mangui/flashls

relative paths in playlist are broken by 302 redirect

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#261 opened on Apr 28, 2015

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help wanted

Description

What:
Relative paths in m3u8s are wrong if manifest result of redirect.

Steps: Create a rewrite rule which redirects any path to an externally hosted m3u8 which contains relative paths (anything not in the same directory).

Expect: URIs in the playlist are resolve relative to the redirect target url.

Actual: URIs are being resolved relative to the pre-redirect base, which 404.

Specs are a bit hard to read on this. The HLS spec calls out:

3.1: A URI in a Playlist, whether it is a URI line or part of a tag, MAY be relative. Relative URIs MUST be resolved against the URI of the Playlist file that contains it.

While the URI spec:

5.1.3. Base URI from the Retrieval URI ...if the retrieval was the result of a redirected request, the last URI used (i.e., the URI that resulted in the actual retrieval of the representation) is the base URI.

More importantly, I've tested against Safari and iOS and they both use the redirect results as base.

This is a bit of a corner case and probably one I can patch for you, but wanted to record it here. URLLoader should return the redirect target in the HTTPStatusEvent, if that's available for our runtime. I'll look around.

Reproduced on v0.4.0.5 and v0.3.1.

Contributor guide

Tech stack
None
Domain
backend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Basic knowledge of HLSUnderstanding of URL resolution
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65
Research direction
Examine the URL loading mechanism in flashls to locate where the base URL for playlist resolution is set. The issue suggests that the redirect target is not being used as the base. Look for classes handling HTTP requests, likely using URLLoader, and ensure the final URL is captured and passed to the playlist parser. Test with a redirected m3u8 to verify the fix.