Can't get correct ts url with CacheDataSource when playing hls with a 302 status code

[cr1944]

• Condition:

1. a hls video url URL1( host is "A"), the response code is 302 and the location is the real m3u8 url URL2( host is "B")
2. the response is hls playlist, and the segment url is not absolute path, like this:

/u7wPKxRMeOWP3oNt3QCX7_8Ot1w=/luFxh3E0vkK_W_gtsUvwNTzPRszl/000000.ts?e=1485201754

3. use DefaultDataSource or CacheDataSource to load the data.

• Result:

1. if I use DefaultDataSource:

DataSource.Factory dataSourceFactory = new DefaultDataSourceFactory(this, BANDWIDTH_METER,
                new OkHttpDataSourceFactory(getOkHttpClient(), getUa(), BANDWIDTH_METER));
return new HlsMediaSource(uri, dataSourceFactory, mainHandler, eventLogger);

the ParsingLoadable will use datasource's uri:
result = parser.parse(dataSource.getUri(), inputStream);
exoplayer will correctly use URL2's host "B" to join the ts segment url.
2. if I use CacheDataSource, however,exoplayer will use URL1's host "A", which is wrong, the response code will be 404:

 CacheEvictor cacheEvictor = new LeastRecentlyUsedCacheEvictor(100 * 1024 * 1024);
        Cache cache = new SimpleCache(new File(getExternalCacheDir(), "media_cache"), cacheEvictor);
        DataSource.Factory upstreamFactory = new OkHttpDataSourceFactory(getOkHttpClient(), getUa(), BANDWIDTH_METER);
        DataSource.Factory dataSourceFactory = new CacheDataSourceFactory(cache, upstreamFactory, CacheDataSource.FLAG_BLOCK_ON_CACHE, 100 * 1024 * 1024);
return new HlsMediaSource(uri, dataSourceFactory, mainHandler, eventLogger);

The reason is, DefaultDataSource.getUri() calls OkHttpDataSource.getUri(), which handle 302 correctly.But CacheDataSource.getUri() will just return the original uri, which is wrong.

• The version of ExoPlayer is r2.1.1.

[cr1944]

I have send a test url to dev.exoplayer@gmail.com