public synchronized String getMime() throws ProxyCacheException {
        if (TextUtils.isEmpty(sourceInfo.mime)) {
            fetchContentInfo();
        }
        return sourceInfo.mime;
    }
{@link Source} that uses http resource as source for {@link ProxyCache}.

@author Alexey Danilov (danikula@gmail.com).
dkplayer-videocache/src/main/java/com/danikula/videocache/HttpUrlSource.java