How to add custom HTTP Header on WKWebView

Hi there.

I would like to create a custom

WKWebView

HTTP

Overriding method with selector 'loadRequest:' has incompatible type '(NSURLRequest) -> WKNavigation?'

My code is the following code.

import WebKit
class CustomWkWebView: WKWebView {

    override func loadRequest(request: NSURLRequest) -> WKNavigation? {
        var mutable_request = request.mutableCopy() as! NSMutableURLRequest
        mutable_request.setValue("SHOTWORKS_IOS_APLICATION", forHTTPHeaderField: "App-MyParameter")
        return super.loadRequest(mutable_request.copy() as! NSURLRequest)
     
    }
}

I have only written it by suggestion.

I don't know why i couldn't override.

What should I do?

Following capture is this error.