HLS #EXT-X-ALLOW-CACHE deprecated

[andrew867]

From Apple's mediastreamvalidator:

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SHOULD fix issues
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Warning: #EXT-X-ALLOW-CACHE has been deprecated
--> Detail:  Line: #EXT-X-ALLOW-CACHE:YES
--> Source:  hls/HLSTest.m3u8

It looks like it is hardcoded:

srs/trunk/src/app/srs_app_hls.cpp

Line 867 in a613eb7

 << "#EXT-X-ALLOW-CACHE:YES" << SRS_CONSTS_LF; 

Would be great to make an option in the HLS config to disable or enable output of that line in HLS m3u8 playlists.

[Winlin]

Why deprecated?

[Winlin]

Will it cause any problem? Or just a warning? Or is there any substitution for this field?

[Mark Beacom]

It appears that it was deprecated in v7 and removed from the draft in v14 https://tools.ietf.org/html/draft-pantos-http-live-streaming-14#section-7 with no direct replacement.

[Winlin]

It seems we can remove it.
I will remove it from SRS3.