basic auth in http server

proxy/http/config.go

@@ -1 +1,13 @@
 package http
+
+func (sc *ServerConfig) HasAccount(username, password string) bool {
+	if sc.Accounts == nil {
+		return false
+	}
+
+	p, found := sc.Accounts[username]
+	if !found {
+		return false
+	}
+	return p == password
+}