The upstream CDN intermittently serves 0 bytes on segments for 10s+
(fragLoadTimeOut errors 17:58-18:14 and 19:16-19:18 today). hls.js's
default 5s time-to-first-byte abort dropped the XHR before the proxy's
12s upstream attempt + 300ms retry could answer with its 502, so the
proxy-side retry never got a chance and stalls went straight to fatal.
fragLoadPolicy: maxTimeToFirstByteMs 15000 (> proxy's 12s timeout),
maxNumRetry 8 — slow-but-alive segments now finish, and stall tolerance
rises to several minutes.
jozamudi
8f519b0251