nginx

        location /sdrbuffer/ {
                proxy_pass http://172.16.0.90:80/;
                #include /etc/nginx/proxy_params;
                proxy_http_version 1.1;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection "upgrade";
                proxy_set_header        Host            $host;
                proxy_set_header        X-Real-IP       $remote_addr;
                proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header        X-Forwarded-Proto $scheme;
                proxy_redirect          off;
                proxy_cache             off;
                proxy_buffers           32 16k;
                proxy_busy_buffers_size 64k;
                client_max_body_size    0;
                proxy_request_buffering off;
                fastcgi_keep_conn on; # < solution

                proxy_buffering off;
                gzip off; 
	}


        location /save1/ { 
                proxy_pass http://172.16.0.90:7070/;
                include /etc/nginx/proxy_params;
                proxy_http_version 1.1;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection "upgrade";
                proxy_set_header        Host            $host;
                proxy_set_header        X-Real-IP       $remote_addr;
                proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
                proxy_set_header        X-Forwarded-Proto $scheme;
                proxy_cache             off;
        }