ReverseProxyFilter does not take into account the possibility that geoserver will be the root applications

ReverseProxyFilter.class appears to do a search and replace on the geoserver output, that does not take into account that someone may want to run the geoserver in a root context, instead of the default geoserver/ context. When it compares the base url to the / in an ending html tag (</a> for instance), it thinks it needs to replace it. </a> becomes </geoserver/a> and breaks output.