diff --git a/examples/shrpx_downstream.cc b/examples/shrpx_downstream.cc
index 0d5517c..89496d6 100644
--- a/examples/shrpx_downstream.cc
+++ b/examples/shrpx_downstream.cc
@@ -270,16 +270,17 @@ int Downstream::push_request_headers()
   std::string via_value;
   for(Headers::const_iterator i = request_headers_.begin();
       i != request_headers_.end(); ++i) {
-    if(util::strieq((*i).first.c_str(), "X-Forwarded-Proto")) {
+    if(util::strieq((*i).first.c_str(), "X-Forwarded-Proto") ||
+       util::strieq((*i).first.c_str(), "host") ||
+       util::strieq((*i).first.c_str(), "keep-alive") ||
+       util::strieq((*i).first.c_str(), "connection") ||
+       util::strieq((*i).first.c_str(), "proxy-connection")) {
       continue;
     }
     if(util::strieq((*i).first.c_str(), "via")) {
       via_value = (*i).second;
       continue;
     }
-    if(util::strieq((*i).first.c_str(), "host")) {
-      continue;
-    }
     if(util::strieq((*i).first.c_str(), "expect") &&
        util::strifind((*i).second.c_str(), "100-continue")) {
       continue;