I am trying to detect URL of current video playing from UIWebView, with this method :

```
func webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebViewNavigationType) -> Bool
    {

        NotificationCenter.default.addObserver(self, selector: #selector(playerItemBecameCurrent(notification:)), name: NSNotification.Name("AVPlayerItemBecameCurrentNotification"), object: nil)

        //urlTextField.text = webView.request?.url?.absoluteString

        return true
    }

  func playerItemBecameCurrent(notification:Notification)  {

        let playerItem: AVPlayerItem? = notification.object as? AVPlayerItem
        if playerItem == nil {
            return
        }
        // Break down the AVPlayerItem to get to the path
        let asset: AVURLAsset? = (playerItem?.asset as? AVURLAsset)
        let url: URL? = asset?.url
        let path: String? = url?.absoluteString
        print(path!)

    }

```

This code works but the video URL doesn't contain any video file extension:
 for example here is YouTube and Vimeo video ULRs :

```
https://r5---sn-ab5l6nzr.googlevideo.com/videoplayback?mime=video%2Fmp4&requiressl=yes&clen=27257208&mn=sn-ab5l6nzr&mm=31&mv=m&mt=1499534990&key=yt6&ms=au&source=youtube&ip=107.182.226.163&sparams=clen%2Cdur%2Cei%2Cgir%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Cratebypass%2Crequiressl%2Csource%2Cexpire&initcwndbps=3565000&id=o-ACG22m-TtwyC8tSG_AHUJk3qOPvhUm1X_-qRjy07pjIx&ei=-hZhWZXcJ_aV8gS2tbCQDg&lmt=1497638262979584&ratebypass=yes&gir=yes&pl=25&expire=1499556698&dur=316.093&signature=94C8ED3E4AF64A7AC9F1B7E226454823B236CA55.C18F5F5D9D314B73EDD01DFC4EA3CEA1621AC6C7&ipbits=0&itag=18&cpn=Wb3RPNfJRcFx5P-x&c=MWEB&cver=1.20170706&ptk=TiTV2010%2Buser&oid=1nI2Jk44kRu4HLE6kGDUrA&ptchn=E2VhHmwp3Y_wZvgz_LJvfg&pltype=content

```

and Vimeo :

```
https://36skyfiregce-vimeo.akamaized.net/exp=1499539063~acl=%2F222646835%2F%2A~hmac=dc3caeb64501f537e2795ee8e121aed75a7eed9ba4e1b921fe92c757fe06b314/222646835/video/778109097,778109103,778109102,778109101/master.m3u8?f=dash 

```