SVN, TRAC and web with Nginx and Apache

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http://serverfault.com – I have SVN, TRAC and Web server installed in my server. SVN and TRAC services are configured on Apache, listening 81 port, http://localhost:81/svn and http://mylocalhost:81/trac. Web server is NGINX, listening 80 port. I would like to configure nginx to allow access to SVN and TRAC using http://localhost/svn and http://localhost/trac. (HowTos)