Convert Urlrequest to Nsmutableurlrequest

Convert URLRequest to NSMutableURLRequest

The basics of this are get a mutable copy, update the mutable copy then update 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

It would be better to use avoid the forced unwrap.

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.

How to convert NSURLRequest to NSMutableURLRequest in Swift 3?

I just figured it out. Dang it was too obvious.

let mreq = req.mutableCopy() as! NSMutableURLRequest

becomes

var mreq = req

how to convert NSmutableURLRequest to URLRequest in Swift 4?

Few points I would like to add :
1. Unwrap optional properly, use if-let/guard-let.
2. NS is most of the time from Objective-C, so remove NS and it's swift (most of the times)

func requestForAccessToken(authorizationCode: String) {
    let grantType = "authorization_code"
    let redirectURL = "https://com.appcoda.linkedin.oauth/oauth".addingPercentEncoding(withAllowedCharacters: .urlHostAllowed)
    var postParams = "grant_type=\(grantType)&"
    postParams += "code=\(authorizationCode)&"
    postParams += "redirect_uri=\(String(describing: redirectURL))&"
    postParams += "client_id=\(linkedInKey)&"
    postParams += "client_secret=\(linkedInSecret)"

    guard let url = URL(string: accessTokenEndPoint) else {
        return
    }
    let postData = postParams.data(using: .utf8) // Suggested by rmaddy
    var request = URLRequest(url: url)
    //let request =  NSMutableURLRequest(url: NSURL(string: accessTokenEndPoint)! as URL)
    request.httpMethod = "POST"
    request.httpBody = postData
    request.addValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
    let session = URLSession(configuration: URLSessionConfiguration.default)
    let task: URLSessionDataTask = session.dataTask(with: request) { (data, response, error) in

    }
    task.resume()
}

Changing url for NSMutableURLRequest after its being initialized

There is a method on NSMutableURLRequest called - (void)setURL:(NSURL *)theURL

Here's an example:

NSURL *url = [NSURL URLWithString:@"http://www.google.com"];
NSMutableURLRequest *req = [[NSMutableURLRequest alloc] initWithURL:url];
NSURL *anotherURL = [NSURL URLWithString:@"http://www.yahoo.com"];
[req setURL:anotherURL];

Specifically, the method documentation is at:
https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSMutableURLRequest_Class/Reference/Reference.html#//apple_ref/occ/instm/NSMutableURLRequest/setURL:

How to Extend URLRequest

You can just create a URLRequest custom initializer and set a default value for the parameters:

extension URLRequest {
    init(_ url: URL, userAgent: String = "your default user agent", cachePolicy: CachePolicy = .useProtocolCachePolicy, timeInterval: TimeInterval = 60) {
        self.init(url: url, cachePolicy: cachePolicy, timeoutInterval: timeInterval)
        setValue(userAgent, forHTTPHeaderField: "User-Agent")
    }
}

struct NumbersResult { }

func fetchNumbersFromServer(request: URLRequest, completion: @escaping (NumbersResult) -> ()) {
    URLSession.shared.dataTask(with: request) { data, response, error  in
        // handle response
    }.resume()
}

let url = URL(string: "https://www.google.com")!
let request = URLRequest(url)  // you can also pass another userAgent, cachePolicy and timeInterval here if needed
fetchNumbersFromServer(request: request) { numbers in

}

Swift 3 WKWebView 'URLRequest'; did you mean to use 'as' to explicitly convert? ( BUG )

Use URL and URLRequest instead:

let url = URL(string: "https://facebook.com")!
webView.load(URLRequest(url: url))

This is quite similar to https://stackoverflow.com/a/37812485/2227743: you either use NSURL and have to downcast it as URL, or you directly use the new Swift 3 structs.

If you follow the error message, your example would become:

let url = NSURL(string: "https://facebook.com")!
webView.load(URLRequest(url: url as URL))

It could be even worse:

let url = NSURL(string: "https://facebook.com")!
webView.load(NSURLRequest(url: url as URL) as URLRequest)

All this works but of course it's much better to start using URL and URLRequest in Swift 3, without using all this downcasting.

---

Related Topics