iOS Swift file upload

open func uploadFile(fileName : String, contentType:String, fileData:Data?, parameters:Dictionary,headerParams:Dictionary, completionHandler:@escaping (Dictionary) -> (Void)){
       
        var request  = URLRequest(url: URL(string: A2Config.getBaseURL() + "/uploadFile")!)
        request.httpMethod = "POST"
        let boundary = "Boundary-\(UUID().uuidString)"
        request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
        for (key,valueForKey) in  headerParams
        {
            request.setValue(valueForKey, forHTTPHeaderField: key)
        }
       
        let body = NSMutableData()
        let boundaryPrefix = "--\(boundary)\r\n"
       
        for (key, value) in parameters {
            body.appendString(boundaryPrefix)
            body.appendString("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n")
            body.appendString("\(value)\r\n")
        }
       
        body.appendString(boundaryPrefix)
        body.appendString("Content-Disposition: form-data; name=\"uploadFile\"; filename=\"\(fileName)\"\r\n")
        body.appendString("Content-Type: \(contentType)\r\n\r\n")
        body.append(fileData!)
        body.appendString("\r\n")
        body.appendString("--".appending(boundary.appending("--")))
        request.httpBody = body as Data
        let task = URLSession.shared.dataTask(with: request) { data, response, error in
            guard let data = data, error == nil else {                                                 // check for fundamental networking error
                print("error=\(String(describing: error))")
                return
            }
           
            if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 {           // check for http errors
                print("statusCode should be 200, but is \(httpStatus.statusCode)")
                print("response = \(String(describing: response))")
                completionHandler(["status" : "error","errMsg":"Error completing request, please re-login status :\(httpStatus)"])
                return
            }
           
            let responseString = String(data: data, encoding: .utf8)
            print("responseString = \(String(describing: responseString))")
            do
            {
                let jsonData : Dictionary? = try! JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.allowFragments) as? Dictionary
                guard jsonData != nil else {
                    completionHandler(["status" : "error"])
                    return
                }
                completionHandler(["status" : "success","data":jsonData!])
            }
            catch let err {
                print("met with an error \(err)")
                completionHandler(["status" : "error"])
            }
           
        }
        task.resume()
       
    }