From a8a8bef4dbd0c4b123f4f543bfe8483e3a3928a0 Mon Sep 17 00:00:00 2001
From: Vladislav Yarmak <vladislav@vm-0.com>
Date: Sun, 24 May 2020 16:11:50 +0300
Subject: [PATCH] filter requests

---
 handler.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/handler.go b/handler.go
index c7c1f16..04ec71f 100644
--- a/handler.go
+++ b/handler.go
@@ -87,6 +87,11 @@ func (s *ProxyHandler) HandleRequest(wr http.ResponseWriter, req *http.Request)
 
 func (s *ProxyHandler) ServeHTTP(wr http.ResponseWriter, req *http.Request) {
 	s.logger.Info("Request: %v %v %v %v", req.RemoteAddr, req.Proto, req.Method, req.URL)
+    if ((req.URL.Host == "" || req.URL.Scheme == "") && req.ProtoMajor < 2) ||
+        (req.Host == "" && req.ProtoMajor == 2) {
+        http.Error(wr, "Bad Request", http.StatusBadRequest)
+        return
+    }
     if !s.auth.Validate(wr, req) {
         return
     }