CodeIgniter mod_rewrite gives 404 error - php

Question

I have written a CodeIgniter application and I want to use mod_rewrite to clean up my URL's. I have installed the CodeIgniter application in htdocs/ci-intro/
Here is my .htaccess file:
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /ci_intro/
#Removes access to the system folder by users.
#Additionally this will allow you to create a System.php controller,
#previously this would not have been possible.
#'system' can be replaced if you have renamed your system folder.
RewriteCond %{REQUEST_URI} ^system.*
RewriteRule ^(.*)$ /index.php?/$1 [L]
#When your application folder isn't in the system folder
#This snippet prevents user access to the application folder
#Submitted by: Fabdrol
#Rename 'application' to your applications folder name.
RewriteCond %{REQUEST_URI} ^application.*
RewriteRule ^(.*)$ /index.php?/$1 [L]
#Checks to see if the user is attempting to access a valid file,
#such as an image or css document, if this isn't true it sends the
#request to index.php
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?/$1 [L]
</IfModule>
<IfModule !mod_rewrite.c>
# If we don't have mod_rewrite installed, all 404's
# can be sent to index.php, and everything works as normal.
# Submitted by: ElliotHaughin
ErrorDocument 404 /index.php
</IfModule>
I altered the config.php in CodeIgniter to the following:
$config['base_url'] = '';
$config['index_page'] = '';
Whenever I use my links to go to the about page I get a 404 message from CodeIgniter. The URL in my browser seems to be 'cleaned up' though (index.php is removed). This is the URL:
'http://localhost:8888/ci_intro/about'
Can anybody help me getting rid of the 404 error and actually directing the use to the about page?
OS: MAC OS X 10.8.2 (latest)
SERVER SOFTWARE: MAMP
PHP: 5.2.17
BROWSERS: Chrome & Safari (In both browsers this problem occurs)

Answer 1

Before reviewing your server configration, please try code below:
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /ci_intro/
#Removes access to the system folder by users.
#Additionally this will allow you to create a System.php controller,
#previously this would not have been possible.
#'system' can be replaced if you have renamed your system folder.
RewriteCond %{REQUEST_URI} ^system.*
RewriteCond %{REQUEST_URI} ^application.*
RewriteRule ^(.*)$ /index.php?/$1 [L]
#Checks to see if the user is attempting to access a valid file,
#such as an image or css document, if this isn't true it sends the
#request to index.php
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?/$1 [L]
</IfModule>
<IfModule !mod_rewrite.c>
# If we don't have mod_rewrite installed, all 404's
# can be sent to index.php, and everything works as normal.
# Submitted by: ElliotHaughin
ErrorDocument 404 /index.php
</IfModule>

Answer 2

try this...
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_URI} ^system.*
RewriteRule ^(.*)$ /Your_folder_Name/index.php?/$1 [L]
RewriteCond %{REQUEST_URI} ^application.*
RewriteRule ^(.*)$ /Your_folder_Name/index.php?/$1 [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ Your_folder_Name/index.php?/$1 [L]
</IfModule>

Answer 3

Coincidentally I am using the same configuration like yours, and end up it didn't really work no matter how i change it.
So I gave up changing it and tried another simplest setting.
Try this out, it works for me!! :)
<IfModule mod_rewrite.c>
RewriteEngine on
# If the start of the URL doesn't match one of these...
RewriteCond $1 !^(index\.php|robots\.txt|assets|cache|images|uploads)
# Route through index.php
RewriteRule ^(.*)$ index.php/$1 [L]

Answer 4

RewriteCond %{REQUEST_URI} ^system.*
probably isn't going to trigger, since REQUEST_URI starts with /. Try
RewriteCond %{REQUEST_URI} ^/system
Ditto for
RewriteCond %{REQUEST_URI} ^application.*
And does your system really want /index.php?/blah blah? It's going to expect a URL Query String after the ?.