PDF file not showing or downloading in nginx server -

i've been searching day, not founding solution. here's problem: vm running ubuntu nginx server php apps. application works fine except cant see or download pdf files in browser.

i'll try describe of configuration me solve problem:

nginx 1.6.2 php 5.5.26

my /etc/nginx/nginx.conf:

user www-data; worker_processes 1; worker_rlimit_nofile 1024; error_log  /var/log/nginx/error.log; pid        /var/run/nginx.pid;  events {   worker_connections 1024; }  http {   include       /etc/nginx/mime.types;   default_type  application/octet-stream;   access_log  /var/log/nginx/access.log;   sendfile    on;   server_tokens on;   types_hash_max_size 1024;   types_hash_bucket_size 512;   server_names_hash_bucket_size 64;   server_names_hash_max_size 512;    keepalive_timeout  65;   tcp_nodelay        on;    gzip         on;   gzip_disable "msie [1-6]\.(?!.*sv1)";    include /etc/nginx/conf.d/*.conf;   include /etc/nginx/sites-enabled/*;  } 

my /etc/nginx/sites-available/app.conf:

server {     listen    80;     server_name   app.dev;     client_max_body_size 1m;     root /_dev/www/app.com.br/public_html;     index  index.html index.htm index.php;     charset   utf-8;      access_log    /etc/nginx/www.access.log;     error_log     /etc/nginx/www.error.log;      location / {        root  /_dev/www/app.com.br/public_html;       try_files $uri $uri/ index.php;       index  index.html index.htm index.php;     }      location ~ \.php$ {        root  /_dev/www/app.com.br/public_html;       fastcgi_index index.php;       fastcgi_split_path_info ^(.+\.php)(/.*)$;       try_files $uri $uri/ index.php /index.php$is_args$args;       include /etc/nginx/fastcgi_params;       fastcgi_pass 127.0.0.1:9000;       fastcgi_param script_filename $request_filename;       fastcgi_param app_env dev;    }      location ~* (.*\.pdf) {         types { application/octet-stream .pdf; }         default_type application/octet-stream;     }      sendfile off;   } 

when click button triggers script pdf file response headers are:

cache-control:private, must-revalidate, post-check=0, pre-check=0, max-age=1 connection:keep-alive content-description:file transfer content-disposition:attachment; filename="romaneio.pdf" content-transfer-encoding:binary content-type:application/pdf date:thu, 18 jun 2015 21:59:18 gmt expires:sat, 26 jul 1997 05:00:00 gmt last-modified:thu, 18 jun 2015 21:59:18 gmt pragma:public server:nginx/1.6.2 transfer-encoding:chunked 

but browser doesn't open or download it. can ? thank !

edit: console log took ajax response shows bunch of stuff, seems pdf file code, why reason browser doesn't open or download ?

edit 2: well, after thorough research found tcpdf doesn't work ajax calls, idea on pdf library allows ajax calls ?