reverse proxy removes Transfer-Encoding: chunked

[Pommi]

I'm trying to setup a nginx (1.4.1) reverse proxy to a HornetQ API using
this configuration:

proxy_http_version 1.1;
proxy_set_header Host $host;
upstream app {
    server 127.0.0.1:8000;
    keepalive 8;
}
server {
    listen 0.0.0.0:7000;
    server_name localhost;
    location / { deny all; }
    location = /messaging/ {
        proxy_pass http://app/messaging/;
        proxy_buffering off;
    }
}

After a lot of tcpdumping I see that that nginx removes the
Transfer-Encoding header and sets the Content-Length header in place of it,
which the length of the first 'chunk'. After that the connection gets
reset.

When sending the following headers:

POST /messaging/ HTTP/1.1
Host: localhost
Content-Type: application/octet-stream
Transfer-Encoding: chunked
Content-Transfer-Encoding: binary
User-Agent:
org.jboss.netty.channel.socket.http.HttpTunnelingClientSocketChannel

nginx will forward them like:

POST /messaging/ HTTP/1.1
Host: localhost
Content-Length: 60
Content-Type: application/octet-stream
Content-Transfer-Encoding: binary
User-Agent:
org.jboss.netty.channel.socket.http.HttpTunnelingClientSocketChannel

Is this normal behaviour?

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,243073,243073#msg-243073