Reading request data about ambassador HOT 3 CLOSED

struct RedirectResponse: WebApp {

    func urlRequest(_ environ: [String: Any]) -> URLRequest {
        //reading environment variables and transforming header keys to their initial values....
        var request = URLRequest(url: URL(string: "http://httpbin.org/post")!)
        request.httpMethod = "POST"
        return request
    }

    public func app(_ environ: [String : Any], startResponse: @escaping ((String, [(String, String)]) -> Swift.Void), sendBody: @escaping ((Data) -> Swift.Void)) {
        let input = environ["swsgi.input"] as! SWSGIInput
        DataReader.read(input) { incomingData in
            var request = self.urlRequest(environ)
            request.httpBody = incomingData
            let task = URLSession.shared.dataTask(with: request) { (data, resp, error) in
                startResponse("200 OK", [])
                if let data = data {
                    sendBody(data)
                }
                sendBody(Data())
            }
            task.resume()
        }
    }
}

$ curl -i -X POST -H "mobile-app: IOS-838" -H "Content-Type: application/json" -H "Accept-Encoding: gzip;q=1.0, compress;q=0.5" -H "Accept-Language: en-US;q=1.0, en;q=0.9" -H "User-Agent: Alamofire/4.2.0" -d "{\"country\":\"us\",\"locale\":\"en-US\",\"grant_type\":\"client_credentials\",\"client_id\":\"...\",\"client_secret\":\"...\",\"scope\":\"public\"}" "http://localhost:8080/auth/oauth2/client/access_token"
HTTP/1.1 200 OK
Connection: close
Server: Embassy

{
  "args": {}, 
  "data": "", 
  "files": {}, 
  "form": {
    "{\"country\":\"us\",\"locale\":\"en-US\",\"grant_type\":\"client_credentials\",\"client_id\":\"...\",\"client_secret\":\"...\",\"scope\":\"public\"}": ""
  }, 
  "headers": {
    "Accept": "*/*", 
    "Accept-Encoding": "gzip, deflate", 
    "Accept-Language": "en-us", 
    "Content-Length": "124", 
    "Content-Type": "application/x-www-form-urlencoded", 
    "Host": "httpbin.org", 
    "User-Agent": "xctest (unknown version) CFNetwork/807.2.14 Darwin/16.4.0 (x86_64)"
  }, 
  "json": null, 
  "origin": "xxxxx", 
  "url": "http://httpbin.org/post"
}