Set useragent in WKWebview

Question

How do I set a custom useragent string in a WKWebView? I\'m trying to embed the version of my app so that my server-side can see what features are available. I found the followi

Answer 1

the default User-Agent in WKWebView is as

Mozilla/5.0 (iPhone; CPU iPhone OS 13_3 like Mac OS X)

You can customize the WKWebView User-Agent

webView.customUserAgent = "zgpeace User-Agent"

I write a demo for WKWebView:

func requestWebViewAgent() {
        print("requestWebViewAgent")

        let webView = WKWebView()
        webView.evaluateJavaScript("navigator.userAgent") { (userAgent, error) in
            if let ua = userAgent {
                print("default WebView User-Agent > \(ua)")
            }

            // customize User-Agent
            webView.customUserAgent = "zgpeace User-Agent"
        }
    }

Warning: "User-Agent" is nil from webView, when webView is released. You can set webView object as property to keep the webView.

NSURLSession send User-Agent by default.
default User-Agent style like.

"User-Agent" = "UserAgentDemo/1 CFNetwork/1121.2.1 Darwin/19.2.0";

We can customize the User-Agent.

let config = URLSessionConfiguration.default
config.httpAdditionalHeaders = ["User-Agent": "zgpeace User-Agent"]

I write a demo for URLSession in the below.

     func requestUrlSessionAgent() {
        print("requestUrlSessionAgent")

        let config = URLSessionConfiguration.default
        // default User-Agent: "User-Agent" = "UserAgentDemo/1 CFNetwork/1121.2.1 Darwin/19.2.0";
        // custom User-Agent
        config.httpAdditionalHeaders = ["User-Agent": "zgpeace User-Agent"]
        let session = URLSession(configuration: config)

        let url = URL(string: "https://httpbin.org/anything")!
        var request = URLRequest(url: url)
        request.httpMethod = "GET"

        let task = session.dataTask(with: url) { data, response, error in

            // ensure there is no error for this HTTP response
            guard error == nil else {
                print ("error: \(error!)")
                return
            }

            // ensure there is data returned from this HTTP response
            guard let content = data else {
                print("No data")
                return
            }

            // serialise the data / NSData object into Dictionary [String : Any]
            guard let json = (try? JSONSerialization.jsonObject(with: content, options: JSONSerialization.ReadingOptions.mutableContainers)) as? [String: Any] else {
                print("Not containing JSON")
                return
            }

            print("gotten json response dictionary is \n \(json)")
            // update UI using the response here
        }

        // execute the HTTP request
        task.resume()

    }

NSURLConnection send User-Agent by default.
default User-Agent style like.

"User-Agent" = "UserAgentDemo/1 CFNetwork/1121.2.1 Darwin/19.2.0";

We can customize the User-Agent.

urlRequest.setValue("URLConnection zgpeace User-Agent", forHTTPHeaderField: "User-Agent")

I write a demo for URLConnection in the below.

func requestUrlConnectionUserAgent() {
    print("requestUrlConnectionUserAgent")

    let url = URL(string: "https://httpbin.org/anything")!
    var urlRequest = URLRequest(url: url)
    urlRequest.httpMethod = "GET"
    // default User-Agent: "User-Agent" = "UserAgentDemo/1 CFNetwork/1121.2.1 Darwin/19.2.0";
    urlRequest.setValue("URLConnection zgpeace User-Agent", forHTTPHeaderField: "User-Agent")

    NSURLConnection.sendAsynchronousRequest(urlRequest, queue: OperationQueue.main) { (response, data, error) in
        // ensure there is no error for this HTTP response
        guard error == nil else {
            print ("error: \(error!)")
            return
        }

        // ensure there is data returned from this HTTP response
        guard let content = data else {
            print("No data")
            return
        }

        // serialise the data / NSData object into Dictionary [String : Any]
        guard let json = (try? JSONSerialization.jsonObject(with: content, options: JSONSerialization.ReadingOptions.mutableContainers)) as? [String: Any] else {
            print("Not containing JSON")
            return
        }

        print("gotten json response dictionary is \n \(json)")
        // update UI using the response here
    }

  }

Demo in github:
https://github.com/zgpeace/UserAgentDemo.git