>
> The message indicate that upstream server returned invalid
> response, or at least nginx thinks it is invalid. If you think
> that response returned is valid, it's good idea to actually
> provide what was returned, as well as nginx's debug log.
>
>
> --
> Maxim Dounin
> http://nginx.org/


Thank you.
You were right. It turned out JBoss (or one of its components) gave a
strange response in HTTP 1.1 chunked transfer... but without chunk sizes.
I solved it by adding these two directives:

+ proxy_http_version 1.1;
+ proxy_set_header Connection "";
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