if DEBUG then extra log

config.go

@@ -9,6 +9,8 @@ import (
 	"gopkg.in/yaml.v2"
 )
 
+var debug = os.Getenv("DEBUG") != ""
+
 type (
 	Config struct {
 		Cert    Cert

main.go

@@ -107,6 +107,9 @@ func (c Config) serveHTTPProxy(w http.ResponseWriter, r *http.Request, endpoint
 			u3 := *u
 			u3.Path = "/"
 			r2.Header.Set("Origin", u3.String())
+			if debug {
+				log.Printf("r2.Header[Origin] = %q", r2.Header.Get("Origin"))
+			}
 			return nil
 		})
 		if err != nil {
@@ -177,6 +180,9 @@ func (c Config) endpoint(r *http.Request) Endpoint {
 	key := c.key(r)
 	domain := strings.Split(strings.TrimPrefix(r.Host, key), ":")[0]
 	m, ok := c.Domains[domain]
+	if debug {
+		log.Printf("[%s][%s] = %+v", key, domain, m[key])
+	}
 	if !ok {
 		return Endpoint{}
 	}