Nginx: redirect non-www to www address‏

Problem (example):
I want to redirect all user request whether it is from http://mp32u.net or http://www.mp32u.net to http://www.mp32u.net . (This method usually used as one of SEO effort).
Nginx didn’t know .htaccess

Cause:
nginx has it’s own rewrite module and method.

Solution:
This is an example server block that will solve the problem:

    server {
        listen 80;
        server_name mp32u.net www.mp32u.net;

        # this is the nginx redirection from non-www to www example
        if ($host = 'mp32u.net') {
            rewrite ^(.*) http://www.mp32u.net/$1 permanent;
        }

        # bla bla bla bla ... other settings such as root, index, location.. etc.
        #[.........]
    }

As you can see, those server block will handle request that has mp32u.net and www.mp32u.net in its HTTP_HOST.
The if block will check if the HTTP_HOST is exact match to ‘mp32u.net’, if it’s true then user will be redirected to ‘www.mp32u.net’ and the same server block will handle this request. Quite simple isn’t it?

Notes: Of course, now, mp32u.net did not use nginx as it’s web server after I noticed the server load is sky high when using nginx compared to when using apache2

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