php - Nginx $http_x_requested_with is empty -

why nginx doesn't return $http_x_requested_with when im making ajax request ? did need module compiled nginx make work ?

how can detect otherwise if request ajax in php-fpm ?

fastcgi_params:

fastcgi_param  script_filename    $document_root$fastcgi_script_name; fastcgi_param  query_string       $query_string; fastcgi_param  request_method     $request_method; fastcgi_param  content_type       $content_type; fastcgi_param  content_length     $content_length;  fastcgi_param  script_name        $fastcgi_script_name; fastcgi_param  request_uri        $request_uri; fastcgi_param  document_uri       $document_uri; fastcgi_param  document_root      $document_root; fastcgi_param  server_protocol    $server_protocol; fastcgi_param  request_scheme     $scheme; fastcgi_param  https              $https if_not_empty;  fastcgi_param  gateway_interface  cgi/1.1; fastcgi_param  server_software    nginx/$nginx_version;  fastcgi_param  remote_addr        $remote_addr; fastcgi_param  remote_port        $remote_port; fastcgi_param  server_addr        $server_addr; fastcgi_param  server_port        $server_port; fastcgi_param  server_name        $server_name;  # php only, required if php built --enable-force-cgi-redirect fastcgi_param  redirect_status    200; fastcgi_param  http_x_requested_with   $http_x_requested_with; 

vhost conf:

server {     listen 80;     server_name suzuki.sidormedia.pl;     return 301 http://www.suzuki.sidormedia.pl$request_uri; }  server {     gzip on; gzip_disable "msie6";  gzip_comp_level 6; gzip_min_length 1100; gzip_buffers 16 8k; gzip_proxied any; gzip_types     text/plain     text/css     text/js     text/xml     text/javascript     application/javascript     application/x-javascript     application/json     application/xml     application/rss+xml     image/svg+xml;     listen 80;     index index.php index.html index.htm;     server_name www.suzuki.sidormedia.pl;     access_log /var/www/suzuki/app/logs/suzuki-access.log combined;     error_log /var/www/suzuki/app/logs/suzuki-error.log error;     set $root_path '/var/www/suzuki/public/';     root $root_path;      add_header 'access-control-allow-credentials' 'true';      add_header 'access-control-allow-origin' "http://www.suzuki.sidormedia.pl";       try_files $uri $uri/ @rewrite;      location @rewrite {         rewrite ^/(.*)$ /index.php?_url=/$1;     }       location ~ \.php$ {             try_files $uri =404;             fastcgi_split_path_info ^(.+\.php)(/.+)$;             fastcgi_pass unix:/var/run/php/php7.0-fpm.sock;             fastcgi_index index.php;             fastcgi_param  script_filename  $document_root$fastcgi_script_name;             include fastcgi_params;             fastcgi_buffer_size 512k;             fastcgi_buffers 512 32k;             fastcgi_busy_buffers_size 512k;             fastcgi_temp_file_write_size 512k;     }      location ~* \.(?:manifest|appcache|html?|xml|json)$ {   expires -1;   # access_log logs/static.log; # don't include static log }  # feed location ~* \.(?:rss|atom)$ {   expires 1h;   add_header cache-control "public"; }  # media: images, icons, video, audio, htc location ~* \.(?:jpg|jpeg|gif|png|ico|cur|gz|svg|svgz|mp4|ogg|ogv|webm|htc)$ {   expires 1m;   access_log off;   add_header cache-control "public"; }  # css , javascript location ~* \.(?:css|js)$ {   expires 1y;   access_log off;   add_header cache-control "public"; } } 

i dont know how post answer post answer, (mods?)

does $_server['http_x_requested_with'] exist in php or not?