From a16daf109b58a6fbacb46a9f766f03739f74df50 Mon Sep 17 00:00:00 2001
From: Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com>
Date: Wed, 13 Apr 2016 00:36:59 +0900
Subject: [PATCH] nghttpx: Try next HTTP/1 backend address when connection
 cannot be made

---
 src/shrpx_http_downstream_connection.cc | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/shrpx_http_downstream_connection.cc b/src/shrpx_http_downstream_connection.cc
index e572feb2..1d067653 100644
--- a/src/shrpx_http_downstream_connection.cc
+++ b/src/shrpx_http_downstream_connection.cc
@@ -102,6 +102,17 @@ void connectcb(struct ev_loop *loop, ev_io *w, int revents) {
   auto upstream = downstream->get_upstream();
   auto handler = upstream->get_client_handler();
   if (dconn->connected() != 0) {
+    downstream->pop_downstream_connection();
+
+    auto ndconn = handler->get_downstream_connection(downstream);
+    if (ndconn) {
+      if (downstream->attach_downstream_connection(std::move(ndconn)) == 0) {
+        return;
+      }
+    }
+
+    downstream->set_request_state(Downstream::CONNECT_FAIL);
+
     if (upstream->on_downstream_abort_request(downstream, 503) != 0) {
       delete handler;
     }
@@ -1056,8 +1067,6 @@ int HttpDownstreamConnection::connected() {
 
     downstream_failure(addr_);
 
-    downstream_->set_request_state(Downstream::CONNECT_FAIL);
-
     return -1;
   }