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How can i add custom Interceptor in URLRequest and URLSession for all URLRequest in app. So i can add my own custom HTTPHeader Fields at one place for all http request, there is alamofire Interceptor but i don't want to use alamofire, i want Interceptor in urlsession and urlrequest in swift 4.
I extend the urlrequest but not work for me.

//1st One 
extension URLRequest 
 init(_ url: URL) 
 self.init(url: url)
 self.setValue(deviceInformation.shared.deviceModel, forHTTPHeaderField: "deviceModel")
 self.allHTTPHeaderFields?.updateValue(deviceInformation.shared.deviceModel, forKey: "deviceModel1")
 
 

// 2nd one

extension URLRequest 
 var instance: URLRequest 
 var instanceRequest: URLRequest!
 instanceRequest.allHTTPHeaderFields?.updateValue(deviceInformation.shared.deviceModel, forKey: "deviceModel")
 instanceRequest.addValue(deviceInformation.shared.deviceSystemName, forHTTPHeaderField: "deviceSystemName")
 instanceRequest.addValue(deviceInformation.shared.deviceSystemVersion, forHTTPHeaderField: "deviceSystemVersion")
 instanceRequest.addValue(deviceInformation.shared.getAppVersion(), forHTTPHeaderField: "appVersion")
 return instanceRequest
 

//both are not working

 //Here is the answer for "Custom Header Fields" for all URLRequest. 

extension URLRequest 
 init(_ url: URL) 
 self.init(url: url)
 self.setValue("Value", forHTTPHeaderField: "fieldNamme")
 
 

//how to use
func aBC()
 //how to call it.
 let myUrl = URL(string: "Your url string")
 let request = URLRequest(myUrl) //this will work and add custom header
 //let request = URLRequest(url: myUrl) // this will not work because it call the super init method of urlrequest.

 request.httpMethod = "POST"
 do 
 request.httpBody = try JSONSerialization.data(withJSONObject: ["bodyParam" : "value"], options: )
 catch let error 
 return
 

 let dataTask = URLSession.shared.dataTask(with: request) 
 data,response,error in

 do 
 //.
 // .
 // .
 catch let error as NSError 
 
 
 dataTask.resume()