.htaccess - Clean URL, 500 Internal Server Error - .htaccess

Question

I've got this as my .htaccess:
RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.php -f
RewriteRule ^(.*)$ $1.php
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.html -f
RewriteRule ^(.*)$ $1.html
# Where it's all about
RewriteRule ^users/([a-zA-Z0-9]+)$ users.php?user=$1
RewriteRule ^users/([a-zA-Z0-9]+)/$ users.php?user=$1
RewriteEngine On
RewriteCond %{HTTP_HOST} ^www.daltonempire.nl [nocase]
RewriteRule ^(.*)
http://daltonempire.nl/$1 [last,redirect=301]
I tried to make clean urls, redirecting daltonempire.nl/users/Me to daltonempire.nl/users.php?user=Me.
However, I failed miserably. My website now constantly returns a 500 Internal Server Error.
(I possibly somehow created a redirection loop?)
What did I do wrong? (And what do I have to do to fix it?)

Answer 1

Believe you have an extra newline in last rule. Also make sure to use L (Last) flag in all of your rules.
RewriteEngine on
# Where it's all about
RewriteRule ^users/([a-zA-Z0-9]+)/?$ users.php?user=$1 [L,QSA]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.php -f
RewriteRule ^(.+?)/?$ $1.php [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.html -f
RewriteRule ^(.+?)/?$ $1.html [L]
RewriteCond %{HTTP_HOST} ^www\.(daltonempire\.nl)$ [NC]
RewriteRule ^ http://%1%{REQUEST_URI} [L,R=301,NE]