.htaccess - Codeigniter Remove index.php from Browser Url -

i want create app url 'http://example.com'. entering url, shows 'http error 403.14 - forbidden'. when have inserted 'index.php' @ last of url 'http://example.com/index.php' landing page rendering in browser have changed

$config['base_url'] = 'http://example.com';  $config['index_page'] = ''; 

and

$config['uri_protocol'] = 'request_uri'; 

in config.php file. have placed .htaccess file in codeigniter root folder along application , system folder. in .htaccess file have coded

<ifmodule mod_rewrite.c> rewriteengine on rewritecond %{request_filename} !-f rewritecond %{request_filename} !-d rewriterule ^(.*)$ index.php/$1 [l]  </ifmodule> 

i want remove 'index.php' url. using iis 8.5 web server.

  htaccess file   rewriteengine on   rewritecond $1 !^(index\.php|resources|robots\.txt)   rewritecond %{request_filename} !-f   rewritecond %{request_filename} !-d   rewriterule ^(.*)$ index.php?/$1 [l]    site working http://demo.crowdfundingscript.com/    config file   $config['uri_protocol']   = 'auto';    $config['index_page'] = '';