func compressionFilter(req *restful.Request, resp *restful.Response, chain *restful.FilterChain) {
// wrap responseWriter into a compressing one
compress, err := restful.NewCompressingResponseWriter(resp.ResponseWriter, restful.ENCODING_GZIP)
if err != nil {
glog.Warningf("Failed to create CompressingResponseWriter for request %q: %v", req.Request.URL, err)
return
}
resp.ResponseWriter = compress
defer compress.Close()
chain.ProcessFilter(req, resp)
}