feat: use destination path as prefix when rewritting url

internal/proxy/director/director.go

@@ -70,6 +70,7 @@ MAIN:
 
 	r.URL.Host = toURL.Host
 	r.URL.Scheme = toURL.Scheme
+	r.URL.Path = toURL.JoinPath(r.URL.Path).Path
 
 	ctx = logger.With(ctx,
 		logger.F("proxy", match.Name),
@@ -77,6 +78,11 @@ MAIN:
 		logger.F("remoteAddr", r.RemoteAddr),
 	)
 
+	logger.Debug(
+		ctx, "rewritten url",
+		logger.F("rewrittenURL", r.URL.String()),
+	)
+
 	metricProxyRequestsTotal.With(prometheus.Labels{metricLabelProxy: string(match.Name)}).Add(1)
 
 	ctx = withProxy(ctx, match)