How to prevent mod_proxy from rewriting redirects into absolute URLs?

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http://serverfault.com – I have: nginx (port 80) reverse-proxying to apache2 (port 88) reverse-proxying to a web app (port 5001). However, when the web app responds with a redirect like Location: /foo, apache2 rewrites this into Location: http://host.com:88/sub/foo, even though port 88 is publicly inaccessible. I'd like it to just redirect to the relative URL Location: /sub/foo. Any ideas? My apache config (using mod_proxy_http, mod_proxy_html, mod_substitute): <Location /notes/> Allow from all ProxyPass SetOutputFilter proxy-html ProxyPassReverse / ProxyHTMLURLM (HowTos)