CodeIgniter htaccess mod_rewrite无法正常工作

I'm trying to make the url into http://127.0.0.1/dev/blog/welcome but when I type that it changes the url to http://127.0.0.1/dev/blog/index.php/welcome

But When I do http://127.0.01/dev/blog//welcome it stays like that for some reason.

my .htaccess is

RewriteEngine On
RewriteBase /dev/blog
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond $1 !^(index\.php|images|robots\.txt|css)
RewriteRule ^(.*)$ index.php?/$1 [L]

and my config.php is configured

$config['base_url'] = 'http://127.0.0.1/dev/blog/';
$config['index_page'] = '';

Oh, and I did check if mod_rewrite is on and I'm using WAMP

Another info: I'm using Firefox but when I use IE(9) It doesn't change the url from http://127.0.0.1/dev/blog/welcome to http://127.0.0.1/dev/blog/index.php/welcome

For your RewriteRule, add the NC and QSA flags. The QSA ensures that query strings are appended. Unless you are planning on CodeIgniter manage your css files, images, and robots.txt, leave out the penultimate line too.

Try this:

RewriteEngine On
RewriteBase /dev/blog/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [NC,L,QSA]

Also, check your uri_protocol in config.php. I've had some problems with WAMP not detecting it properly, and have had the most luck with setting it to PATH_INFO instead of AUTO.

Make sure you are editing the file on your webroot dir and not on the application dir. I've struggled a little bit while trying to get this to work properly until I finally figured that was my problem

Do you have set AcceptPathInfo to ON in your apache configuration?