How to redirect using .htaccess using Apache? - .htaccess

Question

Please help me to redirect using .htaccess like below.
http://info.domainname.com/blog/?Tag=somedynamictag
to
http://domainname.com/tag/somedynamictag
Thanks!

Answer 1

First of all I don't understand the purpose of rewriting http://info.domainname.com/blog/?Tag=somedynamictag to http://domainname.com/tag/somedynamictag when it had to be the other way round. People rewrite URLs to clean them (ie. remove characters like ?,&,=, etc.) but you are adding all these and making the URLs cumbersome.
I think you didn't properly understand the concept of URL rewriting. Let me explain a little.
When any URL is accessed on your website, the URL that the USER types or clicks (in your case http://domainname.com/tag/somedynamictag) is rewritten. But your question tells me that you think the other way. Your understanding is that the visitor clicks http://info.domainname.com/blog/?Tag=somedynamictag and will be rewritten to http://domainname.com/tag/somedynamictag. THIS IS WRONG!!. If you set up your website this way, each and every URL at http://domain.com/ must exist as a separate file or directory which a dynamic website like you seem to be developing is not expected to have. So I assume you have understood that you have either misformed the question or you have you have misunderstood the concept of URL rewriting. Following is the .htaccess code to redirect http://domainname.com/tag/somedynamictag to http://info.domainname.com/blog/?Tag=somedynamictag.
RewriteEngine On
RewriteCond %{HTTP_HOST} domainname.com
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^([A-Za-z0-9]+)\/(.*)$ http://info.domainname.com/blog/?$1=$2 [L,R=301]
If you think you have correctly typed the question and understood url-rewriting right and are sure what you are trying to do is right, then here's the htaccess code (if you want to redirect http://info.domainname.com/blog/?Tag=somedynamictag to http://domainname.com/tag/somedynamictag).
RewriteEngine On
RewriteCond %{HTTP_HOST} info.domainname.com
RewriteRule ^blog\/\?([A-Za-z0-9]+)=(.*)$ http://domainname.com/$1/$2 [L,R=301]
If that doesn't work, in index.php at http://info.domainname.com/blog/, place the following code:
<?php
header("HTTP/1.1 301 moved permanently");
header("Location:http://domainname.com/blog/tag/".$_GET['Tag']);
?>
And thank you for asking this question. While answering it, I learned many things.
Hope that answers your question,
Peace...