feat(router): Support for WebSockets

Pass upgrade headers through the router to allow applications to
use WebSockets.

Fixes #1061

Author: johanneswuerbach

router/templates/nginx.conf

@@ -34,6 +34,11 @@ http {
     access_log /dev/stdout;
     error_log /dev/stdout;
 
+    map $http_upgrade $connection_upgrade {
+        default upgrade;
+        ''      close;
+    }
+
     ## start deis-controller
     {{ if .deis_controller_host }}
     upstream deis-controller {
@@ -80,6 +85,9 @@ http {
             proxy_connect_timeout       10s;
             proxy_send_timeout          1200s;
             proxy_read_timeout          1200s;
+            proxy_http_version          1.1;
+            proxy_set_header            Upgrade $http_upgrade;
+            proxy_set_header            Connection $connection_upgrade;
 
             proxy_next_upstream         error timeout http_502 http_503 http_504;