apache - Redirect does not work? -

i have problem in apache config. on localhost

return $this->redirect('ex::dashboard');  

executes perfectly.

but when upload code server. terminates blank page.

what reason? tried debug.. no success.

i have access of server , checked of php parameters.

'./configure' '--disable-fileinfo' '--disable-pdo' '--enable-bcmath'  '--enable-calendar' '--enable-exif' '--enable-ftp' '--enable-gd-native-ttf'  '--enable-libxml' '--enable-mbstring' '--enable-soap' '--enable-sockets'  '--enable-zip' '--prefix=/usr/local' '--with-apxs2=/usr/local/apache/bin/apxs'  '--with-curl=/opt/curlssl/' '--with-freetype-dir=/usr'  '--with-gd' '--with-imap=/opt/php_with_imap_client/' '--with-imap-ssl=/usr'  '--with-jpeg-dir=/usr' '--with-kerberos' '--with-libdir=lib64'  '--with-libxml-dir=/opt/xml2' '--with-libxml-dir=/opt/xml2/'  '--with-mcrypt=/opt/libmcrypt/' '--with-mysql=/usr'  '--with-mysql-sock=/var/lib/mysql/mysql.sock' '--with-openssl=/usr'  '--with-openssl-dir=/usr' '--with-pcre-regex=/opt/pcre'  '--with-pic' '--with-png-dir=/usr' '--with-xpm-dir=/usr'  '--with-zlib' '--with-zlib-dir=/usr'  

there 1 difference in

localhost

server api  apache 2.4 handler apache lounge  

dedicated server

server api  cgi/fastcgi  

will make difference?

the code:

https://github.com/nilamdoc/vc.co.uk/blob/master/app/controllers/sessionscontroller.php#l33 

at l33 should redirect dashboard page

i tried

header('location: https://' . $_server['server_name']."/ex/dashboard"); 

but did not redirect

given following:

i tried

header('location: https://' . $_server['server_name']."/ex/dashboard");

but did not redirect

...this not lithium question.

are sure it's apache? this:

server api  cgi/fastcgi 

...does not seem indicate.