Add support for grpc_set_header

internal/ingress/controller/controller.go

@@ -426,7 +426,6 @@ func (n *NGINXController) getBackendServers(ingresses []*extensions.Ingress) ([]
 						glog.V(3).Infof("replacing ingress rule %v/%v location %v upstream %v (%v)", ing.Namespace, ing.Name, loc.Path, ups.Name, loc.Backend)
 						loc.Backend = ups.Name
 						loc.IsDefBackend = false
-						loc.Backend = ups.Name
 						loc.Port = ups.Port
 						loc.Service = ups.Service
 						loc.Ingress = ing
@@ -521,7 +520,6 @@ func (n *NGINXController) getBackendServers(ingresses []*extensions.Ingress) ([]
 				if upstream.Name == location.Backend {
 					if len(upstream.Endpoints) == 0 {
 						glog.V(3).Infof("upstream %v does not have any active endpoints.", upstream.Name)
-						location.Backend = ""
 
 						// check if the location contains endpoints and a custom default backend
 						if location.DefaultBackend != nil {

internal/ingress/controller/template/template.go

@@ -152,6 +152,7 @@ var (
 		"buildAuthSignURL":            buildAuthSignURL,
 		"buildOpentracingLoad":        buildOpentracingLoad,
 		"buildOpentracing":            buildOpentracing,
+		"proxySetHeader":              proxySetHeader,
 	}
 )
 
@@ -895,3 +896,17 @@ func buildOpentracing(input interface{}) string {
 	buf.WriteString("\r\n")
 	return buf.String()
 }
+
+func proxySetHeader(loc interface{}) string {
+	location, ok := loc.(*ingress.Location)
+	if !ok {
+		glog.Errorf("expected a '*ingress.Location' type but %T was returned", loc)
+		return "proxy_set_header"
+	}
+
+	if location.GRPC {
+		return "grpc_set_header"
+	}
+
+	return "proxy_set_header"
+}