title: RewriteRule with an IPv6 IP address does not work
body: <p>I am having problems to proxy requestions inside a IPv6 address.</p>
  
  <p>On .htaccess/apache2.conf, I have it:</p>
  
  <p><code>RewriteRule (.*) http://18.4.15.8:80/path/$1 [P,L]</code></p>
  
  <p>It works fine, because it is a IPv4 address.
  But, it does not works:</p>
  
  <p><code>RewriteRule (.*) http://[27:ec:20:22:15::d3]:80/path/$1 [P,L]</code></p>
  
  <p>Why?</p>
  
  <p>Error Log:</p>
  
  <blockquote>
    <p>Proxy Error</p>
    
    <p>Your browser sent a request that this server could not understand.
    The proxy server could not handle the request GET /index.html.</p>
    
    <p>Reason: URI cannot be parsed: <a href="http://%5b27:ec:20:22:15::d3%5d:80/path/index.html" rel="nofollow noreferrer">http://%5b27:ec:20:22:15::d3%5d:80/path/index.html</a></p>
  </blockquote>