Support body rewrite

config/config.go

@@ -87,16 +87,21 @@ func GetTimeout() int {
 	return timeout
 }
 
-func GetRewrites() map[string]string {
+func GetRewrites(hostMatch string) map[string]string {
 	v := packable.NewString()
 	conf.Get(nsConf, flagRewrites, v)
 	m := make(map[string]string)
 	for _, v := range strings.Split(v.String(), ",") {
-		if len(v) == 0 {
-			return m
+		vs := strings.Split(v, ":")
+		if len(v) < 3 {
+			continue
 		}
-		from := v[:strings.Index(v, ":")]
-		to := v[strings.Index(v, ":")+1:]
+		host := vs[0]
+		if host != hostMatch {
+			continue
+		}
+		from := vs[1]
+		to := strings.Join(vs[2:], ":")
 		m[from] = to
 	}
 	return m