fix redir stuff i hope

conf.yaml

@@ -1,11 +1,11 @@
 p: 54243
 r: 
 - echo:http://localhost:49982
-- echo2:http://localhost:49983
-crt: ./testdata/rproxy3server.crt
-key: ./testdata/rproxy3server.key
-user: bel
-pass: bel
+- echo2:http://192.168.0.86:38090
+#crt: ./testdata/rproxy3server.crt
+#key: ./testdata/rproxy3server.key
+#user: bel
+#pass: bel
 rate: 1
 burst: 2
 timeout: 10

server/proxy.go

@@ -9,8 +9,17 @@ import (
 	"strings"
 )
 
+type redirPurge struct {
+	proxyHost  string
+	targetHost string
+}
+
 func (s *Server) Proxy(w http.ResponseWriter, r *http.Request) {
 	newURL, err := s.lookup(r.Host)
+	transport := &redirPurge{
+		proxyHost:  r.Host,
+		targetHost: newURL.Host,
+	}
 	if err != nil {
 		http.NotFound(w, r)
 		log.Printf("unknown host lookup %q", r.Host)
@@ -18,6 +27,7 @@ func (s *Server) Proxy(w http.ResponseWriter, r *http.Request) {
 	}
 	r.Host = newURL.Host
 	proxy := httputil.NewSingleHostReverseProxy(newURL)
+	proxy.Transport = transport
 	proxy.ServeHTTP(w, r)
 }
 
@@ -28,3 +38,14 @@ func (s *Server) lookup(host string) (*url.URL, error) {
 	err := s.db.Get(nsRouting, host, v)
 	return v.URL(), err
 }
+
+func (rp *redirPurge) RoundTrip(r *http.Request) (*http.Response, error) {
+	resp, err := http.DefaultTransport.RoundTrip(r)
+	if err != nil {
+		return resp, err
+	}
+	if loc := resp.Header.Get("Location"); loc != "" {
+		resp.Header.Set("Location", strings.Replace(loc, rp.targetHost, rp.proxyHost, 1))
+	}
+	return resp, err
+}