Feedproxy is a simple and lightweigt proxy to host modified versions of rss feeds.
Some feeds only provide links to articles, some pages have no feed at all and some do strange stuff (looking at you, “Cached by Wordpress plugin xy” message which breaks the parser of my reader).
This proxy can be hosed aside with a selfhosted feed reader (TinyTinyRSS, Miniflux, etc.) to fix feeds which no not fullfill the own expectations.
The feeds are accessible from any subfolder, thereby an arbitrary unused path of another host (e.g. a selfhosted feedreader) can be routed to the proxy to host the modified feeds.