Vapor Facebook Bot

gistfile1.txt

import Vapor
import Foundation
import HTTP

let drop = Droplet()

class Message {
    var textString: String?
    var sendJson: [String: AnyObject]?
    
    init(message: JSON) {
        let senderJson = message["sender"]!
        let messageJson = message["message"]
        if let messageJson = messageJson {
            self.textString = messageJson["text"]?.string
        }
        let idJson = ["id": senderJson["id"]!.string!]
        if let textString = self.textString {
            let textJson = ["text": textString]
            self.sendJson = ["recipient": idJson as AnyObject, "message": textJson as AnyObject]
        }
    }
}

let PAGE_ACCESS_TOKEN = ""

drop.get("fbwebhook") { request in
    print("get webhook")
    guard let token = request.data["hub.verify_token"]?.string else {
        throw Abort.badRequest
    }
    guard let response = request.data["hub.challenge"]?.string else {
        throw Abort.badRequest
    }
    
    if token == "2318934571" {
        print("send response")
        return Response(body: response)
    } else {
        return Response(body: "Error, invalid token")
    }
}

drop.post("fbwebhook") { request in
    print("Start")
    let url = "https://graph.facebook.com/v2.6/me/messages?access_token=" + PAGE_ACCESS_TOKEN

    //var body = request.body
    if let json = request.json {
        let entryArray = (json["entry"]?.array)! as! [JSON]
        let entry = entryArray[0]
        let messageArray = (entry["messaging"]?.array)! as! [JSON]
        let messageJson = messageArray[0]
        print(messageJson)
        let message = Message(message: messageJson)
        if let sendJson = message.sendJson {
            let jsonData = try! JSONSerialization.data(withJSONObject: sendJson, options: JSONSerialization.WritingOptions.prettyPrinted)
            let urlRequest = NSMutableURLRequest(url: URL(string: url)!)
            urlRequest.httpMethod = "POST"
            urlRequest.setValue("application/json; charset=utf-8", forHTTPHeaderField: "Content-Type")
            urlRequest.httpBody = jsonData
            let task = URLSession.shared.dataTask(with: urlRequest as URLRequest, completionHandler: { (data, response, error) in
                if let err = error {
                    return
                }
            })
            task.resume()
        } else {
            return Response(body: "error")
        }
    }
    return Response(body: "text message")
}


drop.get("hello") { request in
    return "Hello, world!"
}

drop.get { req in
    return try drop.view.make("welcome", [
    	"message": drop.localization[req.lang, "welcome", "title"]
    ])
}


drop.run()

I receive this error - 'Response had no 'Content-Type' header' here.