THIS REQUEST GIVES A 200 RESPONSE

GET http://valve65.cs.steampowered.com/broadcast/5491896056949521334/segment/audio/1/init/?broadcast_origin=br02.broadcast.sto.steamstatic.com:80 HTTP/1.1
Host: valve65.cs.steampowered.com
Connection: keep-alive
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.103 Safari/537.36
Origin: http://steamcommunity.com
Accept: */*
Referer: http://steamcommunity.com/broadcast/watch/76561198070899116
Accept-Encoding: gzip, deflate, sdch
Accept-Language: en-CA,en;q=0.8,en-US;q=0.6

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THIS REQUEST GIVES A 404 RESPONSE

GET http://valve65.cs.steampowered.com/broadcast/5491896056949521334/segment/audio/1/525/?broadcast_origin=br02.broadcast.sto.steamstatic.com:80 HTTP/1.1
Host: valve65.cs.steampowered.com
Connection: keep-alive
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.103 Safari/537.36
Origin: http://steamcommunity.com
Accept: */*
Referer: http://steamcommunity.com/broadcast/watch/76561198070899116
Accept-Encoding: gzip, deflate, sdch
Accept-Language: en-CA,en;q=0.8,en-US;q=0.6