вам апстрим ответил 400, а nginx этот же код отдал вам

2014/12/17 09:24:47 [debug] 1784#0: *559212 http proxy status 400 "400
Bad Request"
2014/12/17 09:24:47 [debug] 1784#0: *559212 http proxy header:
"Server: Apache-Coyote/1.1"
2014/12/17 09:24:47 [debug] 1784#0: *559212 http proxy header:
"Content-Type: text/html;charset=utf-8"
2014/12/17 09:24:47 [debug] 1784#0: *559212 http proxy header:
"Content-Encoding: gzip"
2014/12/17 09:24:47 [debug] 1784#0: *559212 http proxy header: "Vary:
Accept-Encoding"
2014/12/17 09:24:47 [debug] 1784#0: *559212 http proxy header: "Date:
Wed, 17 Dec 2014 09:24:47 GMT"
2014/12/17 09:24:47 [debug] 1784#0: *559212 http proxy header:
"Connection: close"

2014-12-17 17:14 GMT+05:00 Kouki <nginx-forum@nginx.us>:
> Вот дебаг лог:
> http://pastebin.com/VErwupXm
>
> Posted at Nginx Forum: http://forum.nginx.org/read.php?21,255278,255556#msg-255556
>
> _______________________________________________
> nginx-ru mailing list
> nginx-ru@nginx.org
> http://mailman.nginx.org/mailman/listinfo/nginx-ru

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