force range request on proxy server

[badtzhou]

We used amazon S3 as upstream server. And it does not serve 'Accept-Ranges:
bytes' as respond header. So the nginx proxy server will not serve range
response even if the content has been completely cached on the proxy
server.
We tested on a upstream server that do serve 'Accept-Ranges: bytes' as
respond header. And proxy server was working proper by servering range
respond.
Is that the default behavior for nginx proxy. Is there a way to overwrite
it.

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,241394,241394#msg-241394