nginx chunked transfer encoding fails

I am using an implemention of nginx with jetty servlets.

For the purpose of my project I need to initialize two connection to the jetty servlet and keep them open. To initialize the downlink I use a normal request and I get the inputstream back. To initialize the uplink I use a chunked encoding request.

I use a 1.4.6 nginx version so the chunked encoding should be set by default, regardless I set it in my server definition.

 #HTTPS server

server {
    listen 443;
    listen [::]:443;
    server_name  localhost;

    ssl                  on;
    ssl_certificate      /etc/nginx/ssl/server.crt;
    ssl_certificate_key  /etc/nginx/ssl/server.key;

    ssl_session_timeout  5m;

    ssl_protocols  SSLv2 SSLv3 TLSv1;
    ssl_ciphers  HIGH:!aNULL:!MD5;
    ssl_prefer_server_ciphers   on;
    location / {
        proxy_http_version 1.1;
        expires off;
        proxy_buffering off; 
        chunked_transfer_encoding on;
        proxy_pass      https://127.0.0.1:8080;
    #    root   html;
    #    index  index.html index.htm;
    }
}

I've searched through all the forums and I still can't come across a solution. Enabled chunked encoding, proxy buffering off etc etc. I can't get it to work. I have also done simple tests to make that it's not my apps implementation that's blocking it somehow and it still doesn't work.

Anything else I can try?

So I also posted on the nginx forum and I got a reply. The thing I am specifically looking for is called "unbuffered upload" and that is currently a feature that nginx does not provide.

Using websockets is out of the question because later this prototype will need to be implement in a bigger and older system that uses the http protocol. So the answer for this would be it's not possible with "nginx". A possible work around for anyone facing the same issue is using tengine which is an nginx fork.

Update

Unbuffered upload was added to NGINX in 2015, https://www.nginx.com/blog/nginx-plus-r6-released/#unbuffered-upload.