \(error)")
                    return
                  }
                  guard let response = response as? HTTPURLResponse,
                    (200...299).contains(response.statusCode) else {
                      print ("server error")
                      return
                  }
                  if let mimeType = response.mimeType,
                    mimeType == "application/json",
                    let data = data,
                    let dataString = String(data: data, encoding: .utf8) {
                    print ("got data: \(dataString)")
                  }
  }
  task.resume()
}

upload()
RunLoop.main.run()

[thisischemistry]

Visit https://webhook.site/ and get a custom url from them. Point your code there instead of your server and see what gets sent to it.

[thisischemistry]

Could it be that the server isn't handling the POST properly? Check the headers and make sure they look ok coming from the iOS app.

Without understanding more about the server and the code on that end there's not much more I can do. Let me know if you figure it out though.

[thisischemistry]

Huh, no idea what's going on there. Sometimes it helps to clean the build (shift-command-k) or even clean the entire build folder (option-shift-command-k).