- [Providing names for cached files](#providing-names-for-cached-files)

By default `AndroidVideoCache` uses MD5 of video url as file name. But in some cases url is not stable and it can contain some generated parts (e.g. session token). In this case caching mechanism will be broken. To fix it you have to provide own `FileNameGenerator`:

``` java

public class MyFileNameGenerator implements FileNameGenerator {

// Urls contain mutable parts (parameter 'sessionToken') and stable video's id (parameter 'videoId').

// e. g. http://example.com?videoId=abcqaz&sessionToken=xyz987

public String generate(String url) {

Uri uri = Uri.parse(url);

String videoId = uri.getQueryParameter("videoId");

return videoId + ".mp4";

}

}

HttpProxyCacheServer proxy = HttpProxyCacheServer.Builder(context)

.fileNameGenerator(new MyFileNameGenerator())

.build()