Nginx: WS upgrade breaks for Android OS < 5 -

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i using nginx wss ws forwarding. ws server running on chrome-android (the debugging port). ws server runs fine when tested independently. want wss request.
able run same android mobiles having os >= 5.0.
doesn't work android mobile having os < 5.0.

when tcp-dump on ws port, same request being sent nginx in both cases: android >=5 , android < 5. android phone version < 5 gives "404 response".

i think nginx http -> ws upgrade might not working properly.

my nginx.conf file http://pastebin.com/ncyg0xbv .

kindly mention if going wrong somewhere.


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