在ios 13中，WKWebView不适用于从远程URL加载PDF

我正在使用远程URL在webview中显示pdf文件。ios 12中的UIWebView可以正常工作。 但是，在iOS 13中显示了空白页面。我还尝试了WKWebview。iOS 12和iOS 13都显示空白页。我的pdf url不是.pdf扩展名

看起来像

这是我的密码

     NSString *body = [NSString stringWithFormat:@"docno=%@&doctype=%@&atch=%@&fname=%@&empcode=%@", gStrTranId,gStrTranNo,gStrAttachmentType,gStrFileName,gStrUserCode];

    body = [body stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLFragmentAllowedCharacterSet]];

   NSURL *aUrl = [NSURL URLWithString:[NSString stringWithFormat:@"https://xxx.xxx.xxx.xxx/MYTASKS4/filedownload.ashx?%@",body]];

    NSMutableURLRequest *request = [NSMutableURLRequest new];

    NSDictionary *customHeaders = @{@"Authorization": [NSString stringWithFormat:@"Bearer %@",[SESSION getKeyValue]] , @"auth_key": [NSString stringWithFormat:@"Bearer %@",[SESSION getAuthorizeCode]], @"Content-Type": @"text/xml; charset=utf-8" };
     
     // set the new headers
     for(NSString *key in [customHeaders allKeys]){
         [request addValue:[customHeaders objectForKey:key] forHTTPHeaderField:key];
     }

    [request setHTTPMethod:@"POST"];

    [request setURL:aUrl];

    self.myWebView1.navigationDelegate = self;

    self.myWebView1.autoresizingMask = UIViewAutoresizingFlexibleHeight;

    [self.myWebView1 loadRequest:request];

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我也面临同样的问题，如果你得到了解决方案，请发布答案。我也面临同样的问题，如果你得到了解决方案，请发布答案。