The download file cannot get the correct name

Code Block objc
// Test URL
https://dwarf.sogoucdn.com/trans/durl/31-193475685vgiwgIi7?action=d&ow_name=testtesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttest.zip

• I opened this URL in Safari and Chrome, and I found that Chrome displayed the correct name "testtesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttest.zip", while the file name downloaded by Safari displayed "31-193475685vgiwgIi7".

• I captured the WKNavigationResponse object in the delegate of WKWebView and found that the "Content-Disposition" was incomplete.

• I tried other URL addresses. If the filename in "Content-Disposition" is very long, this bug will appear.

Code Block objc
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler {
    if ([navigationResponse.response isKindOfClass:[NSHTTPURLResponse class]])
   {
        NSHTTPURLResponse *response = (NSHTTPURLResponse*)navigationResponse.response;
        NSString *contentDisposition = [response.allHeaderFields valueForKey:@"Content-Disposition"];
        NSLog(@"%@",contentDisposition);
   }
}
/*
"Content-Disposition" =     (
        "attachment; filename=\"testtesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttest"
    );
*/

• If I use NSURLSessionDataTask to request, I can get the complete "Content-Disposition"

Code Block objc
"Content-Disposition" =     (
        "attachment; filename=\"testtesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttest.zip\"; filename*=UTF-8''testtesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttesttest.zip"
    );

• This question is very important because I embed WKWebView in my app and use it to support file downloading. WKWebView does not seem to support downloading files, but I need to complete its downloading ability.

• This problem seems to exist on iOS too

• I want to know how I can solve this problem