set directive issues

[Victor Iggy]

set $full_uri "$host/$request_uri";
if ($full_uri ~* "(.*)\.fabulously40.com") {
    set $username_host $1;
    proxy_pass http://127.0.0.1:8089/view/blog/user/$username_host;
}

I am trying to set $full_uri to both the arguments in a location block.
However, $full_uri is always "/"

This is driving me nuts.

I am trying to map..  <username>.fabulously40.com to
fabulously40.com/view/blog/user/$username

If anyone can help?
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