> Never mind there's nothing wrong with nginx here.
> It was one of the response headers sent by an upstream server
> (mainly Content-Description: 2013923 10H56M56S633_PV.doc�) including
> this non-ascii char '?' which the nginx didn't like and hence flagged
> it saying that it received an invalid header.
Thanks for confirming.
Nginx does the right thing here, headers must not contain non-ascii chars
per RFC.
Regards,
Lukas
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