Full pathname not sent

[Doc]

This might be more of a regex problem on my part than nginx. I do a 
rewrite to pass the full pathname to thttpd like this:

location ~ /radio/download/.*\.mp3$ {
     rewrite ^ /test/$1;
}

location /test {
     proxy_pass http://127.0.0.1:8000;
}

However the pathname received by thttpd is /test/ without the mp3 
filename.
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