Convert URLRequest to NSMutableURLRequest

Question

I am trying to convert URLRequest to NSMutableURLRequest in Swift 3.0, but I cannot get it to work. This is the code I have:

 var request = self.request URLProtocol.setProperty(true, forKey: "", in: request) 

But he says

cannot convert URLRequest type to NSMutableURLRequest type.

When I try to use the “how”, it simply says that the cast will always fail. What should I do?

Answer 1

The basics of this: get the modified copy, update the modified copy, and then update the request with the mutable copy.

 let mutableRequest = ((self.request as NSURLRequest).mutableCopy() as? NSMutableURLRequest)! URLProtocol.setProperty(true, forKey: "", in: mutableRequest) self.request = mutableRequest as URLRequest 

Better to use to avoid forced reversal.

 guard let mutableRequest = (self.request as NSURLRequest).mutableCopy() as? NSMutableURLRequest else { // Handle the error return } URLProtocol.setProperty(true, forKey: "", in: mutableRequest) self.request = mutableRequest as URLRequest 

Note: self.request must be declared var not let .

Answer 2

Using Swift 4.1, the following solution worked for me

 if let mutableRequest = (request as NSURLRequest).mutableCopy() as? NSMutableURLRequest { mutableRequest.addValue("VALUE", forHTTPHeaderField: "KEY") print(mutableRequest) } 

Answer 3

Since the iOS 10 SDK MutableURLRequest deprecated in favor of using the URLRequest structure type with the var keyword. URLRequest also tied to NSMutableURLRequest so you can safely force casts:

 let r = URLRequest(url: URL(string: "https://stackoverflow.com")!) as! NSMutableURLRequest URLProtocol.setProperty("Hello, world!", forKey: "test", in: r) print(URLProtocol.property(forKey: "test", in: r as! URLRequest)!)