// remove the prefix
				action.RegexRewrite = &matcher.RegexMatchAndSubstitute{
					Pattern: &matcher.RegexMatcher{
						Regex: fmt.Sprintf(`^%s(/?)(.*)`, regexp.QuoteMeta(out.Match.GetPathSeparatedPrefix())),
					},
					// hold `/` in case the entire path is removed
					Substitution: `/\2`,
				}
			} else {
				action.PrefixRewrite = uri
			}
		}
		if in.Rewrite.GetAuthority() != "" {