iOS 13 WKWebView not showing pdf file anymore

I figured out that the response' content-type was "application/octet-stream" instead of "application/pdf"

So I load the WKWebView as:

if let myURL = URL(string:"somefileurl.pdf") {
    if let data = try? Data(contentsOf: myURL) {
       webViewPdf.load(data, mimeType: "application/pdf", characterEncodingName: "", baseURL: myURL)
    }
}