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There are lot of installation methods available, which one is best and help to upgrade future versions as well as extension. Centos 7, Nginx

I have a problem with my rest service as below: 1. a server with NGinx, PHP-FPM, provide rest service: example: http://example.com/rest.php, this link only show content: 1001:Successfully 2. another server using curl call this rest service to get content. With happy case, it must get content from rest service is 1001:Successfully. But problem happen - In most case it get content ok, but sometimes I get empty content while http_status is 200 ok. I don't know what is happening. Could anyone help me? Empty content and CURL debug information as below: '* About to connect() to example.com port 80 (#0) * Trying xxx.xxx.xxx.xxx... * connected * Connected to example.com (xxx.xxx.xxx.xxx) port 80 (#0) > GET /rest.php HTTP/1.1 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; rv:1.7.3) Gecko/20041001 Firefox/0.10.1 Host: example.com Accept: */* Accept-Encoding: deflate, gzip < HTTP/1.1 200 OK < Server: XXX < Date: Mon, 12 May 2014 12:58:17 GMT < Content-Type: text/html < Transfer-Encoding: chunked < Connection: keep-alive < * Connection #0 to host channel.ssgroup.vn left intact * Closing connection #0 ', )

I am confuse of web server and application server and looking for the solution. It would be great if someone explain me detail about the differences and use of the appserver.

I'm trying to proof a comet style page and to start it up I thought I would set a simple counter in PHP to output 0->3 with a one second delay between each output and flush it to screen each second. Problem is nothing I have tried has actualy managed to flush the buffer out. It just sits there with the loading spinner and after 4 seconds dumps the lot onto the screen at once. I have been diging about and have set the nginx config to the following: user www-data; worker_processes 1; error_log /var/log/nginx/error.log; pid /var/run/nginx.pid; events { worker_connections 1024; multi_accept on; } http { include /etc/nginx/mime.types; access_log /var/log/nginx/access.log; sendfile on; tcp_nopush on; #keepalive_timeout 0; keepalive_timeout 65; tcp_nodelay on; #---------------------------------------------- # fastcgi_keep_conn on; proxy_buffering off; gzip off; #---------------------------------------------- gzip_disable "MSIE [1-6]\.(?!.*SV1)"; include /etc/nginx/conf.d/*.conf; include /etc/nginx/sites-enabled/*; } I had to comment out the fastcgi_keep_con on; as this wasn't recognised. The following is the PHP page. <?php ini_set('zlib.output_compression', 'Off'); ini_set('output_handler',""); ini_set('implicit_flush',1); set_time_limit(0); ob_start(); header("Cache-Control: no-cache, must-revalidate"); flush(); ob_flush(); for ($i=0;$i<4;$i++) { echo "$i <br>"; ob_flush(); flush(); sleep(1); } ob_end_clean(); ?> Any ideas what I'm missing here?