diff --git a/src/shrpx_http2_upstream.cc b/src/shrpx_http2_upstream.cc
index ed26e207..3c0c8d28 100644
--- a/src/shrpx_http2_upstream.cc
+++ b/src/shrpx_http2_upstream.cc
@@ -927,6 +927,10 @@ int Http2Upstream::downstream_read(DownstreamConnection *dconn) {
     if (rv == SHRPX_ERR_EOF) {
       return downstream_eof(dconn);
     }
+    if (rv == SHRPX_ERR_DCONN_CANCELED) {
+      downstream->pop_downstream_connection();
+      return 0;
+    }
     if (rv != 0) {
       if (rv != SHRPX_ERR_NETWORK) {
         if (LOG_ENABLED(INFO)) {
@@ -1163,8 +1167,10 @@ int Http2Upstream::send_reply(Downstream *downstream, const uint8_t *body,
 
   auto status_code_str = util::utos(downstream->get_response_http_status());
   auto &headers = downstream->get_response_headers();
+  auto nva = std::vector<nghttp2_nv>();
   // 2 for :status and server
-  auto nva = std::vector<nghttp2_nv>(2 + headers.size());
+  nva.reserve(2 + headers.size());
+
   nva.push_back(http2::make_nv_ls(":status", status_code_str));
 
   for (auto &kv : headers) {
diff --git a/src/shrpx_https_upstream.cc b/src/shrpx_https_upstream.cc
index 8857c670..f1c0b31a 100644
--- a/src/shrpx_https_upstream.cc
+++ b/src/shrpx_https_upstream.cc
@@ -800,6 +800,7 @@ int HttpsUpstream::send_reply(Downstream *downstream, const uint8_t *body,
   auto status_str =
       http2::get_status_string(downstream->get_response_http_status());
   output->append(status_str.c_str(), status_str.size());
+  output->append("\r\n");
 
   for (auto &kv : downstream->get_response_headers()) {
     if (kv.name.empty() || kv.name[0] == ':') {
diff --git a/src/shrpx_spdy_upstream.cc b/src/shrpx_spdy_upstream.cc
index ee66c228..f8d59ea1 100644
--- a/src/shrpx_spdy_upstream.cc
+++ b/src/shrpx_spdy_upstream.cc
@@ -600,6 +600,10 @@ int SpdyUpstream::downstream_read(DownstreamConnection *dconn) {
     if (rv == SHRPX_ERR_EOF) {
       return downstream_eof(dconn);
     }
+    if (rv == SHRPX_ERR_DCONN_CANCELED) {
+      downstream->pop_downstream_connection();
+      return 0;
+    }
     if (rv != 0) {
       if (rv != SHRPX_ERR_NETWORK) {
         if (LOG_ENABLED(INFO)) {
@@ -815,8 +819,9 @@ int SpdyUpstream::send_reply(Downstream *downstream, const uint8_t *body,
 
   auto &headers = downstream->get_response_headers();
 
+  auto nva = std::vector<const char *>();
   // 3 for :status, :version and server
-  auto nva = std::vector<const char *>(3 + headers.size());
+  nva.reserve(3 + headers.size());
 
   nva.push_back(":status");
   nva.push_back(status_string.c_str());