Lighttpd proxy redirect by port

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http://serverfault.com – I'm really just starting out with lighttpd and I'm not sure how to configure this exactly. I'm wanting to take traffic and redirect to another server say "http://localhost/url_a/" and redirect the request and responses from that to "http://other_server:8080/" Another example would be "http://localhost/url_a/" going to "http://other_server:8081/url_b/" What exactly should I look into for accomplishing this? Thanks. (HowTos)