Very slow to load large local video about cordova-plugin-ionic-webview

[jbgtmartin]

Maybe it's the same issue as this one?
It seems to be fixed since iOS 15.6 at least.

The only fix I've found so far is to use version 2 of this plugin, which handles the files differently, and to wait 1 or 2 years for our users to update their iOS before switching to the last version...

[richpixel]

Thanks for your reply - I'm actually using iOS 16 on my device so I don't think this is it. I do notice there's some code in IONAssetHandler that's responsible for 'serving' the video - it appears to load the entire contents of the media file (into virtual memory which is good) and then somehow serve it through the response. This gets called repeatedly as the video is buffering/before play starts. I think this must have something to do with the issue. I suspect there must be some way to stream the data here, but I'm not sure how:

- (void)webView:(WKWebView *)webView startURLSchemeTask:(id <WKURLSchemeTask>)urlSchemeTask
{
    NSString * startPath = @"";
    NSURL * url = urlSchemeTask.request.URL;
    NSString * stringToLoad = url.path;
    NSString * scheme = url.scheme;

    if ([scheme isEqualToString:self.scheme]) {
        if ([stringToLoad hasPrefix:@"/_app_file_"]) {
            startPath = [stringToLoad stringByReplacingOccurrencesOfString:@"/_app_file_" withString:@""];
        } else {
            startPath = self.basePath ? self.basePath : @"";
            if ([stringToLoad isEqualToString:@""] || [url.pathExtension isEqualToString:@""]) {
                startPath = [startPath stringByAppendingString:@"/index.html"];
            } else {
                startPath = [startPath stringByAppendingString:stringToLoad];
            }
        }
    }
    NSError * fileError = nil;
    NSData * data = nil;
    if ([self isMediaExtension:url.pathExtension]) {
        // ENTIRE CONTENTS OF MEDIA FILE IS LOADED:
        data = [NSData dataWithContentsOfFile:startPath options:NSDataReadingMappedIfSafe error:&fileError];
    }
    if (!data || fileError) {
        data =  [[NSData alloc] initWithContentsOfFile:startPath];
    }
    NSInteger statusCode = 200;
    if (!data) {
        statusCode = 404;
    }
    NSURL * localUrl = [NSURL URLWithString:url.absoluteString];
    NSString * mimeType = [self getMimeType:url.pathExtension];
    id response = nil;
    if (data && [self isMediaExtension:url.pathExtension]) {
        response = [[NSURLResponse alloc] initWithURL:localUrl MIMEType:mimeType expectedContentLength:data.length textEncodingName:nil];
    } else {
        NSDictionary * headers = @{ @"Content-Type" : mimeType, @"Cache-Control": @"no-cache"};
        response = [[NSHTTPURLResponse alloc] initWithURL:localUrl statusCode:statusCode HTTPVersion:nil headerFields:headers];
    }
    
    [urlSchemeTask didReceiveResponse:response];
    [urlSchemeTask didReceiveData:data]; // DATA IS "SERVED" , BUT THIS GETS CALLED REPEATEDLY
    [urlSchemeTask didFinish];

}

A potential hint at a solution:
https://stackoverflow.com/questions/58217566/how-to-serve-big-files-using-wkurlschemehandler

[ghenry22]

could be missing range headers when fetching from local file system, without range headers the entire file will be loaded.

[richpixel]

Thanks for the reply, that sounds promising. Do you have an idea for how to have the ionic webview accept range headers? Or supply them in the request somehow? It might actually need to happen somewhere in the code I posted.